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RADIOHOBBYIST.ORG
High atop Parr’s Ridge in northern Carroll County, MD at about 800 ft elevation. October Total: 0.0″ Monday November 2, 2020 Snow flurries. November Total: 0.0″ BUILDING A SKY LOOP ANTENNA Hi Chris. I like loops too, but in the vertical plane in my case, suspended between 2 tall trees. Getting a rope high in the trees is the biggest challenge, keeping it there is the next challenge but I find it helps immensely to (a) use a complete loop of rope over the tree so you can pull the antenna connection up AND down as necessary e.g. to reconnect it if it breaks, and (b) use a SSB VS AM | RADIOHOBBYIST.ORG Previously, in Signal to Noise Ratios, I compared how the SNR affects the quality of the received signal, with some simulated recordings at various Signal to Noise Ratios.. I thought it would be interesting to also compare AM (Amplitude Modulation) vs SSB (Single Side Band) transmissions. While I’ve never been a huge fan of SSB (also referred to as Satan Side Band) for transmissions BUILDING AN RF NOISE GENERATOR FOR TESTING FILTERS It’s often handy to have an RF noise generator when testing various circuits, especially filters. I was working on a low pass filter for long wave, and wanted a way to measure the performance of the filter. HOW MANY WATTS DO YOU NEED? Keep talking sense like that and you’re liable to spoil the fun for a certain wascally wabbit who seems convinced 5-10 watts in glorious AM on the funny bands can produce an SIO=555 signal worldwide, day or night, regardless of inconvenient facts about physics, propagation, frequency, angle of radiation, etc.UHF PIRATES
UHF SATCOM refers to satellite repeaters that operate between 240 MHz and 270 MHz. To receive SATCOM, you need a receiver that can tune thefrequency range in
CONSTRUCTION OF A HELICAL ANTENNA FOR SATCOM LISTENING Previously I wrote about the various kinds of transmissions you can heard on the 250 MHz SATCOM satellites. While you can pick these up with a standard scanner antenna, reception is much better with a directional antenna.AN SDR FOR $17
Earlier, I wrote about the RTL2832U based USB TV tuner dongles that can be turned in an inexpensive Software Defined Radio (SDR).Please take a moment to read that for an overview of these insanely great (for the price) modules, if they’re new to you. I’ve since mounted the dongle in a small metal enclosure: GENERATING VGA VIDEO WITH VERILOG I’ve started work on an FPGA based Z80 computer. I wanted to generate the video in the FPGA as well, turns out VGA is fairly easyto generate.
SETTING UP OP25 SCANNER TRUNKING ON AN UBUNTU VIRTUAL After a multi day (week?) saga of trying to get op25 to run on a Raspberry Pi, I decided to give it a try on a linux virtual machine, and had much better results.RADIOHOBBYIST.ORG
High atop Parr’s Ridge in northern Carroll County, MD at about 800 ft elevation. October Total: 0.0″ Monday November 2, 2020 Snow flurries. November Total: 0.0″ BUILDING A SKY LOOP ANTENNA Hi Chris. I like loops too, but in the vertical plane in my case, suspended between 2 tall trees. Getting a rope high in the trees is the biggest challenge, keeping it there is the next challenge but I find it helps immensely to (a) use a complete loop of rope over the tree so you can pull the antenna connection up AND down as necessary e.g. to reconnect it if it breaks, and (b) use a SSB VS AM | RADIOHOBBYIST.ORG Previously, in Signal to Noise Ratios, I compared how the SNR affects the quality of the received signal, with some simulated recordings at various Signal to Noise Ratios.. I thought it would be interesting to also compare AM (Amplitude Modulation) vs SSB (Single Side Band) transmissions. While I’ve never been a huge fan of SSB (also referred to as Satan Side Band) for transmissions BUILDING AN RF NOISE GENERATOR FOR TESTING FILTERS It’s often handy to have an RF noise generator when testing various circuits, especially filters. I was working on a low pass filter for long wave, and wanted a way to measure the performance of the filter. HOW MANY WATTS DO YOU NEED? Keep talking sense like that and you’re liable to spoil the fun for a certain wascally wabbit who seems convinced 5-10 watts in glorious AM on the funny bands can produce an SIO=555 signal worldwide, day or night, regardless of inconvenient facts about physics, propagation, frequency, angle of radiation, etc.UHF PIRATES
UHF SATCOM refers to satellite repeaters that operate between 240 MHz and 270 MHz. To receive SATCOM, you need a receiver that can tune thefrequency range in
CONSTRUCTION OF A HELICAL ANTENNA FOR SATCOM LISTENING Previously I wrote about the various kinds of transmissions you can heard on the 250 MHz SATCOM satellites. While you can pick these up with a standard scanner antenna, reception is much better with a directional antenna.AN SDR FOR $17
Earlier, I wrote about the RTL2832U based USB TV tuner dongles that can be turned in an inexpensive Software Defined Radio (SDR).Please take a moment to read that for an overview of these insanely great (for the price) modules, if they’re new to you. I’ve since mounted the dongle in a small metal enclosure: GENERATING VGA VIDEO WITH VERILOG I’ve started work on an FPGA based Z80 computer. I wanted to generate the video in the FPGA as well, turns out VGA is fairly easyto generate.
SETTING UP OP25 SCANNER TRUNKING ON AN UBUNTU VIRTUAL After a multi day (week?) saga of trying to get op25 to run on a Raspberry Pi, I decided to give it a try on a linux virtual machine, and had much better results. CROSSED PARALLEL LOOP ANTENNA BUILD Update: While this post references the LZ1AQ preamp, the antenna no longer uses is, and is now a passive loop antenna. This is the antenna I was planning on building when I ordered the LZ1AQ amplifier (and then built the hula hoop antenna as a quick test of the amp).. There is some technical information on the antenna here, which I won’t repeat, but I’ll summarize the design:AN SDR FOR $17
Earlier, I wrote about the RTL2832U based USB TV tuner dongles that can be turned in an inexpensive Software Defined Radio (SDR).Please take a moment to read that for an overview of these insanely great (for the price) modules, if they’re new to you. I’ve since mounted the dongle in a small metal enclosure: ACTIVE HULA HOOP LOOP ANTENNA My primary HF antenna is a horizontal sky loop, with a perimeter of about 670 feet, I also have a 500 ft long beverage aimed toward Europe which is primarily used on the 48 meter band for Europirates.In addition I have a sloping folded dipole for the 43/48 meter CONSTRUCTION OF A HELICAL ANTENNA FOR SATCOM LISTENING Previously I wrote about the various kinds of transmissions you can heard on the 250 MHz SATCOM satellites. While you can pick these up with a standard scanner antenna, reception is much better with a directional antenna. A LOW PASS FILTER FOR LONGWAVE At last a filter built using cheap axial inductors. In theory it should reach -80dB at 800 kHz. My need was for a filter that would cut off above the MW band and I’ve built one using 10 uH inductors and 2n2 capacitors using the same construction technigue – but in a smaller diecast box that I had to hand. DECODING THE ENTIRE DGPS BAND AT ONCE DGPS stations transmit the difference between positions indicated by GPS satellite systems and the known fixed position of the station. This allows higher accuracy. GENERATING VGA VIDEO WITH VERILOG I’ve started work on an FPGA based Z80 computer. I wanted to generate the video in the FPGA as well, turns out VGA is fairly easyto generate.
SDRDX – SOFTWARE DEFINED RADIO (SDR) APP FOR MAC OS X Software Defined Radios (SDR) have revolutionized the HF radio monitoring hobby. While most of the SDR manufacturers only offer Windows versions of their SDR application software, there are many third party solutions for other operating systems. LISTENING TO PIRATE RADIO STATIONS FROM SOUTH AMERICA Looking for a new DX challenge? In addition to shortwave pirate stations in the USA, and Europe (Europirates as we call them), there’s a relatively new group of pirate radio stations being heard in North America, those from South America. RUNNING AN RTL SDR USB DONGLE ON YOUR MAC THE EASY WAY I’ve had a few of the RTL radio tuner dongles for a while. These are USB devices that were originally made for use as TV tuners overseas, but it turns out that you can access the I/Q data stream, and turn them into an SDR (Software Defined Radio).RADIOHOBBYIST.ORG
You’ll see that totals 45 lines, leaving 480 lines of actual video. Each video line has 800 pixels (as far as timing is concerned). There’s a front porch of 16 pixels, 96 pixels of horizontal sync, 48 pixels of a back porch, then 640 pixels of actual video content. At a 200 MHz clock, each pixel is 8 clock cycles. BUILDING A SKY LOOP ANTENNA Right now, the height varies between about 25 to 50 feet. As I mentioned at the beginning of this article, the SWR (and feedpoint impedance) of a large sky loop antenna is all over the place. If you think about it, for many SW bands, the antenna is several wavelengths long. In my case, the antenna is about 670 (206 meters) feet inperimeter.
UHF PIRATES
UHF Pirates – 250 MHz SATCOM Monitoring. UHF SATCOM refers to satellite repeaters that operate between 240 MHz and 270 MHz. To receive SATCOM, you need a receiver that can tune the frequency range in narrow FM (most modern scanners can do this). You also need an outside antenna, and possibly a LNA preamp. The satellites in questionare
WATERFALLS | RADIOHOBBYIST.ORG 0234 QRT I think. I ran the SDR recording files through my Carrier Sleuth app, and produced this high resolution waterfall of 1710 kHz. Click on the image to view it full sized. The pirate is the carrier around 1710.009 kHz that goes QRT around 0234 UTC. The carrier around1710.0025 kHz is
SSB VS AM | RADIOHOBBYIST.ORG Previously, in Signal to Noise Ratios, I compared how the SNR affects the quality of the received signal, with some simulated recordings at various Signal to Noise Ratios.. I thought it would be interesting to also compare AM (Amplitude Modulation) vs SSB (Single Side Band) transmissions. While I’ve never been a huge fan of SSB (also referred to as Satan Side Band) for transmissions BUILDING AN RF NOISE GENERATOR FOR TESTING FILTERS OK, back to the noise generator. The paint can lids are handy for prototyping RF circuits. You can built them dead bug style on the bottom side of the lid, test them out, then put them on the can for your RF shield, as shown below. The two connectors are a BNC jack for the RF output, as well as a standard DC power jack for the powersupply.
HOW MANY WATTS DO YOU NEED? Going from S8 to S7 is 3.1 dB, a power reduction to 0.49, or 29.4 watts. S7 to S6 is 3.2 dB, a factor of 0.48, or down to 14.1 watts. S6 to S5 is a factor of 1.8 dB, 0.66, or 9.3 watts. And finally S5 to S4 is 2.3 dB, a ratio of 0.59, or down to 5.5 watts. LISTENING TO PIRATE RADIO STATIONS FROM SOUTH AMERICA rcwradio@gmail.com. New to the scene is Radio Marcopolo on 6991 kHz. Marcopoloradio@hotmail.com. Also new to the scene is an as yet UNID pirate from South America on 6934.9 kHz. I have received them for several weeks now in the local evenings, usually starting around the 2300-0300 UTC window. They put in a respectable signal (relatively GUESS THE AMOUNT OF SNOW AT CASA DE SMOLINSKI For those who want to play the averages Snowfall here has ranged from about 3 or 4 inches, one of those winters many years ago, I forget which one, when we all got basically no snow - my kind of winter! to about 100 inches the winter of 2009-2010 (I don't have the exact figure, but my recollection matches the NWS snowfall map, three major blizzards plus some additional snow). Maps of SETTING UP OP25 SCANNER TRUNKING ON AN UBUNTU VIRTUAL After a multi day (week?) saga of trying to get op25 to run on a Raspberry Pi, I decided to give it a try on a linux virtual machine, and had much better results.RADIOHOBBYIST.ORG
You’ll see that totals 45 lines, leaving 480 lines of actual video. Each video line has 800 pixels (as far as timing is concerned). There’s a front porch of 16 pixels, 96 pixels of horizontal sync, 48 pixels of a back porch, then 640 pixels of actual video content. At a 200 MHz clock, each pixel is 8 clock cycles. BUILDING A SKY LOOP ANTENNA Right now, the height varies between about 25 to 50 feet. As I mentioned at the beginning of this article, the SWR (and feedpoint impedance) of a large sky loop antenna is all over the place. If you think about it, for many SW bands, the antenna is several wavelengths long. In my case, the antenna is about 670 (206 meters) feet inperimeter.
UHF PIRATES
UHF Pirates – 250 MHz SATCOM Monitoring. UHF SATCOM refers to satellite repeaters that operate between 240 MHz and 270 MHz. To receive SATCOM, you need a receiver that can tune the frequency range in narrow FM (most modern scanners can do this). You also need an outside antenna, and possibly a LNA preamp. The satellites in questionare
WATERFALLS | RADIOHOBBYIST.ORG 0234 QRT I think. I ran the SDR recording files through my Carrier Sleuth app, and produced this high resolution waterfall of 1710 kHz. Click on the image to view it full sized. The pirate is the carrier around 1710.009 kHz that goes QRT around 0234 UTC. The carrier around1710.0025 kHz is
SSB VS AM | RADIOHOBBYIST.ORG Previously, in Signal to Noise Ratios, I compared how the SNR affects the quality of the received signal, with some simulated recordings at various Signal to Noise Ratios.. I thought it would be interesting to also compare AM (Amplitude Modulation) vs SSB (Single Side Band) transmissions. While I’ve never been a huge fan of SSB (also referred to as Satan Side Band) for transmissions BUILDING AN RF NOISE GENERATOR FOR TESTING FILTERS OK, back to the noise generator. The paint can lids are handy for prototyping RF circuits. You can built them dead bug style on the bottom side of the lid, test them out, then put them on the can for your RF shield, as shown below. The two connectors are a BNC jack for the RF output, as well as a standard DC power jack for the powersupply.
HOW MANY WATTS DO YOU NEED? Going from S8 to S7 is 3.1 dB, a power reduction to 0.49, or 29.4 watts. S7 to S6 is 3.2 dB, a factor of 0.48, or down to 14.1 watts. S6 to S5 is a factor of 1.8 dB, 0.66, or 9.3 watts. And finally S5 to S4 is 2.3 dB, a ratio of 0.59, or down to 5.5 watts. LISTENING TO PIRATE RADIO STATIONS FROM SOUTH AMERICA rcwradio@gmail.com. New to the scene is Radio Marcopolo on 6991 kHz. Marcopoloradio@hotmail.com. Also new to the scene is an as yet UNID pirate from South America on 6934.9 kHz. I have received them for several weeks now in the local evenings, usually starting around the 2300-0300 UTC window. They put in a respectable signal (relatively GUESS THE AMOUNT OF SNOW AT CASA DE SMOLINSKI For those who want to play the averages Snowfall here has ranged from about 3 or 4 inches, one of those winters many years ago, I forget which one, when we all got basically no snow - my kind of winter! to about 100 inches the winter of 2009-2010 (I don't have the exact figure, but my recollection matches the NWS snowfall map, three major blizzards plus some additional snow). Maps of SETTING UP OP25 SCANNER TRUNKING ON AN UBUNTU VIRTUAL After a multi day (week?) saga of trying to get op25 to run on a Raspberry Pi, I decided to give it a try on a linux virtual machine, and had much better results. WATERFALLS | RADIOHOBBYIST.ORG 0234 QRT I think. I ran the SDR recording files through my Carrier Sleuth app, and produced this high resolution waterfall of 1710 kHz. Click on the image to view it full sized. The pirate is the carrier around 1710.009 kHz that goes QRT around 0234 UTC. The carrier around1710.0025 kHz is
GENERATING VGA VIDEO WITH VERILOG In a nutshell, for basic VGA you need a total of 5 digital output lines. One for horizontal sync, one for vertical, and one each for the red, green, and blue video signals. The RGB signals are actually analog, but for my purposes implemented as digital, either on or off.That allows a
SHORTWAVE PIRATE RADIO 2020 To gauge shortwave pirate radio activity in 2020, I analyzed the Shortwave Pirate loggings forum of the HF Underground (http://www.hfunderground.com).A computer MWDX | RADIOHOBBYIST.ORG To decode the transmission, tune your radio to a DGPS frequency. You can either tune directly to the frequency in CW mode, in which case you set the center frequency in this app to frequency of the tone produced by your radio in CW mode, usually close to 800 Hz, or use USB mode, tune 1 kHz low, and set the center frequency in the app to 1000Hz.
THE SKY LOOP ANTENNA The length or perimeter of a full wave loop antenna is 1005 feet divided by the frequency in MHz. So for 160 meters, say 1.9 MHz, it would be 1005 / 1.9 = 529 ft. The exact size of the loop may be important if you’re transmitting and want a reasonable SWR. For receiving only, it is not as critical, and the “bigger is better”rule usually
A LOW PASS FILTER FOR LONGWAVE At last a filter built using cheap axial inductors. In theory it should reach -80dB at 800 kHz. My need was for a filter that would cut off above the MW band and I’ve built one using 10 uH inductors and 2n2 capacitors using the same construction technigue – but in a smaller diecast box that I had to hand. LISTENING TO PIRATE RADIO STATIONS FROM SOUTH AMERICA rcwradio@gmail.com. New to the scene is Radio Marcopolo on 6991 kHz. Marcopoloradio@hotmail.com. Also new to the scene is an as yet UNID pirate from South America on 6934.9 kHz. I have received them for several weeks now in the local evenings, usually starting around the 2300-0300 UTC window. They put in a respectable signal (relatively PROJECT: EXTERMINATE YELLOW JACKETS As everyone who has experienced yellow jackets knows, these are extremely aggressive and downright hostile insects. While bees are generally peaceful and useful creatures, helping to pollinate, yellow jackets don’t pollinate, and are generally pure evil. My goal now every spring is to do my best to completely eradicate them from thearea.
Z80 EMULATION ON AN ARDUINO, PART 2 The goal of this project was to get MSBASIC running in an emulated Z80 processor on an Arduino, with no external hardware/componentsrequired.
AN SDR FOR $17
An SDR for $17 – The R820T USB RTL-SDR DVB-T Dongle – Part 2. Earlier, I wrote about the RTL2832U based USB TV tuner dongles that can be turned in an inexpensive Software Defined Radio (SDR). Please take a moment to read that for an overview of these insanelyRADIOHOBBYIST.ORG
You’ll see that totals 45 lines, leaving 480 lines of actual video. Each video line has 800 pixels (as far as timing is concerned). There’s a front porch of 16 pixels, 96 pixels of horizontal sync, 48 pixels of a back porch, then 640 pixels of actual video content. At a 200 MHz clock, each pixel is 8 clock cycles. BUILDING A SKY LOOP ANTENNA Right now, the height varies between about 25 to 50 feet. As I mentioned at the beginning of this article, the SWR (and feedpoint impedance) of a large sky loop antenna is all over the place. If you think about it, for many SW bands, the antenna is several wavelengths long. In my case, the antenna is about 670 (206 meters) feet inperimeter.
UHF PIRATES
UHF Pirates – 250 MHz SATCOM Monitoring. UHF SATCOM refers to satellite repeaters that operate between 240 MHz and 270 MHz. To receive SATCOM, you need a receiver that can tune the frequency range in narrow FM (most modern scanners can do this). You also need an outside antenna, and possibly a LNA preamp. The satellites in questionare
WATERFALLS | RADIOHOBBYIST.ORG 0234 QRT I think. I ran the SDR recording files through my Carrier Sleuth app, and produced this high resolution waterfall of 1710 kHz. Click on the image to view it full sized. The pirate is the carrier around 1710.009 kHz that goes QRT around 0234 UTC. The carrier around1710.0025 kHz is
SSB VS AM | RADIOHOBBYIST.ORG Previously, in Signal to Noise Ratios, I compared how the SNR affects the quality of the received signal, with some simulated recordings at various Signal to Noise Ratios.. I thought it would be interesting to also compare AM (Amplitude Modulation) vs SSB (Single Side Band) transmissions. While I’ve never been a huge fan of SSB (also referred to as Satan Side Band) for transmissions BUILDING AN RF NOISE GENERATOR FOR TESTING FILTERS OK, back to the noise generator. The paint can lids are handy for prototyping RF circuits. You can built them dead bug style on the bottom side of the lid, test them out, then put them on the can for your RF shield, as shown below. The two connectors are a BNC jack for the RF output, as well as a standard DC power jack for the powersupply.
HOW MANY WATTS DO YOU NEED? Going from S8 to S7 is 3.1 dB, a power reduction to 0.49, or 29.4 watts. S7 to S6 is 3.2 dB, a factor of 0.48, or down to 14.1 watts. S6 to S5 is a factor of 1.8 dB, 0.66, or 9.3 watts. And finally S5 to S4 is 2.3 dB, a ratio of 0.59, or down to 5.5 watts. LISTENING TO PIRATE RADIO STATIONS FROM SOUTH AMERICA rcwradio@gmail.com. New to the scene is Radio Marcopolo on 6991 kHz. Marcopoloradio@hotmail.com. Also new to the scene is an as yet UNID pirate from South America on 6934.9 kHz. I have received them for several weeks now in the local evenings, usually starting around the 2300-0300 UTC window. They put in a respectable signal (relatively GUESS THE AMOUNT OF SNOW AT CASA DE SMOLINSKI For those who want to play the averages Snowfall here has ranged from about 3 or 4 inches, one of those winters many years ago, I forget which one, when we all got basically no snow - my kind of winter! to about 100 inches the winter of 2009-2010 (I don't have the exact figure, but my recollection matches the NWS snowfall map, three major blizzards plus some additional snow). Maps of SETTING UP OP25 SCANNER TRUNKING ON AN UBUNTU VIRTUAL After a multi day (week?) saga of trying to get op25 to run on a Raspberry Pi, I decided to give it a try on a linux virtual machine, and had much better results.RADIOHOBBYIST.ORG
You’ll see that totals 45 lines, leaving 480 lines of actual video. Each video line has 800 pixels (as far as timing is concerned). There’s a front porch of 16 pixels, 96 pixels of horizontal sync, 48 pixels of a back porch, then 640 pixels of actual video content. At a 200 MHz clock, each pixel is 8 clock cycles. BUILDING A SKY LOOP ANTENNA Right now, the height varies between about 25 to 50 feet. As I mentioned at the beginning of this article, the SWR (and feedpoint impedance) of a large sky loop antenna is all over the place. If you think about it, for many SW bands, the antenna is several wavelengths long. In my case, the antenna is about 670 (206 meters) feet inperimeter.
UHF PIRATES
UHF Pirates – 250 MHz SATCOM Monitoring. UHF SATCOM refers to satellite repeaters that operate between 240 MHz and 270 MHz. To receive SATCOM, you need a receiver that can tune the frequency range in narrow FM (most modern scanners can do this). You also need an outside antenna, and possibly a LNA preamp. The satellites in questionare
WATERFALLS | RADIOHOBBYIST.ORG 0234 QRT I think. I ran the SDR recording files through my Carrier Sleuth app, and produced this high resolution waterfall of 1710 kHz. Click on the image to view it full sized. The pirate is the carrier around 1710.009 kHz that goes QRT around 0234 UTC. The carrier around1710.0025 kHz is
SSB VS AM | RADIOHOBBYIST.ORG Previously, in Signal to Noise Ratios, I compared how the SNR affects the quality of the received signal, with some simulated recordings at various Signal to Noise Ratios.. I thought it would be interesting to also compare AM (Amplitude Modulation) vs SSB (Single Side Band) transmissions. While I’ve never been a huge fan of SSB (also referred to as Satan Side Band) for transmissions BUILDING AN RF NOISE GENERATOR FOR TESTING FILTERS OK, back to the noise generator. The paint can lids are handy for prototyping RF circuits. You can built them dead bug style on the bottom side of the lid, test them out, then put them on the can for your RF shield, as shown below. The two connectors are a BNC jack for the RF output, as well as a standard DC power jack for the powersupply.
HOW MANY WATTS DO YOU NEED? Going from S8 to S7 is 3.1 dB, a power reduction to 0.49, or 29.4 watts. S7 to S6 is 3.2 dB, a factor of 0.48, or down to 14.1 watts. S6 to S5 is a factor of 1.8 dB, 0.66, or 9.3 watts. And finally S5 to S4 is 2.3 dB, a ratio of 0.59, or down to 5.5 watts. LISTENING TO PIRATE RADIO STATIONS FROM SOUTH AMERICA rcwradio@gmail.com. New to the scene is Radio Marcopolo on 6991 kHz. Marcopoloradio@hotmail.com. Also new to the scene is an as yet UNID pirate from South America on 6934.9 kHz. I have received them for several weeks now in the local evenings, usually starting around the 2300-0300 UTC window. They put in a respectable signal (relatively GUESS THE AMOUNT OF SNOW AT CASA DE SMOLINSKI For those who want to play the averages Snowfall here has ranged from about 3 or 4 inches, one of those winters many years ago, I forget which one, when we all got basically no snow - my kind of winter! to about 100 inches the winter of 2009-2010 (I don't have the exact figure, but my recollection matches the NWS snowfall map, three major blizzards plus some additional snow). Maps of SETTING UP OP25 SCANNER TRUNKING ON AN UBUNTU VIRTUAL After a multi day (week?) saga of trying to get op25 to run on a Raspberry Pi, I decided to give it a try on a linux virtual machine, and had much better results. WATERFALLS | RADIOHOBBYIST.ORG 0234 QRT I think. I ran the SDR recording files through my Carrier Sleuth app, and produced this high resolution waterfall of 1710 kHz. Click on the image to view it full sized. The pirate is the carrier around 1710.009 kHz that goes QRT around 0234 UTC. The carrier around1710.0025 kHz is
GENERATING VGA VIDEO WITH VERILOG In a nutshell, for basic VGA you need a total of 5 digital output lines. One for horizontal sync, one for vertical, and one each for the red, green, and blue video signals. The RGB signals are actually analog, but for my purposes implemented as digital, either on or off.That allows a
SHORTWAVE PIRATE RADIO 2020 To gauge shortwave pirate radio activity in 2020, I analyzed the Shortwave Pirate loggings forum of the HF Underground (http://www.hfunderground.com).A computer MWDX | RADIOHOBBYIST.ORG To decode the transmission, tune your radio to a DGPS frequency. You can either tune directly to the frequency in CW mode, in which case you set the center frequency in this app to frequency of the tone produced by your radio in CW mode, usually close to 800 Hz, or use USB mode, tune 1 kHz low, and set the center frequency in the app to 1000Hz.
THE SKY LOOP ANTENNA The length or perimeter of a full wave loop antenna is 1005 feet divided by the frequency in MHz. So for 160 meters, say 1.9 MHz, it would be 1005 / 1.9 = 529 ft. The exact size of the loop may be important if you’re transmitting and want a reasonable SWR. For receiving only, it is not as critical, and the “bigger is better”rule usually
A LOW PASS FILTER FOR LONGWAVE At last a filter built using cheap axial inductors. In theory it should reach -80dB at 800 kHz. My need was for a filter that would cut off above the MW band and I’ve built one using 10 uH inductors and 2n2 capacitors using the same construction technigue – but in a smaller diecast box that I had to hand. LISTENING TO PIRATE RADIO STATIONS FROM SOUTH AMERICA rcwradio@gmail.com. New to the scene is Radio Marcopolo on 6991 kHz. Marcopoloradio@hotmail.com. Also new to the scene is an as yet UNID pirate from South America on 6934.9 kHz. I have received them for several weeks now in the local evenings, usually starting around the 2300-0300 UTC window. They put in a respectable signal (relatively PROJECT: EXTERMINATE YELLOW JACKETS As everyone who has experienced yellow jackets knows, these are extremely aggressive and downright hostile insects. While bees are generally peaceful and useful creatures, helping to pollinate, yellow jackets don’t pollinate, and are generally pure evil. My goal now every spring is to do my best to completely eradicate them from thearea.
Z80 EMULATION ON AN ARDUINO, PART 2 The goal of this project was to get MSBASIC running in an emulated Z80 processor on an Arduino, with no external hardware/componentsrequired.
AN SDR FOR $17
An SDR for $17 – The R820T USB RTL-SDR DVB-T Dongle – Part 2. Earlier, I wrote about the RTL2832U based USB TV tuner dongles that can be turned in an inexpensive Software Defined Radio (SDR). Please take a moment to read that for an overview of these insanelyRADIOHOBBYIST.ORG
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SETTING UP OP25 SCANNER TRUNKING ON AN UBUNTU VIRTUAL MACHINE Posted on January 21, 2019by Chris Smolinski
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HELLSCHREIBER
iPhone/iPad/iPod app to send and receive Hellschreiber After a multi day (week?) saga of trying to get op25 to run on a Raspberry Pi, I decided to give it a try on a linux virtual machine, and had much better results. For the radio hardware I used one of the ubiquitous RTL SDR Dongles. https://www.amazon.com/gp/product/B0129EBDS2/ref=ox_sc_act_title_1?tag=blackcatsyste-20 I used this guide as a reference / starting point: https://www.hagensieker.com/wordpress/2018/07/17/op25-for-dummies/ Here’s what I did to get things running: I’m using VirtualBox for the VM setup. I did it on macOS, it should work the same way under Windows. Create a new linux VM. I gave it 8G of RAM (perhaps overkill) and a30G volume.
Download the Ububtu installation ISO: https://www.ubuntu.com/download/desktop Go to Settings -> Storage for the new VM, select the ISO as theoptical disc image.
Boot the VM, and install. I won’t go into the installation details, in general I found the defaults worked fine. I installed the Guest Additions so I could cut and paste between theOS and VM.
Next I installed gqrx so I could check out that the RTL Dongle was working. The stock Ububtu I installed did not come with it: sudo apt install gqrx-sdr I plugged in the RTL Dongle, went to Devices -> USB in the VM menu, and assigned the dongle to the VM for use. (Don’t forget this step!) I ran gqrx, and verified the dongle was working.gqrx
Next, before installing op25, I had to install git: sudo apt install gitThen grab op25:
git clone https://github.com/boatbod/op25.git Switch to the op25 directory that was just created:cd op25
And install it:
./install.sh
Then install gnuplot so you can see the spectrum and constellationplots:
sudo apt-get install gnuplot-x11 Go to the apps directory for op25: cd op25/gr-op25_repeater/apps Next you need to go to https://www.radioreference.com/ and locate the details on the trunking system for your area. Several control frequencies may be listed for your system, you need to find the currently active one. In my case, I checked them all until I found one frequency that was continuously transmitting, 852.9375 MHz. Now, the next part was perhaps the most difficult, you need to determine the correct ppm error for your RTL dongle. All dongles seem to be off, some more than others. Mine turned out to be off by a LOT. The other tutorials I read gave examples with ppm errors of around 2 or 3. I spent a lot of time trying small values like that, and even up to 20 or 30, without success. I brought up the spectrum plot in op25 (hit the 1 key) and looked at the spikes, representing transmissions, and checked them against my R-7000 receiver. It was confusing at first, trying to match things up. I eventually realized my dongle was off by a huge factor – about 150 kHz at 853 MHz. I ended up using a ppm value of 173, and that seems to be working. Your value will likely be different, but carefully use the spectrum plot to determine what it is, or at least get close. Then you can iterate up and down by 1 ppm. Another recommendation I read, and used, was to set the offset (used to avoid the 0 Hz spike) to zero forinitial testing.
Here’s the command to run op25 with a control frequency of 852.9375 MHz, ppm of 172, and an offset of 0 Hz: ./rx.py –args ‘rtl’ -N ‘LNA:47’ -S 2400000 -f 852.9375e6 -o0 -q 172
I found I still need to use the , and . keys to shift the received frequency offset around until the program started to decode data correctly (the tsbks value will start incrementing). Again I used thespectrum plot to
help center the control frequency. When properly tuned, the constellation plot looks like this, hit the 2key to bring it up:
Once that worked, the next step was to find the NAC value, which is displayed in the op25 program, in my case it was 0x661. In the apps directory, open the trunk.tsv file in the LibreOffice editor built into Ubuntu, it opens as a spreadsheet. I edited it as follows, entering in a system name, setting the control channel and NAC values. I left the modulation alone (CQPSK) and entered a new tags file name, we’ll create that file next. I then duplicated the tompkins.tsv file, renamed the duplicate carroll.csv to match what I entered in trunk.tsv, and then opened itin LibreOffice.
It’s a bit tedious, but you have to enter in each talkgroup tag number and name. I just went down the list of talkgroups in radio reference, and it took a few minutes. Part of the list: Once that was done, I ran op25 again. You can append 2> followed by a filename, to route error messages to a file, so they do not clutterthe screen:
./rx.py --args 'rtl' -N 'LNA:47' -S 2400000 -o 25000 -q 181 -T trunk.tsv -V -2 -U 2> stderr.2 I am using an offset of 25 kHz (25000 Hz), and notice I now had to change the ppm to -181, the RTL dongle drifted that much in a fewhours!
Update, I also got it working with the AirSpy, which turned out to be very easy. I just had to install the AirSpy support with: sudo apt install airspy Running it is as easy as: ./rx.py --args "airspy" -q 3 -N 'IF:12,MIX:12,LNA:12' -S 2500000 -V -2-U -T trunk.tsv
As you can see, the AirSpy is much more accurate, the ppm value isonly 3.
I still need to optimize the gain settings, but this is working nicely. Much better reception than the RTL dongle, as you can imagine. Hmm… unfortunately, op25 is freezing after a while with the AirSpy. Need to investigate this…Another update:
I decided to install Ububtu on an older i3 laptop. I resized the Windows 10 drive, and freed up 200GB (perhaps excessive, but the drive is 750GB, and I don’t really use the laptop much anymore for Windows) for the linux partition. I followed the above steps and got gqrx running first, then op25. I have not tried with the AirSpy yet, but even with the RTL dongle, things are improved, the audio quality and overall reception arenoticeably better.
Posted in SDR , Software, VHF/UHF
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WINTER 2018-2019 SNOWFALL Posted on October 23, 2018by Chris Smolinski
1
FIELD STRENGTH CALC
Determine the received strength of a transmitted signal HIGH ATOP PARR’S RIDGE IN NORTHERN CARROLL COUNTY, MD AT ABOUT 800FT ELEVATION.
CONTEST!
Guess The Amount of Snow At Casa De Smolinski (and DCA/BWI/IAD) SEASONAL SNOWFALL CONTEST ENTRIESTSMagnum 26.9
Groveton 28.8
Snowbrow 35.2
mjbuffettfan 38
BigCountry 42.2
beadalou 42.3
Terpiecat 42.7
Xtrain21 44.4
ck5416 45.1
taylort2 45.8
(no name) 47.2
cdklktr 47.5
alrob8 48.3
Sneakyfeets 48.5
SSB 51.3
Sarandipity885 53.4eric654 54.5
gelezinis vilkas 56.7 83worldtraveler 58.7 Kate commenting 59.3asimovian 61.3
nomini 63.2
parksndc 64.7
I Love Terpiecat 65.0cameraman 65.4
Snownomore 69.9
Autumn_Forge 67.3 chrisofthebeagles 71.9Rex Block 73.3
Merry Mildest 75.0 walter-in-fallschurch 75.1WBsnowchic 77
surewhynot 79
speedo311yo 88.0
PBH 88
Scrabble Girl 98.6 Chris Smolinski 100.0 The Adorable Miniature Snowplows 101Mean: 61.0
Median: 59.3
(No, I can’t win my own contest, I thought it would to fun to add my own guess, which is just the approximate total snowfall the last time we had a solar minimum winter) OCTOBER TOTAL: 0.0″ THURSDAY NOVEMBER 15, 2018 – FRIDAY NOVEMBER 16, 2018: 7.0″ of heavy snow on the 15th. An additional 1.25″ of snow measured early on the morning of the 16th, which fell overnight WEDNESDAY NOVEMBER 28, 2018 Snow flurries. No accumulation. NOVEMBER TOTAL: 8.25″ DECEMBER TOTAL: 0.0″ WEDNESDAY JANUARY 9, 2019 – THURSDAY JANUARY 10, 2019A dusting of snow.
SATURDAY JANUARY 12, 2019 – SUNDAY JANUARY 13, 20192.5″ of snow
THURSDAY JANUARY 17, 2019 – FRIDAY JANUARY 18, 20191.5″ of snow
SATURDAY JANUARY 19, 2019 0.5″ of snow,then sleet, then rain. FRIDAY JANUARY 25, 2019 Morning snow flurries. TUESDAY JANUARY 29, 2019 3.5″ of fairly heavy snow. WEDNESDAY JANUARY 30, 2019 0.4″ from a snow squall. JANUARY TOTAL: 8.4″ FRIDAY FEBRUARY 1, 20192.0″ of dry snow.
MONDAY FEBRUARY 11, 2019 – TUESDAY FEBRUARY 12, 2019 5.5″ snow, ending as sleet and rain. SUNDAY FEBRUARY 17, 2019 – MONDAY FEBRUARY 18, 2019 Glaze of freezing rain. WEDNESDAY FEBRUARY 20, 2019 4.5″ of wet snow, followed by some freezing mist. About 0.1″ icebuild up on trees.
FEBRUARY TOTAL: 12.0″ FRIDAY MARCH 1, 20192.9″ of snow.
SATURDAY MARCH 2, 2019 1.5″ of wet snow, also some rain and sleet. SUNDAY MARCH 3, 2019 4.75″ of heavy snow. MARCH TOTAL: 9.15″ 2018-2019 SEASON TO DATE TOTAL: 37.8″Previous seasons:
Winter 2017-2018 34.1″ Winter 2016-2017 22.9″ Winter 2015-2016 43.7″ Winter 2014-2015 44.7″ Winter 2013-2014 78.0″ Winter 2009-2010: No details, but the seasonal total was about 100″ with three major blizzards. Posted in Weather | 1Reply
VARIATION IN PRECIPITATION AT DULLES INTERNATIONAL AIRPORT (IAD)1964-2017
Posted on July 27, 2018by Chris Smolinski
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MULTIMODE
CW RTTY SSTV PSK31 ACARS FAX SITOR App For the Mac Previously I wrote about the variation In precipitation At Washington Reagan National Airport (DCA) and Baltimore Washington International Airport (BWI) to see if there was a significant change over the years due to Climate Change, and now it’s time to look at Dulles International Airport. The IAD dataset starts later than that for DCA and BWI, and starts from April 1, 1960. As with the DCA and BWI data, there appear to be a few days with missing data, as for some years there is only data for 364 days. The actual number of days per year of data was taken into account when computing means. Also, large amounts of data are not available for various dates 1960 through 1963, and of course there is no data for the remainder of 2018. So the plots are from 1964 through2017.
Each of the graphs can be clicked to be viewed full size. The first graph is the average daily precipitation. This is total amount of rain per year divided by the number of days in the year. This graph shows a slight increase, from 0.110 to 0.115 inches perday:
Next is a graph of the number of days per year with precipitation, followed by its inverse, the number of days without. The number of days with precipitation has increased from about 114 to 121, or 6 more days. The increases at DCA and BWI were 5 days, and they was over a larger number years. It currently rains about 115 days per year at DCA, and 118 days per year at BWI. This leads to the next graph, the average rainfall on days when it actually rained. There is no apparent change at all – this graph is flat. So while it rains about 6 more days a year at IAD, the amount of rain, on days when it does rain, is the same. Actually if you squint, it looks like it might be very so slightly decreasing, but it is subtle. And probably going to be different once you add in another year’s worth of data. Next, we can look at the standard deviation in rainfall amounts on days when it rains, standard deviation is amount of variation of a set of data values around the mean (average). My previous posthas a link for more
information about standard deviation, as well as the best standard deviation joke for math nerds. The standard deviation rose from about 0.48 to 0.50, about half the increase seen at BWI. By comparison, the standard deviation was unchanged at DCA. If you torture the data enough, you can find possible reasons for the change. I notice there was a step change / increase in the standard deviation from 2005-2014, which seems to have since stopped. You can also spot a period in the 1990s when the standard deviation was low. I am sure 20 people can find 20 more possible reasons. It’s like a Rorschach test for meteorologists. Here’s the standard deviation plot: Finally, we can look at the number of days that rained and had rainfall over two standard deviations (using the standard deviation for that year), treating this as significant or extreme rainfall events. The trend of this is completely flat: To summarize the analysis of rainfall events at DCA, BWI, and IAD: * The number of days with rain is increasing, 5 or 6 more days per year, over the last half century or more, at all three airports. * The average annual measured rainfall is either decreasing (DCA) or increasing (BWI, IAD), depending on which station you look at. * The average amount of rain on days when it does rain is either decreasing (DCA), increasing (BWI) or exactly the same (IAD). * The number of days with significantly high rainfall, exceeding two standard deviations, is either very slightly increasing (BWI) or unchanged (DCA, IAD), depending on which airport you look at. Posted in Weather |Leave a reply
VARIATION IN PRECIPITATION AT BALTIMORE WASHINGTON INTERNATIONAL AIRPORT (BWI) 1937-2018 Posted on July 25, 2018by Chris Smolinski
1
MULTIMODE
CW RTTY SSTV PSK31 ACARS FAX SITOR App For the Mac Previously I wrote about the Variation In Precipitation At Washington Reagan National Airport (DCA) 1945-2018 to see if there was a significant change over the years due to Climate Change, and now it’s time to look at BWI Airport. The BWI dataset starts earlier than tat for DCA, and runs from July 1, 1937 to July 18, 2018. As with the DCA data, there appear to be a few days with missing data, as for some years there is only data for 364 days. The actual number of days per year of data was taken into account when computing means. Also, some data is not plotted for 1945 or 2018, namely the number of days with/without rain for those years, as a full year of data is not available. Each of the graphs can be clicked to be viewed full size. The first graph is the average daily precipitation. This is total amount of rain per year divided by the number of days. It shows an increase from roughly 0.108 to 0.121 inches per day from 1939 to 2018. That’s an increase of about 12%. Next is a graph of the number of days per year with precipitation, followed by its inverse, the number of days without. The number of days with precipitation has increased from about 113 to 118, or 5 more days. This is the same increase we saw at DCA, although it seems rain about 3 fewer days per year at DCA vs BWI (You picked the right airport to leave near, Walter): That leads to the next graph, the average rainfall on days when it actually rained. This shows an increase from about 0.35 inches to 0.37 inches. (The trend at DCA was actually negative, from 0.37 to 0.35 inches in fact. Exactly opposite. Hmm…): Next, we can look at the standard deviation in rainfall amounts on days when it rains, standard deviation is amount of variation of a set of data values around the mean (average). My previous posthas a link for more
information about standard deviation, as well as the best standard deviation joke for math nerds. The standard deviation in rainfall amounts at BWI is increasing. Looking at the graph, the increase seems to be mostly due to an increase during the 2005-2015 period, which has since ended. Is it a short term variation due to random processes, or part of a long term shift? Next we can look at the number of days that rained and had rainfall over two standard deviations (using the standard deviation for that year), treating this as significant or extreme rainfall events. The trend of this is completely flat: But, you might ask, isn’t the standard deviation slightly increasing each year? What if we use a fixed standard deviation value, like 0.50 which seems to be the mean value? Doing that, you do see an increase from about 9 to 11 days per year: Next up… Dulles Airport (which unfortunately has the shortest dataset of all three major airports) Posted in Weather | 1Reply
VARIATION IN PRECIPITATION AT WASHINGTON REAGAN NATIONAL AIRPORT (DCA)1945-2018
Posted on July 22, 2018by Chris Smolinski
3
IFUNCTIONGENERATOR
Turn your iPhone or iPod Touch into an audio function generator Recently the weather, at least precipitation wise, in the DCA area has been variable. It was very wet and rainy, then we had dry conditions for several weeks with essentially no rain. Now, it is very wet again. Are we seeing extreme (some may say historic) changes in the weather? Or are these just the usual variations? Are rainfall events are becoming less common, but more extreme? That is, it rains less often, but we get more rain when it does rain, rather than getting rainfall spread out evenly over time as it used to be. And maybe we’re getting more rain overall. Or possibly less rain, those two claims seems to depend on recent weather memory. To check this claim, data for Washington Reagan National Airport (DCA) was downloaded from the NOAA NCDC site and analyzed in several ways. You can download this data yourself, if you wish: https://www.ncdc.noaa.gov/cdo-web/ The dataset runs from July 1, 1945 to July 18, 2018. There appear to be a few days with missing data, as for some years there is only data for 364 days. The actual number of days per year of data was taken into account when computing means. Also, some data is not plotted for 1945 or 2018, namely the number of days with/without rain for those years, as a full year of data is not available. Each of the graphs can be clicked to be viewed full size. First, is there a significant long term trend in the amount of precipitation at DCA? No, there does not seem to be (if you squint you may see a very small decline over time, the sign of this slope likely changes from year to year with normal variability in rainfall): Second, are rain events becoming less common, but with higher rainfall totals from those events? That would mean we are seeing fewer days with rain, but more rain on those days. The following two graphs show the number of days without any rain, and the number of days with rain, defined as 0.01″ or more. First the number of days without rain. Which is not increasing, but actually decreasing: And the number of days per year with rain, which of course is just the inverse of the previous graph. It’s raining 5 or 6 more days per year (sorry, Walter): Third, what about the rainfall totals on days when it actually rains. Is that increasing, leading to more extreme rain events? No, it isn’t. It is actually decreasing, which makes sense considering the mean rainfall per year is essentially steady, and it is raining a few more days out of the year: OK, maybe it is mostly the same, but we’re getting a few more extreme rainfall events per year? Let’s look at the standard deviation of the rainfall amounts, again only for days when itactually rains.
Standard deviation is amount of variation of a set of data values around the mean (average), there is an explanation here: https://en.wikipedia.org/wiki/Standard_deviation If you get this joke, you understand standard deviation: “Yo mama is so mean she has no standard deviation” Hmm, no, that is also steady: One more thing, look at the number of days with very extreme rainfall. How about the number of days where the rainfall exceeded two standard deviations? That also seems to be flat: Anything else we can check to see if precipitation is indeed getting more extreme in Washington DC? So far, it doesn’t seem to be. Note, the purpose of this analysis was not to try and discredit man made climate change aka AGW, which is certainly real. Only to see if claims of a noticeable effect on the precipitation patterns in the DC area can be confirmed, which does not seem to be the case. Posted in Weather | 3Replies
PRIVACY POLICY
Posted on May 22, 2018by Chris Smolinski
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PSK31
iPad app to decode PSK31A. Introduction
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LISTENING TO PIRATE RADIO STATIONS FROM SOUTH AMERICA Posted on March 5, 2018by Chris Smolinski
2
SPECTRUM ANALYZER
Audio Spectrum Analyzer App for the iPad Looking for a new DX challenge? In addition to shortwave pirate stations in the USA, and Europe (Europirates as we call them), there’s a relatively new group of pirate radio stations being heard in North America, those from South America. It’s really only been the previous year that we’ve confirmed that there’s a significant number of pirate radio stations in South America that can be received here. Radio Pirana has been known for some time, and I believe thee were a few reports of it, and at least one other station that I cannot remember the name of, but that’s about it. For years there have been logs of very weak UNID stations heard on the 43 meter band (6800-7000 kHz), presumed to be pirates of some sort, and it is possible some of these were South Americanpirates.
Most of these stations use homemade transmitters, often of the “Lulu” design, with a IRF510 or similar MOSET RF final stage. That means they are generally in the 15 or 20 watt carrier range, although some are higher power. That also means that unless otherwise noted, all of these stations use AM mode, and in general the frequency is highly variable, easily varying 100 Hz or more from night to night, or even during transmissions. One important caveat: Since most of these stations use relatively low power, and due to the long distances involved, signal levels are generally weak, although occasionally when conditions are excellent (especially if there’s grayline propagation), they can put in stronger signals. I am fortunate to live in a rural area with relatively low noise/RFI levels, and have several high end receivers and large antennas. My primary setup for catching these stations is a netSDR receiver and a 670 foot Sky Loop antenna. You’re going to want to use the best receiver and antenna you can for catching these stations, you’re not likely to have good (or any) results with a portable SW radio, RTL dongle, or small/indoor antenna. Also, I record the entire 43 meter band nightly on my netSDR, and then go through the recordings each morning. This lets me catch stations that may only appear for a brief period of time. That said, you can still hear them with a reasonable HF setup, although it may take persistence, checking each night, until conditions permit reception. It’s well worth checking the Latin American Pirate logging forum on the HF Underground website, to see what is presently being heard. The HF Underground is the best way to keep up to date with the hobbyist radio scene in general, with dedicated forums for North American Pirates,
Europirates
, and
of course radio in general. And for those of you into collecting QSLs – many of these stations are reliable QSLers! In general, the easiest station to hear is Lupo Radio from Argentina. It is on the air most evenings on 6973 kHz in AM mode. At least at my location, it puts in the strongest and most reliable signal. Usually in the SIO 222 to 333 range, sometimes stronger. There are frequent IDs. I use Lupo Radio as a “beacon” to gauge how good conditions are to South America on 43 meters. luporadio@hotmail.com Another station that is often on the air is RCW – Radio Compañía Worldwide from Chile. They use 6925.13 kHz, and their carrier is more stable and usually on this offset frequency, which makes it easier to determine that it’s likely you’re hearing them vs a US piratestation.
rcwradio@gmail.com
New to the scene is Radio Marcopolo on 6991 kHz. Marcopoloradio@hotmail.com Also new to the scene is an as yet UNID pirate from South America on 6934.9 kHz. I have received them for several weeks now in the local evenings, usually starting around the 2300-0300 UTC window. They put in a respectable signal (relatively speaking), strong enough for Shazam to ID songs. They have frequent breaks in their transmission, with the carrier often going off and on many times during a broadcast. They also occasionally transmit audio test tones, and sometimes seem to relay audio from licensed stations in Argentina such as Radio El Mundo. This could be someone testing a new transmitter? A new mysteryto solve!
Radio Dontri is somewhat unique in that they use USB mode, on 6955 kHz. They also send SSTV, which is sometimes easier to receive than music, and helps to verify that you’re actually hearing them, vs a US pirate on 6955. They tend to drift a lot, however, which can make decoding the SSTV transmissions challenging. radiodontri@gmail.com Outside the 43 meter band, there is Rádio Casa 8000 kHz. I have only received weak carriers from this station, although partly that may be because I do not frequently check for it, and it does not turn up on my overnight SDR recordings. Radio Triunfal Evangélica is other station outside of the 43 meter band, they use the nominal frequency of 5825 kHz, often closer to 5824.9 kHz. Again I have only received a carrier from them. As the name implies, they are a religious station, affiliated with a church. Now that we’ve talked about the pirate stations from South America, we should probably mention things you are likely to hear that are NOT pirates. Specifically, what we call Peskies (or Pesky as the singular), short for pescadores, the Spanish word for fishermen. Peskies generally use LSB mode, and can be heard on many frequencies in the 43 meter band, engaging in QSOs. Years ago, pirate listeners started to call these stations pescadores, since some of them were indeed fishermen, and could be heard discussing related matters. It might be better to think of most of them as freebanders/outbanders, much in the tradition of those transmitting on 11 meters. There’s a logging forum on the HFU dedicated to Peskies, if
you’re interesting in learning more about them. Occasionally they use AM mode. We’ve logged several on 6965 kHz (+/- of course), that at first were thought to be pirates. But they never transmitted music, and after some discussions with DXers in South America, it was determined that they were more properly consideredpeskies.
Posted in Pirate Radio |2 Replies
VATICAN RADIO EQSL
Posted on March 1, 2018by Chris Smolinski
Reply
ISOUNDEX
iPhone app generate American and Daitch-Mokotoff Soundex Codes Received in 45 days for a report emailed to promo@vatiradio.va Posted in QSL cards |Leave a reply
AN UNID PIRATE STATION ON 1710 KHZ Posted on February 7, 2018by Chris Smolinski
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CLIKTRAK
Customizable Tally Counter for iPhone/iPad Several pirate stations use 1710 kHz, but reception here is difficult, due to the Hudson County NJ TIS station, which puts in a strong signal. It’s an annoying pest, and seems to just play the same 3 or 4 pre-recorded messages over and over. I doubt anyone in Hudson County actually listens to it. Last night, I started to hear some music on 1710 around 2350 UTC (6 February 2018), so I decided to stick around and listen. I also started the SDR recording. Glad I did! The station was fading in and out, so my reception was alternatingwith the TIS.
Here’s what I heard. Some songs were ID’d with Shazam, so they could be iffy, plus there could be another station in there: 2352 Eagles “What Do I Do With My Heart”. 2356 “Green Hornet Theme” 0002 Neil Diamond “Stones” 0005 “You Only Live Twice” 0042 Oliva Newton John “Let Me Be There”0044 Country song?
0047 Johnny Mathis “Wonderful! Wonderful!” 0052 The New Seekers “Look What They’ve Done To My Song Ma” 0055 Jose Feliciano “High Heel Sneakers” 0057 Jewel “Standing Still” 0106 Donna Summer “Macarthur Park” 0109 Elvis “Don’t Be Cruel” 0112 “Wiggle Wobble” 0114 Conway Twitty “Hello Darlin” 0117 Colbie Caillat “Realize” 0121 Howard Jones “No One Is To Blame” 0125 “Heart Of Gold” 0128 “Little Bit O’ Soul” 0130 “As Time Goes By” 0133 “Ahab The Arab” 0148 “How Do You Do It?” 0150 “Nobody But Me” 0203 “Bittersweet” 0210 “Cinnamon Girl” 0217 “It Might Be You” 0221 “Baby, I’m Yours”0223 “Sara”
0227 “Freaky Behavior”0234 QRT I think.
I ran the SDR recording files through my Carrier Sleuth app, and produced this high resolution waterfall of 1710 kHz. Click on the image to view it full sized. The pirate is the carrier around 1710.009 kHz that goes QRT around 0234 UTC. The carrier around 1710.0025 kHz is the Hudson County TIS. I think one of the carriers is another TIS in PA, I heard a mention of an address in PA at one point. Probably KID-761, Bedford, PA, theFlight 93 Memorial.
Look at all the other carriers on 1710! One is probably the Springfield MA TIS, others may be pirates? I am not sure how many other TIS stations are authorized on 1710. It’s very interesting how there is another carrier around 1709.995 kHz that went QRT the same time as the pirate. It is weaker, and does not have the same wiggles as the pirate carrier, so I do not think it is a locally produced image. I am not sure what it is, or if the sign off time is coincidental. If the operator of the 1710 pirate sees this post, and would like to send me a QSL / eQSL, it would be greatly appreciated! Posted in Pirate Radio , Waterfalls | Leave areply
KITCHENAID MIXER QRM Posted on February 6, 2018by Chris Smolinski
Reply
NAVTEX
iPhone/iPad/iPod app to decode NAVTEX marine transmissions I discovered a new QRM / RFI source today, my wife’s new KitchenAid 7-Quart Pro Line Stand Mixer. Here’s a waterfall screenshot after it turned on, you can see the roughly 15 kHz spaced bands of interference. These use a DC motor, presumably that is the cause of the RFI, vs mixers with a regular AC motor. Fortunately she doesn’t use it that often, and she’s testing out a new low carb dough recipe, so I can live with it. Speaking of low carb, here’s our low carb pizza recipe.
Posted in Antennas , Electronics , Shortwave, Waterfalls
| Leave a reply
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