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THE ZL2BMI DSB TRANSCEIVER The ZL2BMI DSB Transceiver – An Update. A couple of years ago (gosh – has it been that long?) I attempted to build the ZL2BMI DSB transceiver for 80M. It was an appealing design, being simple, and capable of being built into a compact space. Eric, the designer, had originally conceived it in the mid 1980’s as a very small rig to beused
THE SW200 – A BUDGET AM BROADCAST PROCESSOR FOR LPAM – AND Note that although the audio processor described in this article is intended primarily for Part 15 AM broadcasters, and perhaps also low power licensed AM broadcasters on a budget, it may also have applications for hams with their AM endeavors. I'm thinking of the AM enthusiasts on 160, 80, and 40. Some of them are ex-broadcast THE DSB80 – A DIRECT CONVERSION DSB TRANSCEIVER FOR 80M BY I was 19 years old in March 1983 when the UK magazine Ham Radio Today published the article "A Low Cost DSB/CW Transceiver for 80M". Being short of cash and wanting to get on the air, I sent away for the kit and soon after, was surfing the phone portion of the UK 80M band THE NA5N DESERT RATT 2 REGEN The toroid was fixed to the PCB with nylon nuts, bolts and washers that I got from my local Ace hardware store. Here are some pictures of my Desert Ratt 2 with the circuit finished –. The red wires running along the back of the front panel are the regulated 2.1V and 2.75Vlines.
TELESCOPIC FIBERGLASS MASTS According to Henry K4TMC, the proprietor of The Mast Co, this pole can support a lightweight HF dipole fed by RG8X (lightweight meaning made out of fairly light gauge wire with no traps). You can also support a small beam if you attach it part-way down the mast. This is a great all-purpose experimental antenna mast. THE NORCAL 2N2/40 CW TRANSCEIVER KIT For about 10 years, a lot of folk built these neat little transceivers manhattan style until the Norcal QRP Club came along to help those of us who still want to build things, but like to have them in the form of a ready-to-assemble kit. The Norcal 2N2/XX series of kits included a double-sided PCB and to many, this was just too good to resist. N0WVA’S ONE-FET REGEN OPTIMIZED FOR SSB/CW SOUNDS GREAT Schematic of N0WVA’s single-FET regen. It is a monobander on 75/80M. Note: Barry W6YE looked closely at the bandset trimcap in the photos below (the one marked in the schematic above as being 10pF) and discovered, using the part number visible in the picture, that it is a 7-45pF part. Thank you for this information Barry! DAVE RICHARDS AA7EEK3WWPMESQUARESSINGLE LEVER PADDLENAQCCG4JSTN0XAS When I built the VE7BPO DC Receiver Mainframe recently, it wasn’t intended to end up as a final finished project. The intention was more to have it as part of an experimental platform. The little box that contains the DBM, diplexer, and AF amplifier that make up the mainframe will most likely stay largely the Written by AA7EE. A PASSIVE TUNABLE HF PRESELECTOR A Passive Tunable HF Preselector. When I built the VE7BPO DC Receiver Mainframe recently, it wasn’t intended to end up as a final finished project. The intention was more to have it as part of an experimental platform. The little box that contains the DBM, diplexer, and AF amplifier that make up the mainframe will most likely stay largely the A SCRATCH-BUILD OF N6KR AND WILDERNESS RADIO’S SST FOR 20M Designed by Wayne N6KR in the late 90’s, appearing as a full article in QRPp, and a kit sold by Wilderness Radio, it ignited the imaginations of a whole generation of builders for it’s combination of simplicity, performance, and willingness to accept modifications cheerfully. The review from Adventure Radio Society was quitepositive.
THE ZL2BMI DSB TRANSCEIVER The ZL2BMI DSB Transceiver – An Update. A couple of years ago (gosh – has it been that long?) I attempted to build the ZL2BMI DSB transceiver for 80M. It was an appealing design, being simple, and capable of being built into a compact space. Eric, the designer, had originally conceived it in the mid 1980’s as a very small rig to beused
THE SW200 – A BUDGET AM BROADCAST PROCESSOR FOR LPAM – AND Note that although the audio processor described in this article is intended primarily for Part 15 AM broadcasters, and perhaps also low power licensed AM broadcasters on a budget, it may also have applications for hams with their AM endeavors. I'm thinking of the AM enthusiasts on 160, 80, and 40. Some of them are ex-broadcast THE DSB80 – A DIRECT CONVERSION DSB TRANSCEIVER FOR 80M BY I was 19 years old in March 1983 when the UK magazine Ham Radio Today published the article "A Low Cost DSB/CW Transceiver for 80M". Being short of cash and wanting to get on the air, I sent away for the kit and soon after, was surfing the phone portion of the UK 80M band THE NA5N DESERT RATT 2 REGEN The toroid was fixed to the PCB with nylon nuts, bolts and washers that I got from my local Ace hardware store. Here are some pictures of my Desert Ratt 2 with the circuit finished –. The red wires running along the back of the front panel are the regulated 2.1V and 2.75Vlines.
TELESCOPIC FIBERGLASS MASTS According to Henry K4TMC, the proprietor of The Mast Co, this pole can support a lightweight HF dipole fed by RG8X (lightweight meaning made out of fairly light gauge wire with no traps). You can also support a small beam if you attach it part-way down the mast. This is a great all-purpose experimental antenna mast. THE NORCAL 2N2/40 CW TRANSCEIVER KIT For about 10 years, a lot of folk built these neat little transceivers manhattan style until the Norcal QRP Club came along to help those of us who still want to build things, but like to have them in the form of a ready-to-assemble kit. The Norcal 2N2/XX series of kits included a double-sided PCB and to many, this was just too good to resist. N0WVA’S ONE-FET REGEN OPTIMIZED FOR SSB/CW SOUNDS GREAT Schematic of N0WVA’s single-FET regen. It is a monobander on 75/80M. Note: Barry W6YE looked closely at the bandset trimcap in the photos below (the one marked in the schematic above as being 10pF) and discovered, using the part number visible in the picture, that it is a 7-45pF part. Thank you for this information Barry! THE VE7BPO DIRECT CONVERSION RECEIVER MAINFRAME The VE7BPO Direct Conversion Receiver Mainframe. This is one of those projects that has been residing in my head for a long time, as something I wanted to build. I’ve always liked direct conversion receivers. With them, as with regens, I felt that they have been underestimated by many builders and hams as being novelty items. THE K7TMG HF MORSE CODE TEMPERATURE The K7TMG HF Thermometer. It’s a simple one-transistor Colpitts oscillator with the positive supply line keyed by an ATTiny13 micro-controller. The genius (as with so many things these days) is in the code that Sholto wrote. It converts the analog voltage from an LM335 temperature sensor to Morse code and announces it, about once aminute, in
YUP – IT’S ANOTHER SI5351 VFO – DAVE RICHARDS AA7EE To many, this will be just another Si5351 VFO project, with nothing to distinguish it from the others. In fact, that's exactly what it is. The "how to" of connecting an Arduino board to an Si5351 board, wiring up a display, and loading the firmware, is straightforward, and wellestablished. To
THE VK3YE MICRO 40 DSB TRANSCEIVER The VK3YE Micro 40 DSB Transceiver. I have attempted to build 2 DSB transceivers now with limited success – a Manhattan version of G3WPO and G4JST’s DSB80 – here and here (the original kit version which Richard F5VJDD sent me for reclamation, worked fine) and the ZL2BMI rig, here and here. Both of them worked FB up to and including the TX AN END FED HALFWAVE ANTENNA FOR PORTABLE OPS An end-fed halfwave, often referred to by the acronym EFHW, seemed to be a good choice, as it only requires a support at the far end. I saw photos that Steve WG0AT had posted on Facebook of his little EFHW, with the matching unit built into a dental floss container, for a light and compact solution. I wanted an antenna that small and TELESCOPIC FIBERGLASS MASTS According to Henry K4TMC, the proprietor of The Mast Co, this pole can support a lightweight HF dipole fed by RG8X (lightweight meaning made out of fairly light gauge wire with no traps). You can also support a small beam if you attach it part-way down the mast. This is a great all-purpose experimental antenna mast.“THE RUGSTER”
When 4SQRP brought out a version of the David Cripe NM0S-designed Hi-Per-Mite Filter, I noticed that it could be configured to give up to 50dB of gain. Like many others, I'm sure, my next thought was that it would make the process of building a simple direct conversion receiver even simpler. I decided that at some point, A WBR REGEN ON THE 30M AMATEUR BAND A WBR Regen On The 30M Amateur Band. Occasionally, I drag out old projects from their resting and display positions on my shelf, plug ’em in, and give ’em a whirl. It’s fun to watch as past home-brew rigs come back to life, and relive the feelings of wonder, as a handful of parts that I soldered together actually receivesignals and in
ON QSL CARDS
Steve VE7SL had cards printed by VE7DK that closely resembled many vintage cards, and I was impressed with the result. This page shows some vintage cards from Steve’s collection (opens in a new browser window) and also the card that he had VE7DK print for him. As an aside, Steve built his own replica of a “Paraset” (opens in a newbrowser
THE C CRANE SKYWAVE SSB PORTABLE RADIO This is a cracking little radio. It has coverage of the AM and FM broadcast bands, SW from the top of the AM BC band all the way to 30MHz, the weather band, and air band. It does AM, SSB, and CW (as well as FM on the FM broadcast band), and has some useful filtering options (all the way down to 500Hz when on CW). DAVE RICHARDS AA7EEK3WWPMESQUARESSINGLE LEVER PADDLENAQCCG4JSTN0XAS When I built the VE7BPO DC Receiver Mainframe recently, it wasn’t intended to end up as a final finished project. The intention was more to have it as part of an experimental platform. The little box that contains the DBM, diplexer, and AF amplifier that make up the mainframe will most likely stay largely the Written by AA7EE. A PASSIVE TUNABLE HF PRESELECTOR A Passive Tunable HF Preselector. When I built the VE7BPO DC Receiver Mainframe recently, it wasn’t intended to end up as a final finished project. The intention was more to have it as part of an experimental platform. The little box that contains the DBM, diplexer, and AF amplifier that make up the mainframe will most likely stay largely the A SCRATCH-BUILD OF N6KR AND WILDERNESS RADIO’S SST FOR 20MSESPE WILDERNESS CONTACTSESPE WILDERNESS AREASESPE WILDERNESS HOT SPRINGSSESPE WILDERNESS TRAIL MAP Designed by Wayne N6KR in the late 90’s, appearing as a full article in QRPp, and a kit sold by Wilderness Radio, it ignited the imaginations of a whole generation of builders for it’s combination of simplicity, performance, and willingness to accept modifications cheerfully. The review from Adventure Radio Society was quitepositive.
THE VK3YE MICRO 40 DSB TRANSCEIVER The VK3YE Micro 40 DSB Transceiver. I have attempted to build 2 DSB transceivers now with limited success – a Manhattan version of G3WPO and G4JST’s DSB80 – here and here (the original kit version which Richard F5VJDD sent me for reclamation, worked fine) and the ZL2BMI rig, here and here. Both of them worked FB up to and including the TX THE ZL2BMI DSB TRANSCEIVER The ZL2BMI DSB Transceiver – An Update. A couple of years ago (gosh – has it been that long?) I attempted to build the ZL2BMI DSB transceiver for 80M. It was an appealing design, being simple, and capable of being built into a compact space. Eric, the designer, had originally conceived it in the mid 1980’s as a very small rig to beused
THE SW200 – A BUDGET AM BROADCAST PROCESSOR FOR LPAM – AND Note that although the audio processor described in this article is intended primarily for Part 15 AM broadcasters, and perhaps also low power licensed AM broadcasters on a budget, it may also have applications for hams with their AM endeavors. I'm thinking of the AM enthusiasts on 160, 80, and 40. Some of them are ex-broadcast THE DSB80 – A DIRECT CONVERSION DSB TRANSCEIVER FOR 80M BY I was 19 years old in March 1983 when the UK magazine Ham Radio Today published the article "A Low Cost DSB/CW Transceiver for 80M". Being short of cash and wanting to get on the air, I sent away for the kit and soon after, was surfing the phone portion of the UK 80M band A WBR REGEN ON THE 30M AMATEUR BAND A WBR Regen On The 30M Amateur Band. Occasionally, I drag out old projects from their resting and display positions on my shelf, plug ’em in, and give ’em a whirl. It’s fun to watch as past home-brew rigs come back to life, and relive the feelings of wonder, as a handful of parts that I soldered together actually receivesignals and in
THE NORCAL 2N2/40 CW TRANSCEIVER KIT For about 10 years, a lot of folk built these neat little transceivers manhattan style until the Norcal QRP Club came along to help those of us who still want to build things, but like to have them in the form of a ready-to-assemble kit. The Norcal 2N2/XX series of kits included a double-sided PCB and to many, this was just too good to resist. N0WVA’S ONE-FET REGEN OPTIMIZED FOR SSB/CW SOUNDS GREAT Schematic of N0WVA’s single-FET regen. It is a monobander on 75/80M. Note: Barry W6YE looked closely at the bandset trimcap in the photos below (the one marked in the schematic above as being 10pF) and discovered, using the part number visible in the picture, that it is a 7-45pF part. Thank you for this information Barry! DAVE RICHARDS AA7EEK3WWPMESQUARESSINGLE LEVER PADDLENAQCCG4JSTN0XAS When I built the VE7BPO DC Receiver Mainframe recently, it wasn’t intended to end up as a final finished project. The intention was more to have it as part of an experimental platform. The little box that contains the DBM, diplexer, and AF amplifier that make up the mainframe will most likely stay largely the Written by AA7EE. A PASSIVE TUNABLE HF PRESELECTOR A Passive Tunable HF Preselector. When I built the VE7BPO DC Receiver Mainframe recently, it wasn’t intended to end up as a final finished project. The intention was more to have it as part of an experimental platform. The little box that contains the DBM, diplexer, and AF amplifier that make up the mainframe will most likely stay largely the A SCRATCH-BUILD OF N6KR AND WILDERNESS RADIO’S SST FOR 20MSESPE WILDERNESS CONTACTSESPE WILDERNESS AREASESPE WILDERNESS HOT SPRINGSSESPE WILDERNESS TRAIL MAP Designed by Wayne N6KR in the late 90’s, appearing as a full article in QRPp, and a kit sold by Wilderness Radio, it ignited the imaginations of a whole generation of builders for it’s combination of simplicity, performance, and willingness to accept modifications cheerfully. The review from Adventure Radio Society was quitepositive.
THE VK3YE MICRO 40 DSB TRANSCEIVER The VK3YE Micro 40 DSB Transceiver. I have attempted to build 2 DSB transceivers now with limited success – a Manhattan version of G3WPO and G4JST’s DSB80 – here and here (the original kit version which Richard F5VJDD sent me for reclamation, worked fine) and the ZL2BMI rig, here and here. Both of them worked FB up to and including the TX THE ZL2BMI DSB TRANSCEIVER The ZL2BMI DSB Transceiver – An Update. A couple of years ago (gosh – has it been that long?) I attempted to build the ZL2BMI DSB transceiver for 80M. It was an appealing design, being simple, and capable of being built into a compact space. Eric, the designer, had originally conceived it in the mid 1980’s as a very small rig to beused
THE SW200 – A BUDGET AM BROADCAST PROCESSOR FOR LPAM – AND Note that although the audio processor described in this article is intended primarily for Part 15 AM broadcasters, and perhaps also low power licensed AM broadcasters on a budget, it may also have applications for hams with their AM endeavors. I'm thinking of the AM enthusiasts on 160, 80, and 40. Some of them are ex-broadcast THE DSB80 – A DIRECT CONVERSION DSB TRANSCEIVER FOR 80M BY I was 19 years old in March 1983 when the UK magazine Ham Radio Today published the article "A Low Cost DSB/CW Transceiver for 80M". Being short of cash and wanting to get on the air, I sent away for the kit and soon after, was surfing the phone portion of the UK 80M band A WBR REGEN ON THE 30M AMATEUR BAND A WBR Regen On The 30M Amateur Band. Occasionally, I drag out old projects from their resting and display positions on my shelf, plug ’em in, and give ’em a whirl. It’s fun to watch as past home-brew rigs come back to life, and relive the feelings of wonder, as a handful of parts that I soldered together actually receivesignals and in
THE NORCAL 2N2/40 CW TRANSCEIVER KIT For about 10 years, a lot of folk built these neat little transceivers manhattan style until the Norcal QRP Club came along to help those of us who still want to build things, but like to have them in the form of a ready-to-assemble kit. The Norcal 2N2/XX series of kits included a double-sided PCB and to many, this was just too good to resist. N0WVA’S ONE-FET REGEN OPTIMIZED FOR SSB/CW SOUNDS GREAT Schematic of N0WVA’s single-FET regen. It is a monobander on 75/80M. Note: Barry W6YE looked closely at the bandset trimcap in the photos below (the one marked in the schematic above as being 10pF) and discovered, using the part number visible in the picture, that it is a 7-45pF part. Thank you for this information Barry! AN END FED HALFWAVE ANTENNA FOR PORTABLE OPS An end-fed halfwave, often referred to by the acronym EFHW, seemed to be a good choice, as it only requires a support at the far end. I saw photos that Steve WG0AT had posted on Facebook of his little EFHW, with the matching unit built into a dental floss container, for a light and compact solution. I wanted an antenna that small and THE VK3YE MICRO 40 DSB TRANSCEIVER The VK3YE Micro 40 DSB Transceiver. I have attempted to build 2 DSB transceivers now with limited success – a Manhattan version of G3WPO and G4JST’s DSB80 – here and here (the original kit version which Richard F5VJDD sent me for reclamation, worked fine) and the ZL2BMI rig, here and here. Both of them worked FB up to and including the TX TELESCOPIC FIBERGLASS MASTS According to Henry K4TMC, the proprietor of The Mast Co, this pole can support a lightweight HF dipole fed by RG8X (lightweight meaning made out of fairly light gauge wire with no traps). You can also support a small beam if you attach it part-way down the mast. This is a great all-purpose experimental antenna mast. A WBR REGEN ON THE 30M AMATEUR BAND A WBR Regen On The 30M Amateur Band. Occasionally, I drag out old projects from their resting and display positions on my shelf, plug ’em in, and give ’em a whirl. It’s fun to watch as past home-brew rigs come back to life, and relive the feelings of wonder, as a handful of parts that I soldered together actually receivesignals and in
N0WVA’S ONE-FET REGEN OPTIMIZED FOR SSB/CW SOUNDS GREAT Schematic of N0WVA’s single-FET regen. It is a monobander on 75/80M. Note: Barry W6YE looked closely at the bandset trimcap in the photos below (the one marked in the schematic above as being 10pF) and discovered, using the part number visible in the picture, that it is a 7-45pF part. Thank you for this information Barry! THE WBR – A SIMPLE HIGH PERFORMANCE REGEN RECEIVER FOR 40M The WBR – A Simple High Performance Regen Receiver for 40M by N1BYT. EDIT (July 26th 2014) – If you’re thinking of building the WBR, I strongly suggest you check out my most recent build here, which incorporates a mod suggested by LA3PNA, and a different configuration for the AF amp that I think provides nicer sounding audio. THE C CRANE SKYWAVE SSB PORTABLE RADIO This is a cracking little radio. It has coverage of the AM and FM broadcast bands, SW from the top of the AM BC band all the way to 30MHz, the weather band, and air band. It does AM, SSB, and CW (as well as FM on the FM broadcast band), and has some useful filtering options (all the way down to 500Hz when on CW). THE NA5N DESERT RATT 2 REGEN The toroid was fixed to the PCB with nylon nuts, bolts and washers that I got from my local Ace hardware store. Here are some pictures of my Desert Ratt 2 with the circuit finished –. The red wires running along the back of the front panel are the regulated 2.1V and 2.75Vlines.
A 2 TRANSISTOR TRANSMITTER POWERED FROM A 9V BATTERY A 2 Transistor Transmitter Powered From a 9V Battery. A couple of days ago I built a simple 2 transistor transmitter on a small piece of PCB material. I used the style of construction that seems to be becoming my default – Manhattan-style using MeSQUARES from QRPMe. Rex is out of stock as I write this, but expects to have them back in soon. THE SPROUTIE MK II HF REGEN RECEIVER The knob on the left is connected to the 10-turn regen pot (via a 3/16″ to 1/4″ shaft coupler), while the black escutcheon plate is spaced away from the front panel by washers, and attached to it in a fixed position with 4-40 hardware –. Here’s The Sproutie MK II with her little sister, for size comparison –.Skip to content
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DAVE RICHARDS AA7EE
Written by AA7EE March 8,2019April 16, 2019
ROD KQ6F HAS A NEW SW200 AM PROCESSOR FOR SALE Please note that the above photo is of my SW200, though Rod’s no doubt looks exactly the same. A few months back, I received this note from Rod KQ6F – Hi Dave – I very much enjoyed your review on this product. It was largely the reason I bought one. Myapplication is AM
Written by AA7EE January 3, 2019August 11, 2019 PUTTING THE HIFER “BRS” BORIS BEACON ON THE AIR – FINALLY! In this post from May of last year, I detailed the construction of a 1mW solar-powered HiFER beacon. I named it the Boris Beacon, in tribute to my neighbor’s cat. The beacon was never mounted permanently outside. I kept it indoors, powered from a small solar panel in the window, and feeding an “antenna” of Written by AA7EE December19, 2018
THE C CRANE SKYWAVE SSB PORTABLE RADIO This will be a very brief post, and in no way constitutes a review. It’s barely even an “initial impressions” type of post. It’s just that I’ve been wanting a C Crane Skywave SSB for a while now, recently purchased one, and wanted to tell you! I’m sure many readers will identify with the search Written by AA7EE December 13, 2018December 13, 2018 GUEST POST – N6JJA’S WBR-OSCAR REGEN RECEIVER Back in May of this year, Sheldon N6JJA began sending me information and details of his version of N1BYT’s WBR regenerative receiver. It went through several iterations, before ending up at the final version as shown here. Even this version is still a work in progress – as all good products of experimentation are. Sheldon Written by AA7EE May 11, 2018January 10, 2019 YUP – IT’S ANOTHER SI5351 VFO To many, this will be just another Si5351 VFO project, with nothing to distinguish it from the others. In fact, that’s exactly what it is. The “how to” of connecting an Arduino board to an Si5351 board, wiring up a display, and loading the firmware, is straightforward, and well established. To me though, it was Written by AA7EE May 7, 2018January 19, 2019 THE BORIS BEACON – A 1MW SOLAR-POWERED HIFER BEACON My build of the K7TMG HF Morse Code Thermometer was fun, and it inspired me to use the same circuit to create a new HiFER beacon to honor my neighbor’s cat Boris. With some of my indoor cat-owning neighbors in the past, I have acted as caretaker when their parentsare out of town or
Written by AA7EE April 19, 2018January 17, 2019 THE K7TMG HF MORSE CODE TEMPERATURE BEACON This was a fun little project – and it gave me an idea for a future one. Sometimes, I find that the more complex undertakings, which require more planning, can get to the point that they “take me over” somewhat. At that point, for me, some of the fun starts getting squeezed out and that,POSTS NAVIGATION
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