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TELESCOPIC MAST
Raising the STL antennas at least 1-2 m above the pergola (2.5 m high) has shown to considerably increase DX performance in the otherwise "shielded" directions. So, for my STLs and general experiments, I decided to acquire a telescopic mast. It should be extendable to80M SHORT VERTICALS
Latest page update: 7 August 2019. INTRODUCTION. This page is a collection of short vertical antennas that I built over the years, for the 80 mtr band. With "short" I mean between 3 and 10% of λ. That is a lot shorter than a standard 1/4 λ vertical. Anything less than 75% of full-size is actually a real compromise.20M SHORT VERTICALS
4. My really short 20 mtr dipole (2x 0.7 m, 2x2.3 ft !!!) ) that can easily be installed vertically is described here. 20 MTR VERTICAL MID-LOADED 2x3 MTR (2x10 FT) DIPOLE. In May of 2008, I dug up my my 20 meter mid-loaded short dipole from a dark corner of my "antennacemetery".
W3EDP MULTI-BAND ANTENNA W3EDP Multi-band Antenna Published on September 22, 2013 in Amateur Radio and Radio Antennas. 4 Comments A description of the W3EDP antenna entitled An Unorthodox Antenna was published in the March OPTIMIZING THE W3EDP ANTENNA Optimizing the W3EDP Antenna Published on September 29, 2013 in Amateur Radio and Radio Antennas. 2 Comments The W3EDP multi-band HFwire antenna is
"BERNHARD" STATION BE-5 Fig. 288: Bernhard station Be-5 is marked on a map of Kdo. Flughafenbereich 8/XII (Laval) This Berhard-station was the fourth to be discovered by the British, in aerial photos of September 1942 (ref. 174H). Those photos show three large huts (two with estimated size of 80x44 ft , one of 70x52 ft ) located on the sameknoll as
THE FABULOUS DIPOLE
Steve Finch, AIØW June 2006 34 Two Band, Single Feed Dipole • Make a 40 meter dipole and feed with twin lead or balun and coax • Make a 20 meter dipole and attach at ALL SORTS OF SMALL ANTENNAS Adelaide 4 Feb 2008 9 Demonstration of AMA3 (from AA&A) Notes on Loop: 1. 83cm diameter loop of 3.2cm diameter aluminium tube, 2. Original 15cm loop feed not used. ALAN KEY) REPRINTED PERMISSION TAMING THE END-FED ANTENNA Alan Chester, GSCCB (Silent Key) Reprinted with permission from Radio Communication September 1994 TAMING THE END-FED ANTENNA T he single wire antenna directly connect- ed to the transmitter is often discour- aged in the amateur radio manuals NONSTOP SYSTEMS: CONSULTING SERVICES FOR THE DEVELOPMENT CONSULTING SERVICES FOR THE DEVELOPMENT OF FAULT-TOLERANT SYSTEMS. System dependability modeling and analysis. System architecture evaluation and trade studies. Textbooks on reliable and dependable computing systems [old sampleTELESCOPIC MAST
Raising the STL antennas at least 1-2 m above the pergola (2.5 m high) has shown to considerably increase DX performance in the otherwise "shielded" directions. So, for my STLs and general experiments, I decided to acquire a telescopic mast. It should be extendable to80M SHORT VERTICALS
Latest page update: 7 August 2019. INTRODUCTION. This page is a collection of short vertical antennas that I built over the years, for the 80 mtr band. With "short" I mean between 3 and 10% of λ. That is a lot shorter than a standard 1/4 λ vertical. Anything less than 75% of full-size is actually a real compromise.20M SHORT VERTICALS
4. My really short 20 mtr dipole (2x 0.7 m, 2x2.3 ft !!!) ) that can easily be installed vertically is described here. 20 MTR VERTICAL MID-LOADED 2x3 MTR (2x10 FT) DIPOLE. In May of 2008, I dug up my my 20 meter mid-loaded short dipole from a dark corner of my "antennacemetery".
W3EDP MULTI-BAND ANTENNA W3EDP Multi-band Antenna Published on September 22, 2013 in Amateur Radio and Radio Antennas. 4 Comments A description of the W3EDP antenna entitled An Unorthodox Antenna was published in the March OPTIMIZING THE W3EDP ANTENNA Optimizing the W3EDP Antenna Published on September 29, 2013 in Amateur Radio and Radio Antennas. 2 Comments The W3EDP multi-band HFwire antenna is
"BERNHARD" STATION BE-5 Fig. 288: Bernhard station Be-5 is marked on a map of Kdo. Flughafenbereich 8/XII (Laval) This Berhard-station was the fourth to be discovered by the British, in aerial photos of September 1942 (ref. 174H). Those photos show three large huts (two with estimated size of 80x44 ft , one of 70x52 ft ) located on the sameknoll as
THE FABULOUS DIPOLE
Steve Finch, AIØW June 2006 34 Two Band, Single Feed Dipole • Make a 40 meter dipole and feed with twin lead or balun and coax • Make a 20 meter dipole and attach at ALL SORTS OF SMALL ANTENNAS Adelaide 4 Feb 2008 9 Demonstration of AMA3 (from AA&A) Notes on Loop: 1. 83cm diameter loop of 3.2cm diameter aluminium tube, 2. Original 15cm loop feed not used. ALAN KEY) REPRINTED PERMISSION TAMING THE END-FED ANTENNA Alan Chester, GSCCB (Silent Key) Reprinted with permission from Radio Communication September 1994 TAMING THE END-FED ANTENNA T he single wire antenna directly connect- ed to the transmitter is often discour- aged in the amateur radio manuals80M SHORT VERTICALS
Latest page update: 7 August 2019. INTRODUCTION. This page is a collection of short vertical antennas that I built over the years, for the 80 mtr band. With "short" I mean between 3 and 10% of λ. That is a lot shorter than a standard 1/4 λ vertical. Anything less than 75% of full-size is actually a real compromise.TELESCOPIC MAST
Raising the STL antennas at least 1-2 m above the pergola (2.5 m high) has shown to considerably increase DX performance in the otherwise "shielded" directions. So, for my STLs and general experiments, I decided to acquire a telescopic mast. It should be extendable toSSTV CAM OF N4SPP
ABOUT THIS SSTV CAM. Created mid-2008. Standard frequency: 14230 kHz. Date + time (UTC) of reception is indicated in the lower left-hand corner of each image. Station locator: JN03qo. SSTV software: good old MMSSTV. Auto-slant is typically OFF. In other words: WYSIWYG ("whatyou send is
80M END-HAT VERTICALS Current distribution along a radiating element, without and with end-hat loading (common-mode suppression at feedpoint assumed) My end-hat and center-loaded, very short (but quite effective) 80 mtr vertical dipole is described on this page.A variation on this technique is the "umbrella" vertical antenna. 80M MID-LOADED DIPOLE 4. My 80 m short (vertical) dipole with center -loading is described on this page . IMPORTANT Note that at my QTH, the installation height of dipoles is basically limited to 2 m (6 ft). The minimum installation height of a horizontal dipole is often stated as about 0.05 λ. For the 80 mtr band, that is 4-5 m (13-16 ft).THE FABULOUS DIPOLE
Steve Finch, AIØW June 2006 34 Two Band, Single Feed Dipole • Make a 40 meter dipole and feed with twin lead or balun and coax • Make a 20 meter dipole and attach at HOW DESIGN GAMMA-MATCHING NETWORKS where XS HZ d Ra2 xaZ M= . ohms HZ (R,' + xa2) X il, = tan-' [ 'sRa + 2 degrees Ra I To match a lossless high-frequency trans- mission-line characteristic resistance, Ro, M cos $ = Ro ohms The lumped reactance, XI., added in series with Zi to tune out or cancel the reactive component of Zi can be determined from eliminates a separatecalculation for Zo.
THE SLINKY ANTENNA
The Slinky Antenna A lot of signal for not many $$$ by N6XN The Slinky is a toy made from a 90 turn spring. Way back in 1948, so the story goes, a bored machinist cranked one THE CARE AND FEEDING OF DIGITAL, 54 www.rfdesign.com April 2002 the bandwidth is 1/τ, but the time domain tails decay rapidly. It is inter-esting to note that the α= 1 case offers a double-sided bandwidth of 2/τ. BC-348 FAQ - NONSTOP SYSTEMS BC-348 FAQ The AC supply was a common mod and there were many variations. They were normally built onto the same chassis that the dynomotor was mounted on. If you can get the original mount bracket with shock mounts, that is a real plus. NONSTOP SYSTEMS: CONSULTING SERVICES FOR THE DEVELOPMENT CONSULTING SERVICES FOR THE DEVELOPMENT OF FAULT-TOLERANT SYSTEMS. System dependability modeling and analysis. System architecture evaluation and trade studies. Textbooks on reliable and dependable computing systems [old sample N4SPP ANTENNA PROJECTS N4SPP antenna projects. WELCOME to my antenna pages! What you will find here, are illustrated descriptions of my never-ending antenna experiments. Basically my annotated "lab notes". I am not on a quest for the "holy grail of antennas" - just trying to find the best antenna system for my particular circumstances, and have somehome-building fun
MULTI-BAND END-FED
Figure 20: Nominal dimensions of the multi-band end-fed antenna. The antenna generally has a high impedance (several thousand ohm) on most bands. So an impedance transformation ratio of about 1:50 to 1:60 is needed to get down to 50 Ω. I.e., a turns ratio of about 1:7 to 1:8.80M SHORT VERTICALS
Latest page update: 7 August 2019. INTRODUCTION. This page is a collection of short vertical antennas that I built over the years, for the 80 mtr band. With "short" I mean between 3 and 10% of λ. That is a lot shorter than a standard 1/4 λ vertical. Anything less than 75% of full-size is actually a real compromise.80-20M MAG LOOP
80-20m Mag Loop. This page provides a top-level description of Small Transmitting Loop (STL) antennas (a.k.a. "Magnetic Loop Antenna", MLA), and my two versions of such an antenna for 80 mtrs and up. My smaller 40-20 loop is described here. My helically wound "Slinky" loopis described here.
OPTIMIZING THE W3EDP ANTENNA Optimizing the W3EDP Antenna Published on September 29, 2013 in Amateur Radio and Radio Antennas. 2 Comments The W3EDP multi-band HFwire antenna is
80M MID-LOADED VERTICAL With material left over from my base-loaded designs, I have decided to make a center-loaded vertical for 80 mtrs. I have a section of 1.5 m (5 ft) copper tubing (16 mm OD, 5/8"), and 2.5 m aluminum tubing (7½ mm OD). OK, so the coil will not be exactly at the half-way point of the 4 mtr "short" antenna. W3EDP MULTI-BAND ANTENNA W3EDP Multi-band Antenna Published on September 22, 2013 in Amateur Radio and Radio Antennas. 4 Comments A description of the W3EDP antenna entitled An Unorthodox Antenna was published in the March "BERNHARD" STATION BE-5 Fig. 288: Bernhard station Be-5 is marked on a map of Kdo. Flughafenbereich 8/XII (Laval) This Berhard-station was the fourth to be discovered by the British, in aerial photos of September 1942 (ref. 174H). Those photos show three large huts (two with estimated size of 80x44 ft , one of 70x52 ft ) located on the sameknoll as
ALAN KEY) REPRINTED PERMISSION TAMING THE END-FED ANTENNA Alan Chester, GSCCB (Silent Key) Reprinted with permission from Radio Communication September 1994 TAMING THE END-FED ANTENNA T he single wire antenna directly connect- ed to the transmitter is often discour- aged in the amateur radio manuals NONSTOP SYSTEMS: CONSULTING SERVICES FOR THE DEVELOPMENT CONSULTING SERVICES FOR THE DEVELOPMENT OF FAULT-TOLERANT SYSTEMS. System dependability modeling and analysis. System architecture evaluation and trade studies. Textbooks on reliable and dependable computing systems [old sample N4SPP ANTENNA PROJECTS N4SPP antenna projects. WELCOME to my antenna pages! What you will find here, are illustrated descriptions of my never-ending antenna experiments. Basically my annotated "lab notes". I am not on a quest for the "holy grail of antennas" - just trying to find the best antenna system for my particular circumstances, and have somehome-building fun
MULTI-BAND END-FED
Figure 20: Nominal dimensions of the multi-band end-fed antenna. The antenna generally has a high impedance (several thousand ohm) on most bands. So an impedance transformation ratio of about 1:50 to 1:60 is needed to get down to 50 Ω. I.e., a turns ratio of about 1:7 to 1:8.80M SHORT VERTICALS
Latest page update: 7 August 2019. INTRODUCTION. This page is a collection of short vertical antennas that I built over the years, for the 80 mtr band. With "short" I mean between 3 and 10% of λ. That is a lot shorter than a standard 1/4 λ vertical. Anything less than 75% of full-size is actually a real compromise.80-20M MAG LOOP
80-20m Mag Loop. This page provides a top-level description of Small Transmitting Loop (STL) antennas (a.k.a. "Magnetic Loop Antenna", MLA), and my two versions of such an antenna for 80 mtrs and up. My smaller 40-20 loop is described here. My helically wound "Slinky" loopis described here.
OPTIMIZING THE W3EDP ANTENNA Optimizing the W3EDP Antenna Published on September 29, 2013 in Amateur Radio and Radio Antennas. 2 Comments The W3EDP multi-band HFwire antenna is
80M MID-LOADED VERTICAL With material left over from my base-loaded designs, I have decided to make a center-loaded vertical for 80 mtrs. I have a section of 1.5 m (5 ft) copper tubing (16 mm OD, 5/8"), and 2.5 m aluminum tubing (7½ mm OD). OK, so the coil will not be exactly at the half-way point of the 4 mtr "short" antenna. W3EDP MULTI-BAND ANTENNA W3EDP Multi-band Antenna Published on September 22, 2013 in Amateur Radio and Radio Antennas. 4 Comments A description of the W3EDP antenna entitled An Unorthodox Antenna was published in the March "BERNHARD" STATION BE-5 Fig. 288: Bernhard station Be-5 is marked on a map of Kdo. Flughafenbereich 8/XII (Laval) This Berhard-station was the fourth to be discovered by the British, in aerial photos of September 1942 (ref. 174H). Those photos show three large huts (two with estimated size of 80x44 ft , one of 70x52 ft ) located on the sameknoll as
ALAN KEY) REPRINTED PERMISSION TAMING THE END-FED ANTENNA Alan Chester, GSCCB (Silent Key) Reprinted with permission from Radio Communication September 1994 TAMING THE END-FED ANTENNA T he single wire antenna directly connect- ed to the transmitter is often discour- aged in the amateur radio manuals NONSTOP SYSTEMS: CONSULTING SERVICES FOR THE DEVELOPMENT CONSULTING SERVICES FOR THE DEVELOPMENT OF FAULT-TOLERANT SYSTEMS. System dependability modeling and analysis. System architecture evaluation and trade studies. Textbooks on reliable and dependable computing systems [old sample N4SPP ANTENNA PROJECTS N4SPP antenna projects. WELCOME to my antenna pages! What you will find here, are illustrated descriptions of my never-ending antenna experiments. Basically my annotated "lab notes". I am not on a quest for the "holy grail of antennas" - just trying to find the best antenna system for my particular circumstances, and have somehome-building fun
SSTV CAM OF N4SPP
ABOUT THIS SSTV CAM. Created mid-2008. Standard frequency: 14230 kHz. Date + time (UTC) of reception is indicated in the lower left-hand corner of each image. Station locator: JN03qo. SSTV software: good old MMSSTV. Auto-slant is typically OFF. In other words: WYSIWYG ("whatyou send is
80-20M MAG LOOP
80-20m Mag Loop. This page provides a top-level description of Small Transmitting Loop (STL) antennas (a.k.a. "Magnetic Loop Antenna", MLA), and my two versions of such an antenna for 80 mtrs and up. My smaller 40-20 loop is described here. My helically wound "Slinky" loopis described here.
TELESCOPIC MAST
Raising the STL antennas at least 1-2 m above the pergola (2.5 m high) has shown to considerably increase DX performance in the otherwise "shielded" directions. So, for my STLs and general experiments, I decided to acquire a telescopic mast. It should be extendable to 80M MID-LOADED VERTICAL With material left over from my base-loaded designs, I have decided to make a center-loaded vertical for 80 mtrs. I have a section of 1.5 m (5 ft) copper tubing (16 mm OD, 5/8"), and 2.5 m aluminum tubing (7½ mm OD). OK, so the coil will not be exactly at the half-way point of the 4 mtr "short" antenna.20M MINI YAGI BEAM
In its simplest form, the Uda "beam" antenna is a 2-element antenna. It has a single radiating element that is "driven", i.e., is connected to a transmitter (or receiver, or transceiver), and a single passive element. The latter is not driven. Typically, the driven element is ROTARY DIPOLE 20-10M Amateur Radio antenna pages of Frank N4SPP. Fig. 3: Staggered diameters of the telescopic aluminum tubing sections. Each section (other than the 20 mm OD section) is inserted in the next-size-up section: the 8 mm OD section into the 10 mm OD section ( = 8 mm ID), 10 mm OD into 12 mm OD ( = 10 mm ID), and 12 mm OD into 16 mm OD ( = 12 mm ID), and 16mm OD into 20 mm OD ( = 16 mm ID).THE FABULOUS DIPOLE
Steve Finch, AIØW June 2006 34 Two Band, Single Feed Dipole • Make a 40 meter dipole and feed with twin lead or balun and coax • Make a 20 meter dipole and attach atNONSTOPSYSTEMS.COM
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