30m Half -Size Rotary Dipole
Antennas/30M
A rotary dipole antenna for 30 meters band. Each arm is about 12.5 ft and is constructed from telescoping fibreglass flag/fishing poles and short lengths of aluminium tubing. Two short lengths of glass-fibre rod were used to insulate the arms from the supporting hardware.
A switched Capacitor Audio Filter
Technical Reference/Audio
Here is a rather nice audio filter for use with Ham Radio gear. It features switchable operation as a -32 dB per octave low pass or notch filter having a 200Hz-2500Hz tunable cutoff frequency, buffered input and output, switch selectable filter bypass function, and good stability. T
VARA
Software/Weak Signal
VARA HF is a soundcard modem that can be found on the HF bands exchanging traffic (Winlink). VARA implements an High Speed Data Mode and comes in 2 separate programs VARA FM and VARA HF. VARA is a High Performance HF modem based on OFDM modulation. VARA Modem, brings state of the art Military grade technology to new and existing HF data. Introduces a new standard of technology available for Amateur and Commercial use. Designed for operation within a SSB Bandwidth of 2400 Hz.
RDXC
Rhein Ruhr DX Association
Build the K1FM-Loop
Antennas/Magnetic Loop
The latest version of the K1FM-Loop is electrically similar to the previous one, but it is designed around off-the-shelf parts or, more generically, items you can readily order online. This antenna relies heavily on 3D printing.
Top Amateur Radio Websites - Issue 2304
Telescoping PVC mast, Morse CW, HAM Radio DIY Projects by DL8ABH, CTR2-Mini Radio Controller, It's Ham Radio, W5BCS Bryan Amateur Radio Club, Arkansas Diamond Amateur Radio Club, The United States Awards Net, N4POW Powhatan Area Radio Club, W9ZL Fox Cities Amateur Radio Club,
Remote solution for TS590s
Radio Equipment/HF Transceivers/Kenwood TS-590S
How to use a small USB DJ controller to remote control the Kenwood TS-590s
ARRL Audio News January 20, 2023
ARRL Audio News for January 20, 2023
Amateur Satellite FalconSAT-3 Nears Reentry
Many amateur radio operators and satellite watchers have been predicting the date and time of reentry for FalconSAT-3 (FS-3). While all reentry predictions are something of a guessing game due to the large number of variables affecting the upper atmosphere, it is certain that the end for FS-3 will be coming very soon, possibly the week of January 16 - 21, 2023.
Radio Amateur Satellite Corporatio...
Winter Field Day 2023
Winter Field Day (WFD), sponsored by the Winter Field Day Association, is coming again. This year, the dates are January 28 and 29. Radio clubs around the country are activating for this event. Complete rules can be found on the WFD website, at Home - Winter Field Day. Combining this with ARRL's yearlong event, Volunteers On the Air, is a great way to make contacts that count for both activitie...
29th Annual Dayton Contest Dinner is May 20, 2023
The North Coast Contesters will host the 29th Annual Dayton Contest Dinner at the Hope Hotel, located at Wright-Patterson Air Force Base in Dayton, Ohio, on Saturday night, May 20, 2023, at 6:30 PM. Master of Ceremonies will be John Dorr, K1AR, and the 2023 Keynote Speaker is Bryant Rascoll, KG5HVO. Rascoll, of Montgomery, Alabama, was the 2018 recipient of the Bill Pasternak Memorial Amateur R...
Proposals Sought to Host 2026 World Radiosport Team Championship -- WRTC
The World Radiosport Team Championship Sanctioning Committee (WRTC-SC) is accepting proposals for hosting the 2026 WRTC event. The World Radiosport Team Championship is an on-site amateur radio competition, usually held every 4 years.
Previous WRTCs have been held in Seattle, San Francisco, Slovenia, Finland, Brazil, Russia, Boston, and Germany. WRTC 2022, delayed due to the COVID-19 pandemic, ...
70 MHz Transverter
Technical Reference/Transverters
This page gives a brief description of a 70 MHz transverter that has been published in the Danish amateur radio magazine "OZ." This way hams outside Denmark may also benefit from the design.
How to call CQ as an HF QRP station
Operating Modes/QRP
Tutorial, How to call CQ as an HF QRP station in SSB/Phone. Calling CQ Basics, Calling CQ QRP or Portable
A JFET preamplifer for 50 MHz
Technical Reference/Preamplifiers
The circuit is simple, designed with a low component count and an inherent simplicity in order to keep the cost of building the preamplifier low, and to assure low noise operation.
SAFARI 40-30m vertical Antenna
Antennas/40M/40 meter Vertical Antennas
Roach pole vertical antenna for 40 and 30 meters band featuring good performance on short skips contacts compared to wire dipole
WA6TST Barstow Amateur Radio Club - B.A.R.C
WADARC
Wirral & District Amateur Radio Club
Small Loop Antenna for the 80m to 10m
Antennas/Loop
This article describes the development of two tunable antennas each consisting of three interconnected small loops and capable of providing excellent DX performance. The aerials are home-constructed, and located in a very small garden with a minimum of visual impact on the neighbours and are low enough in height to avoid the attention of UK planning authorities.
SMRA
Emergency repeater network supporting ventura county
A Simple Hybrid Software Defined Radio
Technical Reference/Software Defined Radio
This Hybrid SDR is a combination of a current technology analog radio techniques, used with a direct conversion software defined radio to create a single conversion "hybrid" radio that is usable over a wide range of frequencies
Top Amateur Radio Websites - Issue 2303
1:49 unun for end fed half wave antennas, Understanding computer-generated RFI, Unpredictable Aspects of 160 meter Propagation, Current Space Weather Parameters, Robust PACKET at SigIDWiki, Kenwood TS-590 Driver, HamAward, 5V7RU Log Online,
TN8K Congo 2023
DX Resources/DX Peditions/2023 DXpeditions
Dates: Arrival: January 6th , Departure : January 21th 2023 Call sign: TN8K
Operators - Petr OK1BOA, Petr OK1FCJ, Palo OK1CRM, Pavel OK1GK , Ruda OK2ZA, Ludek OK2ZC, Karel OK2ZI, David OK6DJ
Bands: 160-6m + QO-100
The GAWANT Antenna
Antennas/Portable
The GAWANT Antenna, or Shinagawa Antenna is an half-wave vertical end-fed in a FT817-friendly package
ARRL Audio News January 13, 2023
ARRL Audio News for January 13, 2023
Orlando HamCation Presents Its 2023 Award Winners
Just a month ahead of its big event in Florida, Orlando HamCation® has announced the 2023 HamCation Award winners.
Ken Lyons, KN4MDJ (left), is a 2023 Carole Perry Educator of the Year Award winner. Photo courtesy of HamCation.
Ken Lyons, KN4MDJ, and Jim Storms, AB8YK, are the 2023 recipients of the Carole Perry Educator of the Year Award. The award is given to individuals who have made outstandi...
HAARP Thanks Amateur Radio Operators for Help with Latest Experiment
On Tuesday, December 27, 2022, the High-frequency Active Auroral Research Program (HAARP) conducted its latest ionospheric experiment of bouncing radio signals off an asteroid passing near Earth's orbit (see the ARRL News story from December 23, 2022).
A frosty landscape surrounds antennas at the High-frequency Active Auroral Research Program site in Gakona, Alaska, on December 20, 2022. [JR Anc...
MFJ-434 Voice Keyer
Radio Equipment/Voice Keyers
Let this microprocessor controlled MFJ Contest Voice KeyerTM call CQ, send your call and do contest exchanges for you in your own natural voice
Arnaldo de Jesús Coro Antich, CO2KK, Silent Key
Arnaldo de Jesús Coro Antich, CO2KK, passed away January 8, 2023. Coro was born on July 2, 1942. He was a founding member, since 1966, of the Federation of Radio Amateurs of Cuba [Federacion de Radioaficionados de Cuba].
"At the age of 12, [Coro] joined what was then the Radio Club de Cuba, the association that brought together radio amateurs in the capital in the late 1950s," included a report ...
WA3COM Washington Amateur Communications
A Foxhunting Jamboree
Operating Modes/Radio Direction Finding
Fox Hunting for Scouts. Jamboree can be an opportunity to promote ARDF among Scouts all around the world.
All About Scouting - Radio Scout
Ham Radio/Radio Scouting
Online free HAM Radio course for Scouts, Guides, Rovers, Rangers
A Simple Spectrum Analyzer
Technical Reference/Spectrum Analyzers
This is a swept-filter spectrum analyzer. Basically, RF and swept oscillator signals are fed to a mixer and the output of the mixer is passed through a highly selective crystal filter.
WSJT-X 2.6.0 New version available to download
WSJT-X 2.6.0 has been officially released and implements new features supporting the ARRL International Digital Contest and several new improvements.
A More Efficient Magnetic Loop Antenna
Antennas/Magnetic Loop
The idea behind this antenna was to use multiple conductors in parallel to reduce the resistance losses in the antenna , and thereby improve the efficiency.For a given magnetic loop antenna, doubling the number of conductors from one to two will typically increase efficiency by about a factor of two. There is a limit, and beyond three or four conductors further increases are small, and may not be worth the bother.
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