Building a new lithium battery
Technical Reference/Batteries
Homebrew a custom lithium battery pack with 5s3p batteries
40m Wire Antennas Comparison
Antennas/40M
On the field comparison among C-Pole antenna, an EFHW vertical antenna and an Inverter V dipole antenna. Test is done using two identical WSPRLite beacons that transmit with 200mW on the WSPR frequency and analyzing spotted results.
Dx-peditions365 App
Software/Android
Dx-peditions365 let you follow the main DX-peditions on a dedicated calendar page that shows the schedule of all monthly expeditions, running dxpeditions and even shows the dxpeditions reported on their users logs or cluster spots. App available on apple iOS and Android.
Three-Element Hex Beam Project
Antennas/HexBeam
Building the Three-Element Hex Beam. A project and construction phase of an HF hex-Beam antenna using trees to hang the antenna and a Channel Master antenna rotator.
New ARRL Video Helps Members Navigate Digital Magazines
ARRL The National Association for Amateur Radio® is helping members get more out of their digital magazine experience. ARRL members all have digital access to four high quality magazines: QST, On The Air, QEX, and NCJ. If you have questions or concerns about how to get the most out of the digital editions, a new video on the ARRLHQ YouTube channel will help walk you through it.
The video, hos...
Tripod Platform and Bi-Quad Antenna Mount
Antennas/Masts and mounts
23cm Transverter and Bi-Quad antenna mounted on a customized Tripod
9:1 Balun and Unun
Antennas/Baluns
Homebrew a 9:1 transformer and measurement for testing purposes with a miniVNA
Devastating Hawaii Wildfires Prompt Response from Amateur Radio Emergency Service
ARRL The National Association for Amateur Radio® is closely following updates from the Hawaii Amateur Radio Emergency Service®, Hawaii ARES®, as amateur radio operators respond following deadly wildfires on the Hawaiian island of Maui.
On Tuesday, August 8, wildfires, fueled by the strong winds of Hurricane Dora, were burning in Maui and Hawaiʻi Counties. By the next day, much of Lāhainā on Mau...
White Rock Amateur Radio Club
The Radio Club was formed at the request of long term resident and mayor, Hardy Staub, VE7IDY, to provide the city with an Amateur radio communication resource, should the need arise.
Treasure Valley Radio Association K7OJI
Radio club serving ham operators in Southwestern Idaho and Eastern Oregon.
Variations on a Dipole
Antennas/Theory
Antenna patterns are all about interference. Presentation on wire antennas for HF bands. Dipoles, horizontal and vertical dipoles, effects of ground on radiation patterns, multi-band wires antennas. Knowing what you should expect from the radiation patterns for waves on your wires will help you choose what will work best for your needs. The principles of interference can lend insight into what to expect from a wire antenna.
Top Amateur Radio Websites - Issue 2330
Raspberry PI remote Ham Radio Server, High Performance Common-Mode Chokes, DIY Yagi Antenna, A High Performance RF Choke for the HF bands, Thunderstorm connected with Sporadic E propagation, QRZ.sh, Portable Operating Tips for Ham Radios,
ARRL Audio News August 11, 2023
ARRL Audio News August 11, 2023
New ARRL Video Helps Members Navigate Digital Magaines
ARRL The National Association for Amateur Radio® is helping members get more out of their digital magazine experience. ARRL members all have digital access to four high quality magazines: QST, On The Air, QEX, and NCJ. If you have questions or concerns about how to get the most out of the digital editions, a new video on the ARRLHQ YouTube channel will help walk you through it.
The video, hos...
Two New Digitpeating Amateur Radio Satellites Approved
The International Amateur Radio Union (IARU) has coordinated two European digipeating satellites that are scheduled to launch in fall 2023. At the Technical University of Košice in Slovakia, satellite Veronika, a 1U CubeSat, is scheduled for launch on a Falcon 9 launcher on the Transporter 9 mission in October 2023. The satellite will be equipped with a 24/7 digipeater on two different bands, as...
Cloverleaf Antenna
Antennas/WiFi
Cloverleaf antenna is a circular polarized antenna which is way better than the cheap dipole antenna that comes with video transmitters and receivers. The Cloverleaf is a closed loop antenna which the signal and ground wires are connected. The cloverleaf antenna has 3 loops at 120 degree apart, and they are titled at 45 degree to horizontal plane.
Repair of an FT-1000 MP Mark V
Radio Equipment/HF Transceivers/Yaesu FT-1000MP
Repair of a Yaesu FT-1000 MP Mark V probably struck by lightning.
Yaesu FTDX101D QST Review
Radio Equipment/HF Transceivers/Yaesu FTDX101
Yaesu FTDX101D HF and 6-Meter Transceiver ARRL QST review
GP Antenna for 1296 MHz
Antennas/23cm
Quarter wave Ground Plane antenna for the 23 cm band, 1296 MHz.
Performance of 49:1 Ferrite Core Transformers
Antennas/Theory/Impedance matching
There are quite a few recipes for building a suitable transformer for an end fed half wave antenna (EFHW), but I was never sure I really understood the main principles. So, I wound a bunch of transformers, made measurements on them using my NanoVNA, learned how to get what I really wanted out of the VNA measurements, and in the process discovered how to build better transformers and be able to predict what they will do
CWvox
Technical Reference/Arduino
A voice keyer for Morse Code written for Arduino
WOLF HF-VHF-UHF All mode Transceiver
Top Amateur Radio Websites - Issue 2329
Simple Ham Radio Remote, The Smith Chart, LW MW Antennas and More, KC7NYR Amateur Radio Site, Battery University, Antenna Measurements, Conventional or Inverter Generators, KX3 assembly videos
8010 Enfed Antenna
Antennas/End-Fed
With this antenna the coverage is 80,40,20,15 and 10 meter band without any antenna tuner and the average SWR is below 1.2 on phone bands. The total antenna lenght is about 23 meters , with one 20.4 meters long segment from the 1:49 transformer to the 110uh coil and about 2.2 meters long segment from the coil to the insulator.
ARRL Audio News August 4, 2023
ARRL Audio News August 4, 2023
23cm Yagi antenna
Antennas/23cm
Solid Brass 6el 23cm Yagi antenna for SOTA. Construction of a rugged solid brass DL6WU yagi ready for the SOTA backpack for 1.296 GHz
Yaesu FT-818 Details
Radio Equipment/HF Transceivers/Yaesu FT-818
Yaesu FT-818ND HF VHF UHF All mode portable transceiver. Announced in 2018, production of this QRP all mode portable transceiver has been discontinued some years later.
ARRL Files Comments Against “Seriously Flawed” HF Rules Petition
ARRL The National Association for Amateur Radio®, as part of its mission to protect Amateur Radio, has filed comments against a proposal that would introduce high-power digital communications to the shortwave spectrum that in many instances is immediately adjacent to the Amateur HF bands.
The “Shortwave Modernization Coalition” (SMC), which represents certain high-frequency stock trading intere...
End Fed Antenna for WARC Bands
Antennas/End-Fed
I used a FT 240-43 for much more power, not needed but beter safe than sorry.
150 Watt continious, 300 Watt PEP SSB, 90 Watt Digimodes 10 Mhz, 18 Mhz, 24 Mhz Very easy to build design and a good antenna for people who don't have much space for big towers or long wires This design is from Hans - PE1RNU
Repeaters a guide for Beginners
Operating Modes/Repeaters
If you are totally new to all this and have never used a Repeater before, this post may help you a little.
ARRL and NASA Team Up to Help Teachers
A radio experiment held on July 26, 2023, to decode a slow-scan TV (SSTV) message sent via the ham radio station on the International Space Station (ISS) was successful. The image was received by a group of educators at the headquarters of ARRL The National Association for Amateur Radio® in Newington, Connecticut through the voice repeater on the ISS. Teachers from around the United States we...
ARRL Headquarters is Closing Early on Friday, August 4, 2023
ARRL The National Association for Amateur Radio® will close at 12 PM Eastern time (1600 UTC) on Friday, August 4, 2023, for a staff event.
The ARRL Headquarters lobby and store, as well as W1AW, will be open to visitors from 8 AM to 12 PM EDT.
There won’t be any interruptions to the W1AW bulletin or code practice transmissions. W1AW will follow its regular transmitting schedule. Additionally, th...
Hurricane Watch Net Seeks Bilingual Net Control Operators
The Hurricane Watch Net (HWN) is looking for new members who are willing to train to become Net Control Operators. HWN is especially interested in recruiting bilingual operators who are fluent in Spanish and English or French/Creole and English. Net Control responsibilities can entail hours of duty to ensure all received ground-truth weather reports are forwarded directly to the National Hurric...
Filers Seek Extension on Shortwave Petition. ARRL to File Comments.
[Updated 7/31/2023] Since May, ARRL The National Association for Amateur Radio® has been reviewing the rules proposed in a petition before the Federal Communications Commission (FCC) from the “Shortwave Modernization Coalition” (SMC). The ARRL Laboratory has been studying the petition out of concern for potential interference to Amateur Radio communications.
Comments on the petition, RM-11953, w...
Open-Folded W8JK Antenna for HF
Antennas/Multiband
Originally designed by John Kraus, W8JK in about 1940, this antenna has some interesting properties.
The W8JK antenna is 2 (Two) centre-fed double-dipole fed by a pair of anti-phase signals. Small size, simple antenna, offer nice performance but need a tuner. Tested in this project from 30m to 6m bands
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