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Baycom modem, The famous "PMP" (Poor man packet!) -
Yaesu Vertex VX-170 FM 2 meter handheld specifications by Universal Radio -
G0HWC details and HTML files with images to build yourself a Ham Radio website. Get your Ham Web Site on the internet for free -
The MC3423 can protect sensitive circuity from power supply transients or regulator failure when used with an external "Crowbar" SCR. -
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W1AEX Audio settings and general observations -
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Solving interference from television channel 11 on 144MHz transverters by Chris Cox, NØUK, G4JEC -
Extending TX for the Kenwood TS-590s HF Transceiver -
beacon transmits on 10.368,850 MHz in the 3cm-band -
This resource compiles claimed scores, often referred to as "rumor scores," for numerous amateur radio contests, providing a historical snapshot of competitive activity from 1993 through 2007. It lists entries for prominent events such as _CQWW CW_, _ARRL Sweepstakes_, _IOTA Contest_, and various _NAQP_ events, categorized by year and contest. Each entry typically includes the contest name and the month/year of operation, allowing users to quickly navigate to specific contest periods. The site also references the _3830 Web Page_ on Contesting.com as the primary submission portal for these claimed scores. The collection offers a unique perspective on contest participation and performance trends over more than a decade, preceding the widespread adoption of real-time score reporting systems. While not official results, these rumor scores provided early indications of top performers and overall activity levels for a wide array of HF and some VHF contests, including _ARRL 10M_ and _CQWW VHF_. The historical data can be useful for analyzing past contest popularity, identifying consistently strong operators, or simply reminiscing about earlier competitive eras in amateur radio. -
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DF9CY Softrock RXTX Software Defined Radio Transceiver (SDR) -
This Microphone comparison article summarizes the test results of two popular ham radio microphones the ElectroVoice RE27 and Heil PR781 -
Anderson Powerpole connectors are becoming the standard for Raynet ARES and RACES groups as well as many Ham radio shacks round the world. This recourses page will give you a guide to Anderson Powerpole connectors in the radio shack. -
Taken from April 1935 issue of QST page 60 where there is a short article on the origin of 73 -
A very popular method of making a short dipoles resonate at a given frequency. This type of antenna is suitable for single band, narrow bandwidth use. -
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Using the raspberry Pi for amateur radio operations with digital mode decoding and log book program -
Radio amateurs worldwide are being asked to help collect data from the student-built SSETI Express satellite, due to be placed in orbit on 27 September. To encourage them, ESA’s Education department has organised two competitions and is supplying free downloadable software. -
Pictures of Hellschreiber machines as projected by Rudolf Hell -
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A page dedicated to servicing and building a 10 meter band moxon Antenna -
MB7ICL Echolink Node Clacton on Sea, Essex The Gateway to the world -
Article on Phase-cancellation of noise on 2m band -
Online calculator for Input coil data, LC Resonant Frequency and L match -
Article describes a circuit that accelerates the coil of DC relays by momentarily doubling their voltage. -
Tuning non-resonant antennas and usage of such technique during contests. -
The normal way to make a good balun is to wind a core with a bifilar winding about 8-10 turns, and then connect the coax to one side and the antenna to the other. -
Converting the GN9120 Wireless Bluetooth Interface for Amateur Radio -
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Mods for Kenwood TS-950SD / SDX -
Softrock Version 6.1 Software Defined Radio experience and modifications by DF9CY -
An interesting article by V2EVN on moxon yagi antennas -
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Learnings from the 6Y4A CQ WW CW Contest By K2KW and N6BT -
Long distance operations on WiFI band by Yolo Amateur Radio Society -
What you really need to know about spectrum analyzers -
These pages document some of the experiments with KB9YIG\'s Soft Rock 40 receiver -
Right Mark Audio Analyzer is a suite designed for testing quality of any audio devices, be it a sound card, an MP3 player, a consumer CD/DVD player or a radio. -
A great page about RTL-SDR and GNU Radio with Realtek RTL2832U [Elonics E4000/Raphael Micro R820T] software defined radio receiver. -
Some observations on the Yaesu FT-817 5W portable HF VHF UHF transceiver with some pictures and movies -
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SSTV images on this page are taken live from other SSTV sites round the world. -
Drake Mods for R4B and R4C models by VE3EFJ -
PSK63 APRS mobile tracker for HF, FreeTrak63 - APRS PSK63 Tracker -
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28.2575 MHz Beacon from Lake Constance water works Germany -
MFSK is an easy-to-use chat mode for real-time amateur contacts, nets and bulletin transmissions, but not intended for contesting or Bulletin Board System (BBS) use. It is a half-duplex non-Automatic Repeat ReQuest (ARQ) forward-error-correcting (FEC) mode. It performs well on long-path fading conditions and in the presence of interference