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Extension of the Kenwood TS-590S Programmable Function by CT7AEZ

Schematic of a fast charger for Gel Cell batteries

A dual band dipole antenna for 40 and 80 meters band. Total lenght of 26 meters, foreseen two coils at aprox 11 meters distance from center feed.

A large table wit properties of popular coaxial cables

DMR Contact Manager is a Free software package designed to make it easy to maintain channel, zone, contact and call group information in these radios. It is fully compatible with the Ham-Digital and RadioID database systems and allows instant codeplug updates from a wide variety of sources. DMR Contact Manager is designed for use with Connect Systems CS700/CS701/CS750/CS800/CS801/CS800D radios, as well as the Tytera MD-380/390/390GPS, TYT MD2017/MD9600, AnyTone AT-D868UV and AT-D858, Retevis RT3, and similar radios that use the RDT/RDB file formats.

dedicated to the discussion & development of ALL amateur / ham radio Digital Voice & Data communication

A squint at the world of LF This website was initially thrown together to provide ready availability to data being collected from the measurement of a transatlantic LF (Low Frequency) path.

Online calculator for J-Pole antennas. The J-pole antenna consists of a short and a long vertical pole with a feed point near the bottom. The antenna looks like the letter J, hence the name J-pole antenna.

Converting the Jabra A210 Bluetooth Interface for Ham Radio

Programming memories manually the Baofeng UV-5R

Comparing many antennas for 50 MHz band

Blog site for various home brew projects including antennas, power dividers etc

Specialized in manufacturing measurement instruments for more than 25 years. Clamp meter, digital multimeter, analog panel meter, thermometer, and led panel meter

DXWatch provide live spots for FT5GA Glorioso dxpedition 2009

As FT8, JT65 and JT9 are a time synchronized protocol, one soon discovers that an accurate PC clock is very important. If your workstation time is off it can cause you to send when no one is listening, or to listen when no one is sending.

How to improve your transmitting antennas for very low solar activity periods, vertically polarized 160 meter antennas, horizontally polarized 80 to 10 meter antennas, single or stacked yagis, multi-tower stations

Information on so-35 satellite

Manufactures automatic mixers, analog and DSP signal processors, room combining and matrix mixers, and audio test equipment for just about any customer application.

This is the website for K3LP, well known DXer and DX-peditioner. Look for Dave during the main four Contests (ARRL DX CW/SSB and CQWW SSB/CW)

News/Projects for Amateur Radio

Moonbounce is the ultimate long path DX. It is exciting and allows you to literally work the world on VHF and UHF. It is not as difficult as you may think. Here is how to get started on this most exciting mode

The Radio Amateur Megacycle Society

The first interactive map of amateur radio repeaters and more updated in REAL TIME.

The CQ World Wide DX Contest records document top scores, with the Multi-Multi SSB category showing CN8WW achieving **78,170,508 points** in 2000. These records span from 1948 to 2025, categorizing results by region, operating class (e.g., Single Operator High Power, Low Power, QRP, Assisted), and specific bands like 10M, 15M, 20M, 40M, 80M, and 160M. For instance, EF8R (E77DX) holds the All-Band High Power SSB record with **25,747,775 points** in 2025. Each entry includes the callsign (with operator callsign in parentheses for guest ops), year of operation, and total score. The _CQ WW DX Contest_ also features records for the RTTY and VHF contests, alongside the main SSB and CW categories. QRP records demonstrate significant achievements, such as P40W (W2GD) with 5,097,780 points in the All-Band SSB QRP category in 2000. Multi-Two and Multi-Single categories are also detailed, providing a comprehensive overview of competitive performance.

White Tower DX Team DX peditions and contests team from Greece

Adding a Software Defined Radio to an SO2R station

Antenna Authority Inc. offers a wide assortment of directional, wideband antennas and other equipment specifically engineered for radio direction finding (DFing) and geolocation applications. Their product line includes _log periodic_, _cavity-backed spirals_, and _Yagi_ antennas, alongside covert antenna solutions for various operational requirements. The company emphasizes its expertise in designing and manufacturing specialized antennas for both overt and covert operations. Beyond standard offerings, Antenna Authority Inc. provides custom design services to meet specific client needs, focusing on tailored RF directional products. Their capabilities extend to developing antennas for vehicles and optimizing their operational performance in diverse scenarios. The firm is located at 3381 W. County Line Road, Douglasville, Ga. 30135-1145. Ferrel Bentley is associated with Antenna Authority Inc., which has been operating since at least 2005, as indicated by the copyright notice.

Low Country Amateur Radio Club Summerville, South Carolina 147.060+ / 147.030

Signal generatos, oscillators, direct and indirect synthesizers, exciters custom oscillators

Review of the X1M HF QRP trasceiver by VE3FAL

Soldering and de-soldering professionals. Provide quality stations, irons, and rework systems

13cms and 23cms ATV my projects and builds. Also using wifi amps on 13cms, 13cms dish feeds using a Sky dish. GB3CZ

An interesting article on pedestrian portable HF DXing

BCHF 14.316 MHz Broadcasters HF NET where radio/tv broadcasters-engineers meet 2300 UTC Sunday's

APRS4R Digipeater configuration notes by K6DBG

Official kenwood document explaining proper procedure to upgrade firmware on a Kenwood TS-590S

PS8RF beacon tx in 7.035 Mhz with 3 W

Have wondered why a Smith chart has such strange grid lines. Believe it or not, there is a logical progression from Speedometers to Smith charts that will make the Smith grid crystal clear.

Jules Verne's "Around the World in 80 days" is old fashion way. Be an amateur radio I'll bet you'll rounding the world just on a flash!

Horizontal polarized omni directional 50MHz Antenna. This antenna is intented to use in a contest station as a second system beside the stacked yagi beam system. An omnidirectional systeem can be an advantage when it comes to short openings on wich the operator must react quickly.

Yahoo Group dedicated to the Amateur Radio Community, not the Commercial Sector.

Students interested in HAM activities at Indian Institute of Technology, Bombay.

OpenRepeater is a low cost, low power, but feature rich duplex repeater controller suitable for setting up a temporary / emergency repeater systems with radios that can be run on portable power. Download the latest OpenRepeater software for your Raspberry Pi 2/3/3B+/4. This image contains everything you need to get up and running quickly.

Sams Photofact download Schematics and Service Manuals, Originals and downloads.

Multi-op contest station of Joe Rudi, NK7U of Baker City, Oregon, USA

Main High Frequency Antennas from the 2009 LARC FARL Field Day, Ford Amateur Radio League. A document comparing antenna performances and flexibility among a G5RV an Carolina Windom and a Cushcraft R7 vertical antenna.

Using Chokes and Traps: how to make them, how they work.

Android Echolink client to connect to the echo link network

High performance Software and Devices

In this article, K8CU describes his custom design that uses an embedded controller and touch screen LCD panel.