Search results

International supplier of radio astronomy products

An SDR classification model edited ty Christophe F4DAN The model consists in describing a SDR with letters and digits, each one indicating the value of the corresponding key parameter.

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.

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.

The Denton County Amateur Radio Association is located in Denton, Texas

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.

Gridmaker takes your ADIF-file and searches for all the grids on the specified band. It then makes files for use in DXAtlas

Extending The Bandwidth of 80 Meter Dipoles

My expeditions and personnal station site of CW-PLAYER, SAT-EXPLORER from F6DQM

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.

Wide selection of quality, affordable shipping cases including stock and custom, heavy duty, pelican protector, removable top, wheeled, ATA, and more!

Annual Down East Hamfest is an ARRL Sanctioned Hamfest

Contest log Written by Isao Suzuki JK1IQK, english and japanese version available

TEAC is an ARRL Affiliated Amateur Radio Club serving the Northeast area of Harris County including Humble, Kingwood, Atascocita, Huffman, Porter and surrounding areas.

Ham Radio Club for Norwich, CT. Meetings are the 3rd Thursday of each month at Norwich F D HQ, 10 N. Thames St., Norwich, CT at 7:45pm.

We are a group of over 100 people dedicated to Amateur Radio.

This detailed guide provides step-by-step instructions on setting up a HamClock for your shack using a Raspberry Pi and the HamClock 4.21 software. It includes recommendations for hardware such as Raspberry Pi models, SD cards, PSUs, and displays. The guide covers installation, setup, configuration, and suggestions for customizing the default settings. Whether you are a beginner or experienced ham radio operator, this guide will help you create a functional HamClock for your shack with ease.

The **Arlington Amateur Radio Club** (K5SLD) website details club activities, including a weekly Taco Tuesday net on their 147.140 MHz repeater with a 110.9 Hz PL tone. The club, organized in July 1955 by 22 hams, also hosts monthly dining events and promotes Community Emergency Response Team (CERT) training through the Arlington Fire Department. Membership renewal information for 2026 dues is prominently featured, with an online payment option and a donation button available on the "Pay Dues" page. Club communications extend to a dedicated Facebook page for members and the wider amateur radio community. The site lists upcoming contests and encourages participation in local events. The 2-meter repeater net is open to all, fostering local camaraderie and technical exchange among hams in the Arlington, Texas area, regardless of club affiliation.

Experimental Software for Radio Shack PRO-92 and PRO-2067 Scanners

A simple DIY project to have a remote cw key connected to your Rig. On the remote side it uses and Arduino Uno board and a cheap HanRun Enc28J60 ethernet shield. On the local side it uses a Morse Key connected to a serial port.

The South Jersey DX Association was first organized in 1978 by N2OO

Smart antennas or the adaptive antenna array and smart antenna technology used with SDR, cognitive radio, MIMO, and other new technologies.

Based in Agawam, MA USA

Founded in 1924 CSRA is one of the oldest ham radio clubs in the USA

Europeam perspective on BPL PLC

ECARS began operation in 1968 as an Amateur Radio public service net for mobile operators on 7.255 MHz

Dubus article about DL6WU long yagi antennas for 23 cm band Article is both in german and english. Yagi antennas are valid alternative to dishes for troposcatter operations. This article explains design and mechanical data for 1296 MHz Yagi Antennas

Common problems of the 572B tubes often used in many RF Power Amplifiers

Sound card based multimeter

The Nashoba Valley Amateur Radio Club (NVARC) was formed in Groton, Massachusetts, in the spring of 1992 and has grown from the original 13 founders to over 60 members.

Online Constant - k Lowpass Filter calculator

Live Audio Feed of the KI4FVI repeater in henry county Georgia

Our mission is the promotion and advancement of amateur radio activities within our county and surrounding areas.

FA-Kleinanzeigen is a dedicated platform for amateur radio enthusiasts in Germany to buy and sell equipment. The site features a wide range of classified ads, including HF and VHF radios, antennas, and accessories. Users can post their listings for free, making it an accessible resource for both seasoned operators and newcomers looking for second-hand gear. The platform categorizes listings into various sections, such as QRP technology, military radios, and even antique equipment, catering to diverse interests within the ham radio community. In addition to equipment sales, FA-Kleinanzeigen also allows users to search for specific items, making it easier to find rare or specialized gear. The site emphasizes user engagement, encouraging individuals to create accounts for posting ads and interacting with other members. With a focus on the German market, it serves as a valuable resource for local hams seeking to expand their stations or offload surplus equipment. Whether you're looking for a new transceiver or just browsing for interesting finds, FA-Kleinanzeigen is a go-to destination for amateur radio classifieds.

Homebrew, QRP, Beacons & Diplomatic / Spy Radio

Relevance of a proper ground systems on short HF vertical antennas, with an analysis on a vertical antenna for 160 meter band

Simulation of a top loaded vertical antenna for 1.2 MHz

The Horn reflector antenna at Bell Telephone Laboratories

An excellent and comprehensive article on portable HF operations with attention on selecting proper equipment

JAS-2 is prepared to succeed the communication of JAS-1b launched in February 1990 and still working. So JAS-2 is also capable of phone,CW and packet BBS.

Founded by a small group of young hams in East St. Louis, Illinois, the W9AIU Egyptian Radio Club serves as a local amateur radio organization. The club's origins trace back to meetings held in Herb Wilhelm's, W9APX, dry cleaning shop, indicating a grassroots beginning for this community group. It operates as a typical ham radio club, fostering camaraderie and likely supporting various aspects of the hobby for its members. As an amateur radio club, W9AIU likely engages in activities such as local nets, field day operations, and perhaps provides licensing support or technical discussions. Such clubs are crucial for new hams seeking mentorship and for experienced operators looking to participate in group activities like contesting or public service communications. The club's presence in Illinois suggests a focus on local and regional amateur radio initiatives.

ARA was founded on 1976 by a group of hams on the island of St. Miguel aiming to create the first civil Radio Amateur club,located in Ponta Delgada.

A Bass Eq Pre amplifier for high impedance PU by ON6MU

Butterworth Highpass Filter Designer

An antenna for 80 meters band for those who does not have enough space to setup a halwave wire dipole that is aprox 130ft or 40 meters. The antenna is an open-wire-fed shortened dipole

This project fills the need for a 706 mic/headphone/PTT adapter.

A summary, overview or tutorial covering the basics of Meteor Scatter or Meteor Burst Communications, a form of radio signal propagation often used at VHF.

Near Vertical Incidence Skywave propagation is a form of radio wave propagation used on the MF and HF bands to provide radio communications and broadcasting coverage over short distances, especially where the terrain contains obstacles.

A great and efficient monoband VHF portable antenna. The article consist of two version of a 12.5 Ohm 3 elements yagi beam antenna plans for the two meter band, a full sized and a shortened version expecially designed for the SSB and CW on 144 MHz.