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How to build a lightweight amplifier that can be backpacked around.

17-Element Very High Frequency/Ultra High Frequency Log Period Dipole Array

Packet Radio networking home page with lots of informations and tech. resources

Deploying robust antenna infrastructure for both fixed and portable operations often requires specialized support structures capable of withstanding environmental stresses while providing optimal radiating element placement. SMC offers a range of solutions, including pneumatic masts and push-up masts, designed to facilitate rapid deployment and reliable long-term support for various antenna types. Their product line encompasses antenna mounts, poles, and complete antenna systems, addressing the critical need for stable and efficient RF communication. The company's offerings extend to HF antennas, including dipoles and _NVIS_ (Near Vertical Incidence Skywave) antennas, which are crucial for short-range regional communications on bands like 80m and 40m. These systems are engineered for durability and performance, ensuring signal integrity across diverse operating conditions. With over **65 years** of experience, SMC has established itself as a global manufacturer in this niche. Their product portfolio also includes antenna support towers, catering to more permanent installations requiring significant height and load capacity for multiple arrays.

VK3YE magnetic loop antenna plan that cover 7 Mhz to 20 Mhz and shortening loop can work on 21 Mhz.

An excellently presented article on the design and construction of a medium wave DX Antenna

A delta loop antenna for the 4 meter band by GW7AAV

Thierry LOMBRY, ON4SKY, develops in several long articles the bascis of propagation. His website includes also a French section dealing with auroras.

Build an effective dipole antenna that needs much less space by adding two loading coils. This online calculator tells you how.

Radio programming software for the ICOM IC-R10 receiver

One point eight MHz to 30 MHz is the operational bandwidth for this 4:1 Ruthroff voltage balun, designed to interface an unbalanced T-Match network with a balanced antenna system. The project details the construction using a _T200-2_ powdered iron toroid core, tightly wrapped in PVC electrical tape for insulation, and wound with 17 double bifilar turns of 1.25mm enamelled copper wire. This outboard balun offers flexibility, allowing hams to trial various baluns based on antenna system and impedance characteristics, rather than integrating it directly into the tuner. The resource includes a schematic of the balun, a wiring diagram showing winding connections, and a table suggesting alternative toroid cores like the T80-2 or T400-2 with corresponding winding counts. Component sourcing is straightforward, listing items such as the _Amidon_ T-200-2 core, SO-239 connector, and a sealed polycarbonate enclosure from Jaycar. Performance evaluation was conducted using an _AIM 4170C_ antenna analyser, demonstrating efficient 1:4 voltage transformation across the specified HF spectrum. Further efficiency tests involved measuring RF power loss at various frequencies, revealing minimal loss—less than 0.7 dB from 3.6 MHz to 30 MHz, and only 2.0 dB at 1.8 MHz. These measurements, performed under ideal 50-ohm conditions, confirm the balun's effectiveness as a low-loss interface for multi-band antenna systems. The page also links to several other balun and unun projects, including 1:1 current and voltage baluns, and 9:1 voltage ununs, providing a broader context for impedance matching solutions.

A simple coax dipole antenna for 144 MHz by 9A7PJT

QRP and other projects from Honolulu, HI

Amateur radio dealer in Talladega Alabama

Chinese VHF UHF handheld two-way radio manufacturer

Digital Vector Wattmeters, Dummy loads, software defined panadapter systems, SteppIR Tuning Relay, Digital SWR meters, LP-Pan Pan Adapter IQ Decoder for SDR based panadapter system

US Antenna manufacturer offering base and mobile antennas for 2 meter, 1.25 meter and 70 cm Amateur Radio GMRS and MURS Citizens Band Radio VHF and UHF Business Band Radio HF, VHF and UHF Scanning

Australian dealer for UHF CB radios, Amateur Radio HF VHF Radios, GPS navigation systems, two-way radio, cordless telephones, radar detectors, marine electronics, amateur radio gear and many other consumer electronic products.

Crystal-controlled QRP tranceiver by F6BCU for 80 meters band 1W output

The online home of Stirling & District Amateur Radio Society

The multiuser/multitasking BPQ Packet Terminal Driver program is a general purpose communications package for communicating with a packet TNC or Baycom modem attached to your IBM-PC/clone in conjunction with the BPQ Node software.

Yaesu FT857D No TX Audio, video on reparing and yaesu Mic modification, with audio improvements for SSB and FM

LoTW and eQSL export utility for Windows allows you to export your LOTW and eQSL marked qso's from Logger32 or an existing ADIF file. This program has been discontinued by author in favour of L32 LogSync.

Another radio control softwrare for the Yaesu FT 100 by Federico Batarse, XE2NLM

A Loop Fed Array Yagi antenna for 50 MHz featuring 11 dBi gain and 23 f/b ratio. In this excellent page the author even includes a detailed drawing in DWG format, with element lenght and spacing measures, in a separa file a full list of material list needed to build this yagi antenna including source and price, the EZnec file for this antenna plan, and a lot of pictures of this LFA Yagi for 50 Mhz. A ten page PDF file containing all infos, is also available to download.

Join IC-V8000 Yahoo! owners gourp here

Quality communication accessories for motorola, icom, kenwood and nextel radios

Information on ham radio including qrp, radio kits, Heathkit sw-717, Realisitic DX-160 and DX-302, and more.

Presents a curated collection of newsletters dedicated to _Earth-Moon-Earth_ (EME) communications, primarily focusing on the 432 MHz band and higher microwave frequencies. The resource details various EME DX experiences and news contributions from operators like K2UYH (W6/PA0ZN), offering insights into successful moonbounce contacts and operational strategies. It serves as an archive of specialized content for those engaged in or interested in extreme weak-signal propagation via the moon. The newsletters provide practical information on achieving EME contacts, often including details on station setups, antenna arrays, and signal reports from challenging DX. For instance, operators might report achieving contacts over **750,000 km** round trip, demonstrating the feasibility of long-distance communication on UHF and microwave bands. The content differentiates itself by concentrating on the unique technical and operational aspects of EME, which contrasts significantly with terrestrial DXing, providing a specialized knowledge base for advanced amateur radio operators.

MS Word document with FT-1000 S meter characteristics

Rutherford County Sheriff and Fire Live Scanner Audio Feed on RadioReference.com

Web forum with an open marketplace to sell and buy old radios

Elongated Terminated Loops, usage and details by K9AY Lewallen

Optimization tests of the W3EDP multi-band HF wire antenna a popular aerial among QRP enthusiasts because it is light weight and cheap.

Thousands of electronic and electro-mechanical parts and supplies

Speaker Microphone Pin Out, Dual PTT Switching,Programming Cables, SMA Antenna Connection, Extended Antenna Threads for Baofeng UV 3, UV 5 Series handheld transceivers

Generates Morse tones using the Soundcard. A neat tool for sending out short sequences of Morse tones.

Mailing list for people interested in building radio and electronics equipment from kits or from scratch. Frequent topics include shortwave radio receivers, construction techniques, and ham radio project.

Mobile antennas, alternative power sources, ham radio accessories

This simple and cost effective interface circuit is designed for use with any ICOM amateur radio equipment with CIV interface

The rhombic antenna is often claimed to be an exceptionally good antenna with very high gain. Modelling rhombic antennas

Modified transverter for converting SSB CB to LF for thru-the-earth voice communications

All antennas that are situated close to the ground are affected by that ground to some extent. This article explain effects and benefits of counterpoise.

Raising large Yagi antennas can be a challenging project. A trolley system will make the job a lot easier

Amateur Radio operator interested in mobile & emergency operations, with some portable QRP operations.

Amateur radio cartoons by Woody Epp W7EPP

Search-Find-View-Download SWL/Ham Call Signs world-wide. Create-Send-Receive eQSL cards on-line - free, including bureau. Much more, ALL especially for the discriminating SWL.

KJ4WLH homemade dipole for 50 Mhz

This antenna is designed to be mounted off the side of a tower. Works on 136-153 Mhz range but also on 70 cm band

A complete guide to magnetic loop antenna construction, with analysis of multi-turn and single-turn magneti loops, and and insight on choosing the optimal capacitor, or homebrewing your own butterfly capacitor