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Manuf RF power amplifiers wideband+narrowband for Commercial, Defense, OEM and amatuer markets. Also low-noise rf amplifiers

A short dipole wire antenna for 40 meters band. It is a folded dipole that do not make use of coils and can be used either in horizontal or inverted V configuration

Replicating vintage radio components addresses the challenge of restoring classic receivers and transmitters to their original aesthetic and functional condition. Many historical radios, particularly those from the _Golden Age of Radio_ (1920s-1940s), suffer from brittle or missing control knobs and trim pieces, making authentic restoration difficult. This resource focuses on manufacturing new parts that precisely match the originals, ensuring period-correct repairs. The service offers a vast catalog of reproduced items, with thousands of molds created since 1987. This extensive inventory includes a wide spectrum of knobs and pushbuttons, along with some plastic escutcheons, grills, and handles. The meticulous reproduction process ensures that restorers can find accurate replacements for brands like Philco, Collins, and Atwater Kent, preserving the historical integrity of these valuable pieces of radio history. The owner, Larry Bordonaro, has been in business since 1987, demonstrating deep experience in this niche.

67 ft antenna for portable operation by VE3CLQ

AP Communications CB and Amatuer Electronics Sales

Comparison chart for low-band receiving antennas

Icom IC-7000 product review

CI-V OCX For The Icom 756Pro allow you to interface your own application or visual basic, excel, word or similar custom applications to your icom radio.

This is an incredibly simple and cheap frequency counter with binary readout, based on the ideas of Onno PA2OHH.

The Daily DX is a text DX bulletin sent via e-mail. To subscribe you have to pay for the daily or weekly subcription and you will receive DX news to your home or office by e-mail Monday through Friday, 50 weeks per year. Includes DX news, IOTA news, QSN reports, QSL information, a DX Calendar, propagation forecast and much, much more.

Morse Machine is a tool for learning to read Morse at a good speed, based on the Koch Method

Satellite Antennas for LOE Satellites

Problems using the tuner interface in the ICOM IC7000

YF1AR multiband vertical antenna, based on orginal concept by VE7BS. Consist of 6 vertical elements and 6 base radials with a single 50 Ohm feed line.

Pipe your signals to 146 and 445 MHz with one antenna!

This article provides a basis to brew your own emergency power pack depending on your needs and tastes.

DJ-X3 Memory Management Utility - Edit Memory Bank channels (700). Upload / Download, Load / Save Memory Bank channel data, Full / Partial Reset of radio.

Amateur Radio Memory Manager Software for the Mac support many Yaesu Icom AOR and Kenwood radios

Eham members product reviews of Icom IC-746

RigPix Database picture of the TS-850

AirNav live. See live images from my AirNav Radar box here in Clacton on Sea, Essex. Also full setup details.

Consoles, Recorders, Dispatch, Alerting, Paging, Monitoring equipment.

A 2W 80 meters transceiver assembled into a toaster case.

Operating on 160 meters from a city lot is always a challenge. Here's how K9YC does it.

5 elements Yagi antenna with an 8.7 db gain

Understanding Gain differences, j-pole and end-feed vertical antennas.

If you have space constraint at your QTH for a HF antenna, you can try contructing this HF magnetic loop antenna for 40-20 meters bands

Custom iambic paddles by N3ZN

Build An Inexpensive Repeater Controller from a Basic Stamp 1 or 2 By Roger Cameron

Basic tips for DXing

Adventures in amplified GPS antenna construction; an experiment

136kHz portable station project by PA4VHF Dick

Why twinlead isn't necessarily a low loss feed line.

Sounds of Space Weather by S. McGreevy, N6NKS

A group dedicated to the HF Kenwood Transceiver TS-590 S

Radio Scanning in Australia

This is a design for a stealthy HF multi-band vertical wire antenna using a tree as a supportby G7AQK

Cheap UHF antenna plans for 2 meters and up including 421 1296 and 902 Mhz

A 9:1 voltage unun using a T-200-2 powdered iron toroid core to feed a long wire multiband antenna.

Ham Start, starter kit. Stugy guides, resources, exams, upgrades and morse code. A guide for beginners and license upgraders, Resources for getting started and advancing in ham radio (USA)

This online guide details the microphone pinout for the Kenwood TR-7950 transceiver, specifically addressing the wiring configuration for a dynamic mobile microphone with a **500 Ohm** impedance. It provides a pin-by-pin breakdown for the 6-pin microphone connector, identifying the function of each active pin. The resource specifies that Pin #1 is for the microphone audio (white wire), Pin #2 controls the _PTT_ (black wire), Pin #3 activates the memory down function (blue wire), and Pin #4 controls the memory up function (red wire). Pin #6 is designated as the ground connection, while Pin #5 remains unused in this configuration. The document focuses on the physical wiring necessary to restore microphone functionality to the Kenwood TR-7950, a transceiver capable of **45 watts** output on the _2m band_. It directly addresses the technical challenge of re-establishing correct electrical connections after microphone wires have been disconnected from the connector. The information facilitates proper microphone operation for simplex QSOs and other voice communications. DXZone Focus: Online Guide | Microphone Pinout | Kenwood TR-7950 | PTT Wiring

Towers by Tashjian, Engineering, Design and Manufacturing

The Top-Rated Electrical and Electronic Engineering Calculator for Palm OS

A flex antenna working on 6m and 70cm by K0EMT

The G5RV multiband HF antenna, designed by Louis Varney (G5RV) in 1946, is a popular compromise antenna offering good overall performance on most HF bands when paired with an external antenna tuner. The basic full-size G5RV measures 102 feet across the top for 80 through 10 meter operation and is fed at the center via a 34-foot low-loss feed-stub. This interaction between the radiating section and the feed-stub facilitates matching across 80-10 meters with a standard tuner, often eliminating the need for ladder line directly to the shack. The antenna's design center frequency is 14.150 MHz, configured as a 3/2-wave dipole on 20 meters, with its 102-foot length derived from long-wire antenna formulas. Construction details emphasize the matching section, which can be open wire, ladder line (window-type), or TV twin lead. Each type has a specific velocity factor (VF) affecting its physical length for an electrical half-wave on 14 MHz; for instance, open wire requires 33.7 feet (VF 0.97), ladder line 31.3 feet (VF 0.90), and TV twin lead 28.5 feet (VF 0.82). The article provides formulas for calculating these lengths and discusses the antenna's behavior on individual bands, from 3.5 MHz where it acts as a shortened dipole, to 28 MHz where it functions as two three-half-wave long-wire antennas fed in-phase. Practical construction notes include recommendations for vertical descent of the matching section, sealing the coax junction, providing strain relief, and winding a coaxial choke coil to mitigate common mode current. The resource also presents dimensions for double-size (204 ft) and half-size (51 ft) G5RV versions, along with their corresponding matching section lengths for various line types, making it a versatile reference for hams considering this classic wire antenna.

Ham Radio repair of all major brands and models, located in Carrollton, Texas, which is just north of Dallas, and have been serving the Amateur Radio community for over 20 years.

Setting up a Raspberry Pi as Remote Server for RTL2832u SDR

TX3A online log for Chesterfield Islands 2009

FT-817 compared to FT-100 and review

A bowtie antenna is a type of antenna that reputedly provides higher gain at lower radiation angles than a center-fed dipole antenna at heights considerably less than 1/2 wavelength above ground.