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Includes EH antennas, 7Mhz vertical monopoles, 5 elements vee log-yagi for 10m and more

Tuning control of the Yaesu FT-736R multiband VHF/UHF transceiver.

40 meter transmitter by K9GDT

Gi7b is tube designed for microwaves but working good as HF amplifier. Idea is to build cheap, reliable HF amplifier covering 160 meters band.

Schematic for a DIY 70 cm vertical antenna

Project by VE7GC

PA2OHH portable regenerative receiver

Details a practical QRP wattmeter construction, leveraging a simplified SWR meter design by JA6HIC. The project focuses on a forward-only power measurement circuit, providing a functional instrument for RF power levels from milliwatts up to 5 watts. It maintains a 50-ohm input and output impedance, suitable for typical QRP transceivers and antenna systems. The resource includes the schematic for the "VSW" (Very Simple Wattmeter) and outlines a six-step alignment procedure. This calibration process involves using a known RF source up to 5W, setting full-scale deflection, and marking power increments. It also addresses minimizing frequency effects on readings with a 100pF trimmer capacitor, noting that measurement error is highest at the lower end of the scale. Construction notes mention using a piece of RG-213 coaxial cable for the inductance and coupler, with the wattmeter assembled in early 2003. The author provides an example measurement showing 0.8W into a dummy load and 1W into a 3-element beam.

The function of the calculator is to give all of the needed sizing to construct a good 5 element quad antenna for amateur radio use.

A 14 elemets yagi antenna for 432 MHz based on DK7ZB design

Two element X-Beam is a high-performance broad-band antenna that is ideal for Ham radio operators with limited space. X-Beams are inexpensive and easy to build. The performance of the simple X-beam is amazingly similar to larger, more conventional antennas by 4S7NR

BesserNet Reflectometer is a fun SWR calculator and simulator Java applet

VK2ZAY end-fed antenna for 40 and 80 meter band

On 23cm the best way to obtain a good RX-sensitivity is to use a GaAs-FET in the front-end, since these devices show very low noise figures.

A Moxon rectangle antenna for 17 and 20 meters band

A VHF / UHF J-pole vertical antenna de ON6MU

A 3500kHz - 3579kHz range transceiver, output 250 mw by SP5DDJ

Elmers Forum at eHam.net about the Yaesu handhelds radios VX3 VX6 VX7

Circuit and software to build a beacon keyer, includes downloadable packages.

All about amateur radio, police scanner frequencies. Frequency Listings for Kentucky, West Virginia, Virginia and others. Add your URL to the Scanner Link Page.

G3YCC article pn the W3EDP end-fed antenna for 80 to 20 meters bands

The AMers nets from HF to VHF

The slim-jim antenna for 144 MHz

This antenna is very useful for receiving or scanning purposes, but you can use it for transmitting, too. It is 2,94m long and has a pi-configuration (Collins-Filter) for the matching.

A list of frequencies for ham radio operators QRP operation and with a special reference for those using the Fireball 40 a multi-band QRP TX kit

Using the TS-2000 for packet and digital modes. How to connect the Kenwodd TS2000 to TNC

Cancelling out unwanted noise sources by DL3FP

Interesting review about active magnetic loop antenna Wellbrook ALA 1530 and 330S by ON4SKY

Signal Generator (VFO) with Direct Digital Synthesis by Bruce AA0ED and Craig AA0ZZ

A standard 6 elements design scaled for UHF application. All material used in this project are easily obtainable tubes and rods which is limited within a total budget of $18.

Descriptions for 144-MHz- , 70 MHz- and 50-MHz-Reflector-Hentennas

Small parts and kits for the QRPer

Demonstrates CW Decoder Logic, a freeware application for Windows Vista SP2, 7, 8, and 10, designed to decode Morse code signals. The software incorporates an optimized 80 Hz DSP filter, enabling reception of CW signals across a speed range of 5 to 60 WPM. Key features include automatic signal tracking within a 3 KHz range, real-time speed detection, and an auto squelch function, enhancing decoder sensitivity and accuracy. The application provides station selection directly on a waterfall display and includes a "Tips" feature for word annotations. It supports sending decoded text to external logging software via UDP protocol, with a logger source code example provided for developers. Configuration options allow users to set speed limitations and customize interface elements. Released initially on October 17, 2016, with subsequent updates, the program requires Microsoft .NET Framework 4.5 or higher. Changelogs detail improvements such as increased program stability, code optimizations for speed, and fixes for display issues across different Windows versions.

Ham radio humor and stories

If you find external wire antennas obtrusive for amateur radio or short wave listening, then this is the antenna for you, is just 1 meter diameter

These yagis and groups were designed with YO7.23 from K6STI and checked with EZNEC from W7EL. With a gain of 14/17/20dBd they have a good relation between gain and mechanical problems.

2 meter or Dual Band J-pole bicycle antenna

Elelement yagi beam antenna for 2 meters band by ON6MU

How to build a high gain vertical antenna for the UHF amateur or CB Bands, by radio experimenters handbook

Easy circuit that provide good gain to weak audio signals

homebrew an helix antenna for 435 MHz by VE2ZAZ

N5IW ideas to build your own antenna in a restricted lot, or a stealth antenna. Includes PPT files of HF and VHF stealth antennas.

2 Element Cubical Quad Antenna for 28 MHz by DL7JV in german

A coaxial cable tuneable magnetic loop antenna for 7MHz. This experimental antenna does not require a tuning capacitor

What is hallicrafters? Let these photos illustrate the soul of hallicrafters. by LA5KI

Here is the parts list and dim. sheet for a 6m Square Copper Dipole, made from copper water pipe

Tunes symmetric/coax/longwire antenna's between 1.8-50MHz

Operating amateur radio satellites effectively requires precise knowledge of their orbital mechanics and pass times. Gpredict, a real-time satellite tracking and orbit prediction application, addresses this need by allowing operators to monitor numerous satellites simultaneously. It displays critical data such as position and pass details through various visualizations, including lists, tables, maps, and _polar plots_. Unlike many other satellite tracking programs, Gpredict introduces the concept of visualization modules. These modules enable users to group satellites and configure each group independently, offering unparalleled flexibility in how orbital data is presented. This modular approach supports tracking satellites from multiple observer locations concurrently, which is particularly useful for stations with diverse antenna setups or remote operations. Originally a GUI client for John Magliacane's _Predict_ program, Gpredict evolved to integrate its own tracking code for improved performance. The software is distributed under the GNU General Public License, ensuring it remains free and modifiable for the amateur radio community.

Several projects which will allow you to build your own RF design test equipment.

Classified ads at eham dot net. Buy and sell your second hand amateur radio equipment