Search results

KF4SCI picture of a project for a VHF UHF jpole antenna working on 220 and 440 MHz.

5 elements "vee" log-yagi for 10m band- boom lenght : 4mt. Gain : over 10 dBd , f/b =over 40 db (deep null) f/b= min 20dB for different polarization signals

HF QRP Linear Amplifier with 2x 2SC2166 + 2x 2SC1969 Push Pull Transistors (13.8V)

The beam has only one feedpoint with 50 Ohm and has an open-sleeve element for 12 m by DK7ZB

A Parasitic Lindenblad Antenna for 70cm by Anthony Monteiro, AA2TX. This is the official 16 pages PDF File published by AMSAT about the 70cm Parasitic Lindenblad Antenna.

PDF resources containing information on low cost ssb,am,cw circuits, which are useful for beginners.

Coaxial cable loss in db per 100 ft.

Reports a 404 error, indicating the requested online receiver resource is unavailable. The page explains that QSL.net hosts over 30,000 websites, each maintained by different individuals, and suggests contacting the website owner directly or performing an internet search to locate the content. It clarifies that QSL.net cannot assist in finding specific missing pages or files. The page also notes that QSL.net provides email and web services free of charge to amateur radio operators and organizations. It encourages donations to support these services, providing a link to more information on how to contribute. The content emphasizes the need for user support to maintain the platform's operations.

antennas experiments by David Reid PA3HBB G0BZF

VHF Antenna in a lunchbox. The magnetic loop on two metres band Lloyd Butler VK5BR

A site devoted to Amateur Radio Homebrewing, CW-decoder, CW QRP Transceiver for the 40 & 20 meters band, CMOS reader

Over 20 years of development have gone into _Shacklog_, a logging software designed for radio amateurs and Shortwave Listeners (SWLs), primarily from the UK. This resource provides a detailed overview of its capabilities, which include real-time and post-event QSO logging, comprehensive log analysis and reporting, and the ability to print QSL labels. It also features a country status display, rig control integration, and supports importing existing logs, along with interfacing with CallBook CD-ROMs for callsign lookups. The software facilitates efficient management of radio contacts, allowing users to track their DXCC status and other awards. Its analytical tools help operators review their operating patterns and contest performance, while the QSL label printing function streamlines the process of confirming contacts. The integration with rig control systems enhances the logging experience by automating data entry, making it a practical tool for both casual logging and competitive contesting.

Yaesu FT 101 unofficial web site managed by NW2M

F6DED page of a 2 element beam W8LK antenna with pictures and dimensions, in french

Cross-Yagis for Terrestrial and Satellite Work The 2x6-El.-Cross-Yagi (28 Ohm, 2.60m Boom) by Henk, PA3GUO

Magnetic longwire baluns 1:9 combined with ground, a 1:2 and 1:1 balun connections by ON6MU

The Bazooka-antenna was developed by the staff of M.I.T. for radar use. The original Bazooka used coaxial cable for the entire radiating elements.

A small antenna for 2m and 70cm

The EZ QRA Locator softawre is a simple software for the calculation of QRA locators

SP5DDJ mini antenna tuner for QRP operations

Yaesu CAT Cable for FT-817 857 897

This little gadget is that it allows you to tune up at full peak output power, whilst limiting the average power to a fraction of the peak, thereby protecting the PA from meltdown

eQSLMaster is a HAM radio program, that allow to perform various functions using the Electronic QSL Card Centre (eQSL.cc). With eQSLMaster users of the eQSL.cc system have the ability to upload an entire ADIF format log file (or single QSO) and have it deposited into eQSL central database using LogServices.

Easy for calculate formula which could be a wake-up call for you. The SWR value at the input of antenna cable is not a actual SWR of your favorite antenna.

Web site updated several times per month. It covers all aspects of ham radio.

MC-50 microphone modification for high emphasis, connecto kenwood ts-50 to kenwood radios.

A vertical monoband that's small, light and portable, needs no counterpoise and performs as well as a home antenna

A shorten Dual-Band Dipole with overall length of about 11 m. For this antenna traps are substituted by inductors, in order to cover the 10 & 40 m. Bands.

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

40 meter transmitter by K9GDT

Freeware program, special and easy to use packet program for communicating with ISS, PCSat and other 'compatible' sats. Can also be used for basic normal packet.

Project by VE7GC

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

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.

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.

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

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

A VHF / UHF J-pole vertical antenna de ON6MU

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

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

PA2OHH portable regenerative receiver

Schematic for a DIY 70 cm vertical antenna

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

Cancelling out unwanted noise sources by DL3FP

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.

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

The slim-jim antenna for 144 MHz

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

Ham radio humor and stories

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.