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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 -
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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. -
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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 -
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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 -
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 -
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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. -
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Signal Generator (VFO) with Direct Digital Synthesis by Bruce AA0ED and Craig AA0ZZ -
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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. -
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. -
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N5IW ideas to build your own antenna in a restricted lot, or a stealth antenna. Includes PPT files of HF and VHF stealth antennas. -
How to build a high gain vertical antenna for the UHF amateur or CB Bands, by radio experimenters handbook -
What is hallicrafters? Let these photos illustrate the soul of hallicrafters. by LA5KI -
2 Element Cubical Quad Antenna for 28 MHz by DL7JV in german -
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Several projects which will allow you to build your own RF design test equipment. -
One of the best antenna values on the market is the LightningBolt Quad. At about half the cost of a tri-band yagi, you get five band coverage with a single coax feedline and excellent performance from a light, low wind load antenna. -
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80m hexfet power amplifier by W7ZOI -
3 to 30 Mhz antenna analyzer schematic by YO3DAC / VA3IUL -
SerialKey is a Freeware DOS Morse code keyboard that uses the serial port, by Jeff Rowberg (KF6RLU) -
Faqs on six meters band, designed to help encourage hams to use and enjoy this band -
Simple, easy to built match developed in 1995 for Yagis with resistitive loads of 12.5, 18 and 28 Ohm. -
The DSP Satellite Transceiver is a conceptual transceiver designed as a dedicated unit for amateur satellite operators. The initial concept was brought about by the lack of satellite functionality on modern amateur radio transceivers, and the specialized requirements of the ham radio operator who utilizes OSCAR amateur satellites. -
An interface for amplifier to TS-850S -
Winding Toroids can be a real hassle for those of use who are left-handed or not so dexterous as we once were. -
Advanced QRP Low Cost Mosfets HF Linear Amplifier with schematics, IMD, gain data and more. Six articles about amateur radio. -
The purpose of this page is to capture and document the Yaesu FT-101 series radios during the 1970's -
Iambic keyer with simple paddles and simple electronic circuit. -
Amateur radio programs to download, locator , log, etc... for Psion Aprs maps for PC (ui-view) -
I4FAF etrode Tube Linear Amplifier experience