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Morse Machine is a tool for learning to read Morse at a good speed, based on the Koch Method -
This is an incredibly simple and cheap frequency counter with binary readout, based on the ideas of Onno PA2OHH. -
A re-usable control & computing platform for antenna measurement, PSK31 digital modems, audio filtering, signal source & VFO, memory keyer by AMQRP -
Paddles made from readily available materials, like double sided PC board material and cost almost nothing to build. -
Adventures in amplified GPS antenna construction; an experiment -
6m (50Mhz) Long wire antenna There is another form of long wire antenna which provides uni-directional coverage and is easy to build. Description by Arnie Coro CO2KK -
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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) -
Build An Inexpensive Repeater Controller from a Basic Stamp 1 or 2 By Roger Cameron -
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. -
Modifications for the Kenwood TS-940, TS-940S LCD Clock Display Erratic Operation, Talk Power Improvement, erratic display, ALC mod -
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An interesting homebrewed gamma match feed for a Halo Antenna -
Shortened vertical antenna for 40 meters band an homebrew project -
My MMPRINT utility is a post contest tool that lets you extract statistical data from a CT log file -
Make your own interface, two schematics for building an interface using the RTS line by N3UR -
FREE specialized software in the detection and registration of echoes radio products by meteors shower, falling star, at the time of their gone in atmospheric. They are destined to all possessors of a radio and a computer, interested parties by this simple technique of radioastronomy. -
Free memory backup/restore program for the Yaesu VR-5000 receiver. -
Offer a wide range of homebrewing projects mainly for VHF UHF operations. From vhf antennas to preamplifiers, chargers and power supplies -
Although a magnetic loop antenna(aka small loop antenna) is very compact, its efficiency is close to a half-wavelength dipole if carefully built. -
allows a Macintosh computer to communicate via packet radio with the amateur packet satellites currently in operation using the 'PACSAT' protocols -
This homemade tube oscilloscope is based on the WaterMan Pocket-Scope 0510A, a 3 tube oscilloscope made in 1946. -
This program expedites the design of lumped-element diplexers using both the lowpass/highpass and the bandpass/bandstop topologies. -
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The Smith Chart was originally created many years ago as an RF engineering aid by Phillip Smith of RCA.These pages includes extesnive documentation on smith carts. -
Utility program to verify, merge, and sort standard 2-line orbital elements files -
7N3WVM homebrew project of a 3 W output CW transceiver on 7 MHz band -
The KA7OEI FT-817 pages, customizing/accessorizing the FT-817 -
A vertical monoband antenna design that can work from 6 meters to 70 cm by F5ZV in French -
Building an Open Source Arduino APRS Tracker with LCD & GPS ( SVTrackR ) -
Beaconmap is a Win95/98/NT program to help listeners to identify the beacon stations of the NCDXF/IARU beacon network. The program displays a flashing dot at the location of the beacon that is currently transmitting. The call sign of the beacon, as well as the QTH is shown in the status bar. By PA1ARE -
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This program extracts statistics from a dx.dat file to show numbers of spots for each country on each band -
This is the table of contents to a list showing how the radio frequency spectrum is allocated to different users in the United States. -
Need to interface both a TNC and the computer soundcard? This is a ICOM 756PRO ACC1 audio/keying/FSK interface by WA0SXV -
At the moment the most used program is UA1AAF. It is an excellent program written by Boris, UA1AAF, to handle ARI International DX Contest. It can simulate K1EA or N6TR workings; it will be possible to connect the RTX to the computer using a standard interface in such a way as to transmit directly in CW from the keyboard; most of the controls are like K1EA's CT and N6TR's TR ; on line help provides almost all the information necessary for using the program. Is possible to insert QSO after the contest. An appropriate utility in included for conversion in ADIF format. The program is very small and therefore works without any problems on any IBM compatible computer with DOS 3.3 and over or Windows 95/98. -
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A circuit which had been used in many other application before. The configuration described here is optimized for IPHONE/radio operation. -
This article explain how to homebrew and use an HF antenna analyzer by simply adapting a Windows PC, micro-controller and a DDS evaluation board by K6BEZ -
This software allows your PC to connect to the Universal Radio M-8000 Decoder through its serial port in order to get and save the decoded data but also to send commands to the decoder. -
The digital wattmeter project was created for the purpose of measuring power in the range of 300nw to 30w. -
A project of a bobtail-curtain antenna for 10 MHz -
A javascript online calculator of bearing and distances by G4VWL -
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20 Watt Power Amp for Softrock or for QRP transceivers by M0RZF -
A Contestpedition Cable for TR-Log and the IC-706 by K6XX -
The Olivia transmission system is constructed of two layers: the lower, modulation layer is an (almost) classical Multi-Frequency Shift Keying (MFSK) and the higher layer is a Forward Error-Correcting (FEC) code based on Walsh functions. -
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