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Building equipment for AMSAT P4A geostationary Es'hail-2 Quatar OSCAR 100 Satellite -
The Doppler Effect allows the distance between a satellite transmitting from space and a radio receiver on the ground to be measured by observing how the frequency received from the satellite transmitter changes as the satellite approaches, passes overhead, and moves away. -
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Blog post about t he Yaesu VX-170 -
In this article the author shows the receiving loop antenna for 160 meters band installed at his QTH. Diagram and movie available. Article in in Turkish but can be translated in english -
Technical considerations about the Yaesu VX-1 -
WA8MCQ modification for the Heathkit HW-7 transceiver -
Collection of Telegraph Keys & related items -
The standard J-Pole antenna is a end fed 1/2 wavelength antenna, in this article is explained also how to build an expanded Super J Pole that provides about 4.5 dbd gain. These antennas can be built from EMT electric conduit pipe -
Software Defined Radio (SDR) for analog and digital modulation modes, can demodulate AM envelope, AM synchronous, AM stereo, LSB, USB, FM, FM Broadcast, DRM30, DRM+ -
RF Safety reource page with links and more documentation on radio frequency safety -
DTMF Keypad for radios without one. A project with picture and schematic diagrams to homemade a DTMF keppad -
50 Ohm Coax Antenna Power Splitter and Matching Network -
W6OPO report on Icom IC-7700 stress test to verify PA integrity under high duty-cycle usage -
Getting your Raspberry PI up and running your D-Star radio kit. This will work with DVAP / DVRPTR or DVmega -
The antenna almost repeat the design of the Car Antenna however instead of aluminum tubes it was used copper wire in plastic insulation in diameter of 2- mm (12 AWG). -
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The Maria Maluca HF multiband antenna as designed in 1957 by PY2BBP is a directive antenna for 15 meter and a passive element that works as director and reflector in different bands -
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A Kenwood TM-D710A microphone (Model MC-59) is producing crackling and intermittent, poor audio so John took a peak inside to have a look around. -
An experimental prototype of an asymmetrical hatted vertical dipole antenna that can work on HF bands 20 to 10 meters band. The AHVD Vertical dipole is an upside-down T design -
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FT-817 Information & answers to common questions including widebanding -
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TS-690 50 MHz modulation problem solved -
A schematic diagram of a homemade direct conversion receiver for 30 meters band -
The understanding of the A and K indexes will become a very important issue when one begins serious HF operation. -
Making a CW QSO by John Shannon, K3WWP -
A simplified explanation of decoding West German numbers messages transmissions without a computer. -
The mod requires an INRAD 45,705 MHz Crystal Roofing filter and the IC-765 add-in Board -
An Google Maps interactive layer showing Australian amateur radio repeaters. You can navigate and zoom as required and click on a repeater-site icon to display frequency, ctcss and other details and notes for that repeater. -
IC706_BKT CAT is used to control the transceiver Icom IC-706, IC-706MKII IC-706MKII/G and IC-718 from the personal computer. Works on Windows and is available in free and free donation version -
RadioMasterList, a comprehensive receiver and transceiver directory. Performances and specifications for every radio set -
The W0IS resource outlines methods for finding historical US amateur radio call signs, particularly for genealogical research. It highlights the comprehensive collection of digitized call books from 1906-1996 available at leehite.org, stored as searchable PDF files. These resources significantly simplify what was previously a laborious manual search through physical call books, which were typically indexed by call sign rather than name. The guide details specific search techniques for various eras. For early radio days (1913-1923), government call books are readily available and searchable online via Google Books and hathitrust.org. For the period between the 1930s and 1980s, when private publishers like "Radio Amateur Call Book Magazine" dominated, the resource points to archive.org for scanned editions (1938, 1940, 1948, 1972) that support full-text OCR searches, despite potential scanning errors requiring flexible search terms. It also provides strategies for navigating Google Books' "snippet view" for the 1952 call book, including searching by name or address and interpreting often illegible snippets. The resource suggests cross-referencing findings with hamcall.net for call sign verification from 1921, 1954, 1960, 1969, and 1983 onwards. Additionally, it lists physical call book collections at institutions like the Pavek Museum of Broadcasting and individuals like W3HF, offering avenues for deeper research when digital methods fall short. -
These antennas are larger versions of the small loop antennas that were part of the cardboard back panel of older AC/DC five tube AM radios. Loop antennas of this type were popular in the very early days of radio. They are still useful today for long distance reception of AM radio stations -
Wondering whether human body could be used as an antenna. -
HamGear.eu page about the FT-100, 160 to 6 meter bands plus the 144 MHz and 430 MHz bands transceiver from Yaesu. -
A DIY aluminium push up mast project. The final mast includes 7 aluminium tubes with 6 cable clamps -
Windows shareware contest log program for the CQ 160 meters contest -
K2Net is a remote operation windows software for the Elecraft K2, and allow remote control over internet or wi-fi networks by G4ILO -
This online calculator will give as output the Inductance L of a coil, including the total lenght of the wire needed to wound the coil. As input, requires the Diameter, number of turns, wire diameter and turn spacing -
An in-depth comparison here between the various digital technologies -
An article by microHam about guidelined to eliminate problems caused by RFI -
Electronic keyer by pressure sensor. SEN-09673 is used for detecting touch. -
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Table reference for serial ports commands supported by TM-D700A -
Original User Manual for the Baofeng UV5R -
A 12V powered, 4x15 Watt quad audio amplifier -
23 cm PA with Mitsubishi RA18H1213G
