Radio Direction Finder
The HANDI-Finder ® is a HANdheld DIrection Finder which can be used to localize both AM and FM carrier-based sources using a single connection to the antenna i...
Fox Hunting
This is a new gear for Radio Direction Finding (RDF) known as FOX HUNT or called Transmitter Hunting (T-Hunting) or Treassure Hunting. HAM clubs, all over the w...
Icom IC-751 (IC 751 IC751) transceiver mods reviews software and diagrams
The 751 required turning the volume control almost to 12 o`clock before getting any hearable volume so I thought maybe something was wrong here. I replaced all ...
N6EX Receiver Mods
This page identifies all the hardware modifications necessary to adapt a Kenwood TK-931 transceiver for 902 MHz repeater receive operation. Not shown here is th...
N6EX Exciter Mods
This page identifies all the hardware modifications necessary to adapt a Kenwood TK-931 transceiver for operation as a 2 watt exciter for 927 MHz repeater servi...
Build Basic Radio Frequency Electronic Circuits
AM radio receivers receive or demodulate amplitude modulated (AM) signals. The most common source of these signals is of course todays Standard AM Radio Broadca...
Low Power Amateur Radio
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Micore Reader IC Family Directly Matched Antenna Design
How to design an antenna for the MICORE contactless reader IC family. (The MIFORE reader IC family includes the MF RC500, MF RC530, MF RC531, SL RC 400 and the ...
Telegraph Transmitter in the Pilot Radios Radio Design magazine 1930s
TPTG transmitter was transformed into a trendy TNT. You can use your present K-111 power pack for this transmitter as well as for the receiver, and thus save th...
A long-wave SWR meter
This document describes a simple SWR-meter suitable for long and medium waves bands (137 and 500kHz). The design is nothing new and very similar to common short...
A simple AM modulator
An AM modulator for the MW band that will allow hearing the music of a CD or MP3 player during daytime on such radios. This is not a transmitter: the output pow...
The Tayloe Mixer A Low Noise Solution
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APRS GPS Controller
the Yaesu FT-7900E (radio)`s power status to guide the power status of the GPS and Tracker would be ideal - this doesn`t require any additional cabling and, if ...
472 kHz Transmitter
The exciter board is based on my Arduino WSPR exciter. I do plan to create a better stand-alone board soon, with one of these Chinese DDS modules that are cheap...
Armstrongs superheterodyne radio
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How I built a shortwave Armstrong FET regenerative receiver
I had never worked with " common base" or "grounded base" designs before and you know, I still don`t understand how they can amplify. Another thing, I had never...
Philco Portable
It is a hansom battery portable radio with a roll top and even today it looks beautiful. When I was first given the radio it didn`t work. It had a burned out de...
the Poppet 500 milliwatt AM transmitter
The Poppet" is a half-watt AM transmitter designed by Mr. Doug Gibson of England. The original design was published in issue 84 of SPRAT, newsletter of the GQRP...
VHF/UHF TV TRANSMITTER PLL
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Genesis G59 Software Defined Radio Transceiver
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