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1K2 Packet Radio modem with BA758 – Circuit Schematic
1K2 Packet Radio modem with BA758
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KWM-2 and KWM-2 Transceivers – Circuit Schematic
KWM-2 and KWM-2 Transceivers
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Circuit RF Amplifier – Circuit Schematic
Circuit RF Amplifier
One of the best RF amplifiers ever published was Wes Hayward`s post mixer amplifier in the Progressive Communications Receiver. It quickly became known as a gre...
Push Pull Triodes for Class C – Circuit Schematic
Push Pull Triodes for Class C
The purpose of this document is to answer the question of why things are done in a certain way and why certain components are used instead of others. The circui...
TMB-1 Tri-Mode Buffer Amplifier Box – Circuit Schematic
TMB-1 Tri-Mode Buffer Amplifier Box
The TMB-1 is an RF amplifier unit / receiving accessory that can be used with a low-impedance broadband loop, a high-impedance terminated loop (such as a Pennan...
RF Circuit – Circuit Schematic
RF Circuit
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The EC10 communications receiver – Circuit Schematic
The EC10 communications receiver
One thing we should keep in mind is that the EC10 is now a vintage receiver, it has collector appeal. Any-thing we do should really be carried out in a manner t...
10 GHZ Transverter – Circuit Schematic
10 GHZ Transverter
A number of ham radio operators have made their start on the 10 GHz amateur band using commercial-surplus microwave transceivers made by M/A-Com. These units we...
144MHz All Mode Transceiver – Circuit Schematic
144MHz All Mode Transceiver
The main characteristic of the transceiver presented below is the simplicity, but in the same time giving good performance, with a minimum investment. The radio...
HF Transreceiver using NE612 – Circuit Schematic
HF Transreceiver using NE612
The inspiration for the project came after attending the HamRadio 2000, Millenium Ham Meet @ Hyderabad (December 22, 23 & 24) where I met Grand Masters like VU2...
80M CW QRP rig – Circuit Schematic
80M CW QRP rig
After some time of no building activity, the dark afternoons and less busy week-ends has come finally. Perfect time of the season to build a new rig. See what i...
FOUR BAND CW TRANSCEIVER WITH DIRECT CONVERSION – Circuit Schematic
FOUR BAND CW TRANSCEIVER WITH DIRECT CONVERSION
The performance of the 80 meter CW transceiver using the phase method for side band suppression is very good. Construction was easy with all good obtainable sta...
80 METER CW TRANSCEIVER WITH DIRECT CONVERSION – Circuit Schematic
80 METER CW TRANSCEIVER WITH DIRECT CONVERSION
The RF signal is split into two signals that are shifted 90 degrees out of phase (one plus 45 and one minus 45 degrees). Both are mixed to audio frequencies. Th...
An Audible Field Strength Indicator for Radio Direction Finding – Circuit Schematic
An Audible Field Strength Indicator for Radio Direction Finding
An audible field strength indicator (AFSI) lets you listen to changes in radio signal strength so that you can use your eyes to look for concealed antennas. Usi...
Yaesu FT-101 HF Transceiver – Circuit Schematic
Yaesu FT-101 HF Transceiver
The 6JS6C tube is a TV Deflection Tube, or "Sweep Tube". Although not meant for transmitting, it exhibits sufficient performance for RF operation through 30 MHz...
Homebrew RF Test Equipment and Software – Circuit Schematic
Homebrew RF Test Equipment and Software
This section will list several projects which will allow you to build your own RF design test equipment. Microwave construction techniques and basic electronic ...
GBPPR 1 GHz RF Spectrum Analyzer – Circuit Schematic
GBPPR 1 GHz RF Spectrum Analyzer
A RF spectrum analyzer is one of the most useful tools an experimenter can have. The spectrum analyzer project shown here will be a slight improvement on the " ...
13 GHz Frequency Counter Prescaler – Circuit Schematic
13 GHz Frequency Counter Prescaler
A fairly simple "divide-by-1000" circuit which was first designed by Zeljko Bozic, S52ZB, in a 2006 issue of VHF Communications Magazine. The idea of this proje...
Using the MC145158 PLL Frequency Synthesizer – Circuit Schematic
Using the MC145158 PLL Frequency Synthesizer
The Motorola MC145158 is a dual-modulus, serial-input PLL frequency synthesizer which is commonly used in older Motorola cellular phones. Refer to the MC145158...
Vacuum Fluorescent Device Regenerative Receiver – Circuit Schematic
Vacuum Fluorescent Device Regenerative Receiver
This little project arose from a desire to experiment with some of the more "traditional" methods of radioconstruction which enjoyed popularity some 70 years ag...