AMATEUR RADIO CIRCUITS

AF Filter / Amp. and Sidetone Generator

(click to enlarge)

Transceiver Circuits

This page contains circuit diagrams and construction notes for various projects including Amateur Radio Tranceivers (for VHF and HF), solar and wind power regulation and links to pages with other electronic circuits.

Transceiver IF Strip

TRx IF Strip (click to enlarge)

Click to enlarge layout; guage size when printing using 0.1" pitch for IC1

TRx IF Strip (click to enlarge) This circuit is designed for use with standard 10.7 MHz xtal filters, the 9 MHz xtal filter available from G-QRP Club or a homebrew filter in the 4 to 21 MHz range, using individual xtals. It features a novel bi-directional amplifier at each end of the filter which performs impedance matching to the filter, Tx-Rx switching and of course amplification. There is also some on board audio filtering. various mixer types are possible, but need to be bi-directional ( eg SBL-1) if the IF strip is to be used as a transceiver.

Last updated 6th October 2006. 73 de John G8SEQ