G8AEV 2 Metre Converter Mk2
A VHF 144MHz in, 28MHz and others out
This Transistor Tuner/Converter described below was a good and cheap way
to listen to the 2mt band back in the late1960’s early 70’s
Designed by the late John Hartley, G8AEV who passed over October 2005, it’s a
very good design with only a few sprog’s and what there present are of a low level and even
by today’s standards its sensitive and well ahead of its time using FETs for a quite a low noise output.
Back then most Amateurs operated on the HF Bands, with Top band (160Mts
- 1.8 to 2.0 MHz) being used as 2 Metres is today as the local chat Band, so all Hams had an HF receiver .
The cheap way to receive 2 metres was to connect a 2mt in, HF out,
converter to the Ariel input to
your shacks HF receiver and listen away
2mt AM, and FM (using slope demodulation) could be resolved and also SSB
to, if your HF receiver had a BFO, AM was the norm back then as few Hams had SSB equipment.
The Manual G8AEV 2 Metre Converter
Page 1,
Page 2 including the circuit
Page 3
Page 4
Note
TV manufacturers in the late 60’s were in the changeover from Valve (tube)
front ends in their TV receivers to the new RF Bipolar transistors which were still in their infancy, so the use of 40604 duel gate Fet with a 100 MHz conversion
gain of 23 dB typ, was indeed
revolutionary
Source:- My own collection
Donated by a very good friend, now sadly silent key G0DQO Bill
Donated by a very good friend, now sadly silent key G0DQO Bill
