G8AEV 2 Metre Converter Mk2

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