[Milsurplus] The Secret Wireless War

[radioman390 at cs.com]

 That tube lineup was from a CW Novice rig I remember from 1954. 
1. in wartime, most radio operations were banned (not marine service) so background noise levels were lower.2. CW was used almost exclusively except in air-ground-air comms and Africa desert war.3. highpower AM broadcasting continued on both MW and HF for propaganda, In fact many messages were hidden in newscasts or dramatic shows

The Secret Wireless War
 
 
 
-----Original Message-----
From: Kenneth G. Gordon <kgordon2006 at frontier.com>
To: Milsurplus <Milsurplus at mailman.qth.net>
Sent: Mon, Oct 1, 2018 2:16 pm
Subject: [Milsurplus] The Secret Wireless War

I recently bought this book and am reading it. What is truly amazing to me is that the main 
transmitter that SIS and their allied services used so successfully was their Mark III.

This was, apparently, built, or modified from, a design in some amateur radio magazine, 
possibly QST.

It consisted of a crystal oscillator/driver, most probably a 6V6, driving an 807 to a power 
output of about 25 watts (!!!), and into end fed antennas of poor efficiency.

Yet this simple transmitter was operated in conjunction with various receivers, most notably 
in many cases, the National HRO, in many, many stations, including diplomatic ones at 
consuls, and even mobile, all throughout WWII.

To me this means that the RECEIVING stations had to operate with unusually high 
efficiency with truly excellent operators.

I had thought that the transmitters used at, especially, consulates would have operated into 
excellent antennas and with powers of at least 100 watts and upwards.

Yet this was not the case.

I am amazed.

Ken W7EKB
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