RadioBanter - View Single Post

March 26th 04, 06:08 AM

in article , Frank
Dresser at wrote on 3/25/04 10:09 PM:

"Biz WDØHCO" wrote in message
...

[snip]
.

The E.H. Scott Morale Receiver is interesting in that it was the only
receiver made during WW2 where radiation from the local oscillators were
heavily suppressed.

Lots of receivers had dual pentode RF stages to minimize oscillator leakage.

Up to that point, the Germans learned to DF a convoy by
tuning into the signals given off by local oscillators. Some German subs
could detect these signals from as far as 100 miles at night.

I'd think that regenerative recievers operated by careless operators were
the real risk of giving a ship's location away. Detecting a normal superhet
at 100 miles seems iffy to me.

[snip]

Frank Dresser

This is fun! Well yea about the regen for sure - Some of those Superhets
leaked just as much. (Like a T.O. in a leatherette covered plywood box)

but think about this... middle of the ocean -
late at night -
100's of miles from anything -
floating around in a sub with everything turned off -

During a war under radio silence with just receivers turned on...

100 miles seems possible to me.