[ARC5] Purpose For Scott Receivers
Rich Post
kb8tad at gmail.com
Fri Mar 8 22:38:22 EST 2019
Hi Liles,
Yes, that is true. Here's some info on my Scott SLRM
<https://people.ohio.edu/postr/bapix/SLRM.htm>
World War II era Navy Morale receiver, AC-DC, 12 tubes. General coverage
from 540 KHz to 18.6 MHz in four bands.
The Scott is a fine example of radios built to Low Radiation standards.
During World War II, fears of submarines being able to home in on radio
signals emitted by a receiver's local oscillator and I.F. resulted in
well-shielded receivers built with RF amplifiers to further isolate the
oscillator and mixer from the antenna. The RF amp tube is in a
separately-shielded compartment (visible on the right-center side of the
chassis next to the IF transformers on the right).
Whether the receivers, other than the more common regenerative types found
in some older ships could actually be detected by subs beyond visual sight
is debatable. Another more real concern was to avoid interference with
sensitive on-board direction-finding equipment.
The National RAO series were built with an extra shielded RF amp and were
limited to emission of no more than 600 picowatts out of the same concern.
Rich KB8TAD
On Fri, Mar 8, 2019 at 6:02 PM landn2 at frontier.com <landn2 at frontier.com>
wrote:
> Good afternoon Everybody,
>
> I have a few of these old Scott receivers. I even have one
> with its original spares kit. Weren’t these radios made
> especially to have a low external radiation level from
> local oscillators and/or BFO oscillators? The thought back
> then was that our ships and subs could be located by any
> radiation that come from onboard radios. I don’t know if
> this is true or not—but there were a lot of those Scott
> receivers out there.
>
> Everybody have a great weekend!!
>
> Best regards from Aloha, Oregon,
> Liles Garcia
> landn2 at frontier.com
>
>
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