[ARC5] Purpose For Scott Receivers

[Christopher Bowne]

The Scott super low radiation receivers were used in both merchant marine and Navy applications.  The merchant marine, such as those used in the Mackay radio systems on Liberty ships carried the civilian model numbers such as SLRM SLRF and SLR12B.  The same sets used on Navy ships were given Navy model numbers.  For example the entertainment receiver SLRM was tagged as the REE.  They made a large number of RBO entertainment receivers for the Navy.  There may have been more than one on a ship, typically one in the crew’s mess, one in the wardroom, and sometimes on larger ships, one in the Captain’s stateroom. When I first took a tour on the USS Nautilus SSN571 museum historic ship, there was an RBO in the crew’s mess, although It was not there in later years.

 My first real HF radio was an SLRM given to me by my grandfather in 1964.  Used it with a DX-40 as my Novice station in 1967.  It’s still working well 52 years later, I often use it when operating on our Old MilRadio CW net on Sunday nights at 2100 Eastern time on 3570.

I also have a working RCH and RBO, all great radios. The RCH is a very good CW receiver. They all have great AM audio quality.
 
The super low radiation characteristics of the Scott receivers was heavily promoted in their ads in such magazines such as National  Geographic during the war. 

73 de Chris AJ1G
Stonington CT

Sent from my iPhone

> On Mar 8, 2019, at 22:38, Rich Post <kb8tad at gmail.com> wrote:
> 
> 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
> 
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>> 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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