[ARC5] [Milsurplus] Scott SLRM - Low BFO Injection

[Bart Lee]

2 cents:

The SLR stood for Special Low Radiation.  Scott sold the Navy on the idea
that heterodyne oscillations could betray a ships position to a submarine.
(That *maybe* happened once in WW I as a result of a regenerative receiver
... but better safe than sorry, and rich on government contracts). Note the
full copper shielding on the SLR.

The BFO question is *maybe* related: another oscillator could inject RF and
*maybe* that RF could get out, *maybe*... So it would make sense to limit
the injection. (But I've never seen this aspect discussed and don't know of
any references).

73 de Bart, K6VK ##
-- --
Bart Lee K6VK, CHRS Archivist, AWA, ARRL

Texts only to: 415 902 7168

www.bartlee.com

{KV6LEE(at)gmail(dot)com} ##

<http://www.LawForHams.com>



On Mon, Sep 9, 2019 at 8:14 AM Hubert Miller <Kargo_cult at msn.com> wrote:

>
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net <
> milsurplus-bounces at mailman.qth.net> On Behalf Of Kenneth G. Gordon
> Sent: Sunday, September 8, 2019 7:44 PM
> To: milsurplus at mailman.qth.net; David Stinson <arc5 at ix.netcom.com>;
> aRC5 at mailman.qth.net
> Subject: Re: [Milsurplus] Scott SLRM - Low BFO Injection
>
> I have always thought the Scott receivers were excellent.
>
> One of the first such I ever had was an SLR-F....which was named the RCH
> by the Navy.
>
> The SLR-F/RCH covers some MF and lower HF frequencies, up to 24 MHz.
>
> I have two now, one of which is deaf, which I want to restore and use.
>
> They are excellent receivers, stable, reliable, not particularly
> sensitive, but sensitive enough.
>
> And I really like the flywheel tuning.
>
> The dial on your SLR-M looks almost identical to that in the SLR-F.
>
> BTW, if you don't know, the SLR stand for Super Low Radiation.
>
> Ken W7EKB
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