[ARC5] SCR-287 Receiver Spotting.

[Michael Hanz]

It's shown in Figure 8-43 of TO 12R2-2ART13-2 (Typical Wiring Diagram 
for Radio Set AN/ARC-8).  Would that be official enough? :-)

- Mike  KC4TOS

On 9/28/2020 11:03 AM, J Mcvey via ARC5 wrote:
> The switch in the second "flight deck" picture looks like an 
> "innovation" rather than a official part of the system.
> Is the switch included in the official  SCR-287 system manual?
> Interesting...
>
> On Monday, September 28, 2020, 9:35:22 AM EDT, David Stinson 
> <arc5 at ix.netcom.com> wrote:
>
>
> Having a hard time finding what I did with my
> SCR-287 documents box.   The switch used to
> keep the 348 "live" during transmit was designated
> a "Monitor" switch.  It was usually installed right
> next to the 348, though you find them placed
> in small panels as well- seems to have been a
> "where ever it ain't in the way" decision from
> install to install.  Most of the B-17 recreations
> of Radio Op positions omit this switch
> (and just about everything else).
>
> Pins 21 and 22 on the PL-64 are a NC contact
> on the keying relay, designated "Receiver Control"
> or "Key Relay" depending on which diagram
> you have.  This contact removes high voltage
> from stages in the 348 to provide muting.
> The "Monitor" switch shorts this pair to
> keep the receiver alive during transmit
> for netting.
>
> Here's a couple of poor pictures of original
> installations and one of my SCR-287.
> In one, the switch is just right of the 348.
> In the other, the switch is mounted on a
> small panel to the left.  My 287's switch
> is on a panel up and right from the 348.
>
> https://photos.app.goo.gl/igfRP5nNA3qgxBxj6 
> <https://photos.app.goo.gl/igfRP5nNA3qgxBxj6>
> https://photos.app.goo.gl/9MmdTBj7gTWGzFbM9 
> <https://photos.app.goo.gl/9MmdTBj7gTWGzFbM9>
> https://photos.app.goo.gl/psX8aBR52PfDcsNN9 
> <https://photos.app.goo.gl/psX8aBR52PfDcsNN9>
>
> 73 Dave AB5S
>
>
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-- 
Michael Hanz - KC4TOS

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