[ARC5] Tuning box

[BenG4BXD]

Interesting Mike but I don't think the yellow markings on the rx and 
identical markings on the tuning box refer simply to a resistor.

As the ARC5 series is R-23 to R-28 my guess is its R for receiver, a 
modded set, that is now given the R-31 number.

As the tuning box also says "6V AC" then it could be a system designed 
for 6V ac rather than a dc supply.

cheers, Ben.

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Subject: Re: [ARC5] Tuning box
On 6/15/2012 6:30 AM, BenG4BXD wrote:> I have a rx as well with R-31 on 
it in yellow so come on chaps, what> does it mean?If I had to guess, it 
would be a load or bridging resistor added to the audio output to 
correct volume levels for the interphone system, Ben.  R-31 is 
unassigned in my version of the SCR-274N manual, so it's a possibility. 
  I have a Navy Aircraft Radio Maintenance Note for the ARC-5 that adds 
a similar resistor, but of course it doesn't cover a piece of (ugh) 
Army trash. :-)   The note is at 
http://aafradio.org/docs/Console_type_controls.pdf for those 
interested.73,Mike