[ARC5] Tuning box

[Mike Hanz]

I never say never, but one would think that an R-31/ARC-5 would have 
been mentioned in at least one of the postwar ARC-5 manuals.  6 vac is 
also a reasonable and easily available test voltage for interphone 
operation.  There is no voltage present in the BC-450-A other than audio 
voltages, so it's unclear why the stamp would be on it if were not 
required for operation in some way.  Advisory stamps on mods to existing 
equipment, such as "Connected for 600 ohm operation" are common in US 
equipment to alert the technician to changes.  But that's all I can give 
you at the moment.

73,
Mike

On 6/15/2012 10:18 AM, BenG4BXD wrote:
> 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.
>
> -------------------------------------------------------------------------
> ----
> 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
>
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