[ARC5] Info for VHF Transmitter

[DSP3]

The T-11 covers the lower aircraft band.  The T-13 will go up to 2m, 
as-is.  The harmonic number is different, of course, but very 
adaptable.  The T-21 has the 2nd deck mod and bank relay.  Beyond that, 
arguably the same unit.  If you have an ARC factory book, it sort of 
explains how to make a low split go high.  Also, and as I recall, to 
make a T-13 go low, a capacitive "cover" was added to the RF tubes.  I 
used a T-13B and an R-19 for a long time in CAP.  They don't sound bad.  
I still have the equipment but no longer used... wonder why?

Jeep - K3HVG


On 7/1/2017 1:20 PM, Cliff Miller wrote:
> Just bought an A.R.C. VHF transmitter marked T-21. There is no mention 
> of "ARC-5" on the label.  It has four 5763 tubes so must be similar in 
> design to the T-13A of the Type 12 radio set except it has 10 crystals 
> instead of 5.
>
> Any info or assistance in identifying this radio would be 
> appreciated.  I haven't found any manual or schematic or article on a 
> transmitter with this designation.
>
> My application for this is to pair it with an R-508 I have running.  I 
> have that cabled up to an old control box using information on the 
> R-19 from my Type 12 manual.  That works fine to monitor air traffic 
> passing by, LOL.
>
> My theory is that both of these are 50s radios rather than WW2, that 
> these may have been civilian service products.
>
> Another orphan I've adopted is a single receiver C-22A control box for 
> which I've found no information, either.  It worked with the R-508 in 
> a fashion, except the volume control worked backwards 
> (counter-clockwise = louder).
>
> Thanks!
>
> -- 
> Cliff Miller W4HGR
> cliff52 at gmail.com <mailto:cliff52 at gmail.com>
>

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