[ARC5] Set designation - Air Force SCR-274N sets in black

[mac]

What's the question.....?

Dennis D. W7QHO
Glendale, CA

***************

On Feb 10, 2011, at 10:27 PM, Leslie Smith wrote:

> Hello Group,
>
> This is a re-hashing of that perpetual question.  My question is  
> based on a statement made by Ray Robinson (VK2ILV) who has an  
> impressive collection of military gear.  (Lovely bloke, from  
> Wahroongah, NSW, Australia)
>
> Here is Ray's statement:
>
>  "The Command set is a general title for several groups of receivers  
> and transmitters used in World War 2, which are more specifically  
> called the (United States Army Air Force) SCR-274N, (United States  
> Navy) ATA/ARA, and the (United States Navy) AN/ARC-5. They were used  
> for Air to Air, Air to Ground communications and for receiving  
> Navigation signals. They are a unique design of that era, in that  
> most radios would use a band switch to change to a different  
> frequency band, whereas this design selects a completely different  
> receiver or transmitter. Here is more complete list posted by W6RIC.  
> After the war, they were still used. I have one that was used in  
> Australian Civil Aircraft which was reconditioned in 1956."
>
>  "The Army SCR-274N series radios were available in black wrinkle  
> paint, or natural aluminium finish. The Navy ARC-5 were in black  
> wrinkle paint. Externally they looked identical in appearance, and  
> only differed in colour and frequency coverage. Internally they were  
> very similar, with only minor differences, apart from the obvious  
> ones relating to the frequency. The SCR-274N series had BC-454 type  
> names and the ARC-5 had R-25 and T-20 type names for the receivers  
> and the transmitters. The adapter drawer on the front had a  
> different knob and label for Army and Navy. Some of the low  
> frequency receivers had a different antenna connection so that a  
> loop aerial could be connected. The circuits were almost the same,  
> with only a few small changes because of the frequency coverage. The  
> valve line up was the same, except that some ARC-5 receivers used a  
> 12SF7 second IF valve instead of the 12SK7 which was more common.  
> Here is a list of differences compiled by Ray Mote."
>
> End of notes by Ray Robinson.
>
> "The Army SCR-274N sets were available in black wrinkle paint or  
> natural aluminium finish"
>
> Comments (with supporting argument if available) received with  
> interest.
>
> Thank you,
>
> Les Smith
> formerly VK2BCU
>
> -- 
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