[ARC5] ARC-type-12 C-57 (used with R-22)

Mon Oct 15 18:26:09 EDT 2018

I'm not absolutely certain, but I believe we may have used AM broadcast stations for RDF (Radio Direction Finding) relative bearings/lines of position during that portion of my navigator training over the wilds of semi-deserted west Texas back in 1961.  IIRC, we had a multi-band RDF receiver in our T-29 (Convair 240) training aircraft at Harlingen AFB.  So I imagine it would have been possible to use a BCB ARC-12 for that purpose.

73 de Mac, K2GKK/5
(Since 30 Nov '53)
Oklahoma City, OK
USAF Retired (61-81)
FAA Retired (94-10)

________________________________
From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> on behalf of Richard Knoppow <1oldlens1 at ix.netcom.com>
Sent: Monday, October 15, 2018 17:15
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] ARC-type-12 C-57 (used with R-22)

    Is it possible it was for direction finding using broadcast
stations? A back up for other means of DF.

On 10/15/2018 1:48 PM, Mike Morrow wrote:
> Mike Hanz wrote:
>
>>  From the ebay example, it controls a .55 to 1.6MHz broadcast
>> band radio.  I'm not familiar with the postwar sets.  Is there
>> any postwar series that has such a receiver?
>
> There is only one exactly like that, the A.R.C. R-22 aircraft broadcast band receiver.  It covers 0.54 to 1.60 MHz just as its C-57 control panel shows in the ebay photos.  I found one NIB on ebay about ten years ago, complete with its matching serial number D-10A 28vdc dynamotor.  That surprised me because I did not think that A.R.C. shipped receivers with dynamotors installed in the same box.  Every one of several R-22 receivers that I've seen were marked on the name plate with information clearly showing USAF purchase in the 1958 era.  Here's what is on mine:
>
> RECEIVER. RADIO   R-22
> STOCK NUMBER 1600-013-424 345
> SERIAL NO. AF-58-1056 [my unit's serial]
> AIRCRAFT RADIO CORPORATION
> BOONTON   NEW JERSEY
> PART NO. 17610
> CONTRACT AF-33(600) 32467
> U.S.                28V
>
> The D-10A dynamotor has the same sort of information.
>
> So...the R-22 is a semi-unusual very late Type 12 receiver.  It has on its front only one 12-pin connector, BNC ANT, BNC LOOP, and TEL connectors, plus ANT trim capacitor and MC-215-type tuning spline connection.  The R-22 is not configured to work with a VHF transmitter system as was the common 1946-vintage R-10A 0.52 to 1.5 MHz receiver, which used three connectors on its front.  The R-22 is a slightly simplified R-10A with a very slightly different tuning range.  One wonders why the USAF was interested in a complete broadcast band tuning set in 1958.
>
> The only technical information I've seen is the schematic that Ken/W7EKB kindly sent me about ten years ago.  Ken must have some very late and scarce Type 12 manuals!
>
> Mike / KK5F

>

--
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL

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