[ARC5] BC-453 in the SCR-274N Configuration

[Bart Lee]

"a switch that when pulled out set the radio to 276 Kc."

What was that frequency at the time?  A standard airfield A-N?

We have, at the CHRS Museum, a BC-1206 but not an R76-ARR-13.

Nice pix!

73

##
-- --
Bart Lee, K6VK, CHRS Archivist and Fellow, AWA Fellow, ARRL Liaison

Texts only to: 415 902 7168

www.bartlee.com

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On Fri, Feb 24, 2023 at 9:54 AM Mark K3MSB <mark.k3msb at gmail.com> wrote:

> The P-51 Pilot Training Manual dated 15 Aug 1945 mentions only the SCR-522
> (which makes sense as by that date it would have replaced the SCR-274N).
> The manual shows a Detrola LF receiver mounted on the lower right side of
> the cockpit.     “The Detrola is a low-frequency receiver.  It operates
> between 200 and 400 Kc, which covers the transmission band for towers and
> range stations through the United States.”
>
> I have no doubt that a BC-1206 could be used in place of the Detrola as
> visually they look to be about the same size.
>
> The BC-1206 was Setchell Carlson Model 524.   The Model 512 was the
> R-76/ARR-13.   It was similar to the 1206 but had a switch that when pulled
> out set the radio to 276 Kc.  See attachment.
>
> Another important use of the BC-1206 and R-76 was they were used for ferry
> flights from the factory to the facility that installed the radios.  It was
> a temporary installation.
>
> 73 Mark K3MSB
>
> On Fri, Feb 24, 2023 at 11:07 AM <releazer at earthlink.net> wrote:
>
>> Before WWII and even up until the 1970's to a limited degree, AN ranges
>> were used on low frequencies.  These featured signals that gave a
>> continuous tone if you were headed toward the station and an A (Dit Dah)
>> tone or an N (Dah Dit) tone if you were off to one side.  Light aircraft
>> without even an electrical system could use the AN ranges for navigation,
>> and also receive control tower instructions by employing battery powered
>> receivers.  Fighter aircraft generally did not have an ADF or even a loop
>> antenna and so were equipped with LF receivers for the same reasons.  When
>> SCR-522 replaced the SCR-274-N  or SCR-283 equipment small LF receivers
>> were often installed in the cockpit to preserve the LF capability, such as
>> the BC-1206 series made by Detrola, Setchell Carlson and others.  It is not
>> clear to me how often the BC-1206 equipment was retained for overseas use
>> or how USAAF fighters in the UK homed in on their airfield beacons.
>>
>> Postwar the BC-1206 was replaced with BC-453 in many refurbished P-51's
>> that had ARC-3 fitted and can be seen perched high above the ARC-3
>> equipment under the bubble canopy.
>>
>> Wayne
>> WB5WSV
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