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

Fri Feb 24 18:50:08 EST 2023

Re  ARR-1 and ARR-2:

We have at the CHRS museum an ARR-1 in an original box, NOS. We open it up
from time to time so that visitors can smell what WW-II fungicide smells
like.  The maritime museum in Barcelona features several olfactory displays
for careful sniffing:  Pirate ship bilge water, decaying hemp rope, etc.
That museum said that people, when downwind, could smell a pirate ship
before they could see it on the horizon.

Our ARR-2 is in a triple rack, along with a LF ARC-5 and a BCB ARC-5
waiting power, antennas etc. AND CONNECTORS.  Alas, there's not much going
on in the ARR-2's frequency range ~~ 230 > 260 Mhz.

73 de Bart, K6VK ##
-- --
Bart Lee

Texts only to: 415 902 7168

www.bartlee.com

{Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}
<http://www.lawforhams.com/>

On Fri, Feb 24, 2023 at 12:52 PM MARK DORNEY <mkdorney at aol.com> wrote:

> The USN used the ARR-1 ( ZB-1,ZB-2,ZB-3 ) and ARR-2 starting in the 1930’s
> to guide aircraft back to carriers after a mission. The ARR-1 types were
> used withe the RU type receivers, the ARB Receivers, and the ARA and ARC-5
> type navigational receivers until replaced by the ARR-1 was replaced in the
> ARA-ARC-5 receivers by the ARR-2 starting in 1943  The ARR-1 was fit to
> either the ARA/ARC-5 ( and SCR-274 ) by receivers using several control
> boxes and a mount separate from the ARA/ARC-5/SCR-274 receiver. The ARR-2
> eliminated the need for the separate control boxes and separate mount in
> the ARA/ARC-5/SRC-274 receivers. The ARB receiver also did not use the
> separate control boxes for the ZB-1 homing  device and the deceive itself
> clipped onto the top of the ARB receiver, as it did with the RU type
> receivers.  The Antenna on the YE transmitter on the carrier rotated, and
> sent out a different Morse code letter every 30 degrees of rotation using a
> “U” shaped directional antenna ( the “Hay Rake” ). The signal was modulated
> in such a way as to make the signal undetectable unless you had the correct
> receiver set correctly. Declassified in 1947, the system stayed in use by
> the USN until 1960 when it was replaced by VOR and TACAN.
>
> Mark D.
> WW2RDO
>
> “In matters of style, float with the current. In matters of Principle,
> stand like a rock. “.   -   Thomas Jefferson
>
> Sent from my iPhone
>
> On Feb 24, 2023, at 3:22 PM, Bart Lee <bart.lee.k6vk at gmail.com> wrote:
>
> 
> "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
>
> {Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}
> <http://www.lawforhams.com/>
>
>
>
> 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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