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 


{Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}



On Fri, Feb 24, 2023 at 12:52 PM MARK DORNEY <mkdorney@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@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 


{Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}



On Fri, Feb 24, 2023 at 9:54 AM Mark K3MSB <mark.k3msb@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@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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