According to Ken Corwin, KF6NUR (SK?), from his 16 Dec 1998 paper:  
https://web.archive.org/web/20120221010321/http://nj7p.org:80/history/bc-348.html

"The BC-224-A, -B, -C, and -D; and the BC-348-B, and -C, tuned 1.5-18 mc in six bands. The Signal Corps had the receiver design modified to add a 200-500 kc band and compress the 1.5-18 mc coverage into the remaining five bands. This modified design became the BC-224-E and the BC-348-E. The 200-500 kc and 1.5-18 mc tuning range remained constant for subsequent production of all models. 

In 1943, the Signal Corps (or RCA) had Belmont Radio remanufacture some of the RCA-manufactured BC-348-Cs to include the 200-500 kc band. This remanufactured receiver became the BC-348-S. While the BC-224-A used a BD-94-A (14-V) dynamotor and an FT-154 mounting, all the BC-224-B/BC-348-B and later receivers used DM-24 (14-V) and DM-28 (28-V) dynamotors, FT-154 (lettered series) and FT-167 mountings, PL-P103, PL-Q103, and PL-Q103-A plugs."

Regards,
Jim


Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy


On Thursday, June 22, 2023 at 02:59:56 PM CDT, Robert Downs via Milsurplus <[email protected]> wrote:


Fairly early in WW-II the Army Air Corps quit issuing the 5-band BC-348’s that did not cover the LF

band below 500 KC because most of the aircraft equipped with the BC-348 were going to parts of the

the world where many of the airports were not equipped with HF equipment.  The Army Air Corps quit

installing the early model BC-348’s in most of the bomber fleet.  I have never seen this mentioned in

official documents but there must have been a significant quantity of un-issued BC-348-C’s on hand

and someone decided to convert them to 6-band units which got the model BC-348-S assigned.  This

was not repeated so either it didn’t save much money or there weren’t enough unissued A, B or D models

to make it worth doing. 

 

 

Robert Downs

 

From: [email protected] [mailto:[email protected]] On Behalf Of RODNEY HOGG
Sent: Thursday, June 22, 2023 13:30
To: Milsurplus
Subject: [Milsurplus] BC-348-C (S)

 

After several posts on the BC-348 and modifications, I have a question.  I have a 

BC-348-C made by RCA and has another tag, "modified by Belmont, BC-348-S".

From what I can determine the modification was done to add the LF band.  Was

anything else done?  Haven't been able to determine what all it entailed.

It has been further modified to include an AC power supply and an added

meter, "S"?  Came from engineering lab at state university.

Just curious. Any help?

I also have a BC-348-P by Stromberg-Carlson.  It is complete with H/B

built in power supply.   Both will be put on my auction soon.

 

Rod

K0EQH

 

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