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US Signal Corps BC-348

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überarbeitet am 27.6.2010

Single conversion, ZF 915 kHz

Analog dial

AM, SSB (BFO)

0,2-0,5 and 1,5 - 18 MHz

Sensitivity

Selektivity

Attenuator, AGC, Crystal Filter

The Signal Corps Receiver BC-348 is a eight valve superhet all wave receiver produced in the U.S. during World War II in many different variants; it has mainly been in use as airplane onboard receiver, that's the reason for the remarkably light aluminum chassis and cabinet.
The receiver is as 28 V DC variant of receiver BC-224-B for airplane onboard use; technically it's based on the BC-224-A 14-Volt version developed by RCA in the middle of the thirties and in some parts on the improved B variant.
The BC-348-B is powered by Dynamotor DM-28, it isusually mounted on a FT-154 / FT-167 shock mount. The receiver covers 1,5 - 18 MHz in six ranges.
In models from BC-348-E and later. the longwave / VLF beacon range of 0,2 - 0,5 MHz has been added, the band coverage 1,5 - 18 MHz is now covered in only five slightly bigger band segments.
In 1943, Belmont (Chicago IL) modified a number of BC-348-C for VLF reception, these sets habe been given the new type number BC-348-S.

All early variants BC-348-B and C have been built by RCA, they used a 41 as final audio tube.
The variants BC-348-E, H, K, M, O, P, R have been built by Belmont (Chicago, IL), in contrast to the early BC-348 - variants from RCA, they used a 6K6GT in the final audio stage.
The variants BC-348-J, N, Q have been built by Wells Gardner gebaut, in these sets, a 6K6GT is used as final audio amp, too; the sets from Wells Gardner can be recognized from the rotary knob to activate the BFO and from the lacking antenna tuner, there are some minor circuit changes.

Some of these seem to have been built (or at least overhauled) in France for use by the French armed forces.
Some sets with German lettering have been give to German authorities from war surplus, ofter having been overhauled and gaving got german language lettering, these sets have been used by German authorities (Police...), there exists a German language users manual.

© Martin Bösch