Quote:
Originally Posted by trh01uk
Certainly the design of the BC-375 is starkly crude, with VFO feeding directly into 4 PA valves in parallel. The so-called MOPA layout. The performance is correspondingly crude, these sets being known for terrible chirp on CW. All one can say about them is that they were "good enough" most of the time. And we won't know about the times when they weren't good enough - those sets were probably lost along with the plane and crew.
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Not quite, One VT4C was used as oscillator and another as PA.
The other 2 VT4C's are used as modulator amp's.
A VT25 was the LF pre-amp or modulating tone oscillator ( MCW ).
The transmitter was capable of CW, MCW and AM putting out something like 35 Watts carrier depending on which band it was used.
Indeed a early 30's design but with a correct power suppy stable enough for the purpose it was used in, short messages from aircraft to ground.