andy@aids-unix.ARPA (Andy Cromarty, N6JLJ) (01/17/86)
I have a BC-348-R Signal Corps military surplus receiver. I have been going crazy trying to find a schematic for it, or at the very least, what kind of power and where to apply it to get it working. Please don't let this noble rig go to waste. If my memory serves me correctly, about 15 years ago the ARRL publication "Understanding Amateur Radio" contained a detailed description of the WWII ARC transmitters and receivers, including fairly complete specifications on how to rebuild them for improved performance. I believe it included details on converting the recevier to be a superregen, which improves selectivity substantially. I think it also addressed the power supply problem -- these sets typically needed unusual DC voltages, normally supplied by dynamotors, as noted by N2XS. Unfortunately, the contents of this ARRL book changes in each edition, so current copies do not contain this info, but a large local public library may have a copy from 1970 (plus or minus a few years) containing the conversion info for surplus WWII equipment. (By the way, I think those issues of UAR were among the best books on ham radio ever written -- the credit goes to George Grammer of ARRL, if I remember correctly.) good luck & 73, Andy N6JLJ