Dr. Gerald N. Johnson wrote:
The main contributions from Collins in WW2 were the ARC-2 and ART-13.
The ART-13 covered LF and HF, PA an 813 modulated by a pair of 811.
It had ten mechanical presets that could be anywhere in its range.
...and those motor driven mechanical presets gave the radio its
nickname, "The Coffee Grinder". It did NOT run quietly -- but when you
were on a B-29, I guess 'noise' was relative. As a snot-nosed kid in the
early 60s, I built an HV and 28VDC power supplies to run it on the ham
bands and it was fascinating to watch the thing tune. Even operating it
was noisy. As I recall, when you were on CW, it keyed everything, up to
and including the antenna relay. A LOT of clattering. I finally got rid
of the radio because I couldn't run the thing after my parents went to
bed. :-)
Carter K8VT
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