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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