[ARC5] AN/ARC-3 ?

[Jim Haynes]

On Fri, 22 Jan 2016, Michael Clarson wrote:

Yes, it was an autotune system.  Which means it was preset by a technician
rather than automatically finding resonance like Really Modern stuff.
There were only 8 channels of the autotune in all the models.  The
models having more channels simply had the ability to switch between
2 or 3 or 4 crystals for each of the original 8 channels.  So the
frequencies in any one of the 8 channels had to be close enough together
that the equipment was not seriously out of tune whichever crystal was
selected.  Each of the 8 channels had to be pre tuned to a compromise
among the several crystals which could be selected for that channel.

> Jim: I don't know about the ARC-3 rcvr, but the transmitter autotune would
> retune the entire transmitter. All stages were ganged together, motor driven
> and tracked, and there was a relay that sensed a TUNED condition. --Mike,
> WV2ZOW
>