[ARC5] Altitude Adjustments

[Robert Eleazer]

I had always assumed that the automatic altitude power adjustment used on transmitters like the ARC-3 was designed to reduce range of transmissions both for OPSEC and interference reasons.  The idea that the purpose was to reduce arcing makes sense.

The standard Hi-Pot test required something like 550 V insulation resistance.  This was a problem for some integrated circuits, so we sometimes used an alternate instrumentation specification that required a test to at least twice the operating voltage and I think not less than 125 V.  The IC's could handle that.

The ARC-27 addressed arcing problems by sealing the radio in an airtight case and running cooling air through a layer of the outer case with a blower.

Wayne
WB5WSV

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