At 05:03 PM 12/2/2007, Don Rasmussen wrote:
Jerry pointed out:
"The biggest events I have seen are pretty important:
The reversed polarity of the ALC voltage (K3 ALC
polarity setup is not presently compatible with widely
used amps from Yaesu and ICOM" <snip>
I guess I have to leave you room for your opinion
Jerry, but it's a newly released radio and the
function you mention is working as engineered.
It's not like the radio is popping finals, has RFI
shielding problems, or "hangs" periodically.
No, Don. This is an issue that only affects the external amp. If a
PW-1 or Quadra gets in trouble due to, for instance, a flaky antenna
connection, it will attempt to shut down drive to itself by cranking
up the ALC voltage it sends back to the exciter. That tells the
exciter to reduce the drive level.
The exciter and the amplifier need to be able to communicate in a
"standard" protocol. Exciters that do not follow this protocol,
making it difficult for the user to interface it, may put the amps at
risk. The ICOM PW-1 and Yaesu Quadra operating manuals _require_ ALC usage.
I agree the K3 is probably working as engineered, but the engineering
does not conform to the requirements of widely-used amps.
I worry about these things because I once blew up the output circuit
of an AL-1200 because of a flaky antenna coax line. If that should
happen again with my present Yaesu Quadra amp I want the ALC line to
be working properly to give the Quadra a chance to survive the event.
Jerry W4UK
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