[Elecraft] KPA1500 ... ATU tune cycle must be initiated manually since key line interrupter is installed

[dick at elecraft.com]

You might run a cable from the KPA1500 back panel TUNE connector to the K3 straight key input.  The KPA1500 pulls the tip of the connector low when it needs to do an ATU tune (because you pressed the ATU TUNE button, or we're doing an "swr-initiated" tune.  I use a 3.5mm TRS plug to plug (the green kind from lots of computer sound cards), and a 3.5mm to 1/4" stereo adapter that plugs into the K3 straight key line.

I may have missed the thrust of your question, but this is how I cause my K3 to provide carrier for ATU tuning when needed.

73 de Dick, K6KR




-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Don Butler
Sent: Wednesday, March 7, 2018 17:17
To: elecraft at mailman.qth.net
Subject: [Elecraft] KPA1500 ... ATU tune cycle must be initiated manually since key line interrupter is installed

I’m just getting to know my new KPA1500 and am having a ball doing so …. it is a gem!    one minor problem:  I’m using the key line interrupter in the Aux cable since I am keying through a microHam MK2R+ (the K3S/KPA1500 is one of two radios connected through the MK2R+ ….. so the key line must now run from K3 to MK2R+ to KPA1500).   Without the direct keyline connection between K3 and amp I must manually key the K3 to initiate an ATU tune cycle  ….  I suspect that the same problem would exist if I were using a KPA500  …. How have KPA500 users been working around this?

Don, N5LZ



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