[Elecraft] KPA500/KAT500 paired with AL-1500?

[Mark E. Musick]

Good question John.
You have to use the KPA500 KEY INTERRUPTER in this situation. It is attached
at the KPA500 AUX. The AUX cable goes from the K3 ACC to the KEY INTERRUPTER
that is plugged into the KPA500 AUX. If you have the KAT500 as I do the AUX
cable goes from the K3 ACC to XCVR on the KAT500 then an AUX cable from AMP
on the KAT500 to the KEY INTERRUPTER plugged into the KPA500 AUX.
Then to control each amp's keying I have a RCA Phono Y plugged into the K3
KEY OUT. One side of the Y goes to the 9500 KEY IN. The other side goes to
the KPA500 PA KEY or top RCA Phono PTT RLY connector on the KAT500 if you
are using a KAT500. Then a key line jumper from the bottom PTT RLY RCA Phono
connector on the KAT500 to the PA KEY on the KPA500.
When both amplifiers are powered up, the one not being used is in standby.
When in standby the amp will not be keyed.
I hope all that makes sense. If not, let me know and I will try and clarify
it.

Mark, WB9CIF

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
john at kk9a.com
Sent: Sunday, October 23, 2016 12:29 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] KPA500/KAT500 paired with AL-1500?

How do you control which amp's relay engages during TX? 

John KK9A

From: Mark E. Musick

I do this with my Alpha 9500. But differently than K9YC.
I use the two antenna ports on the K3 and an Alpha Delta 2 position switch.
Antenna one on the K3 goes to the KPA500 input. Antenna 2 on the K3 goes to
the 9500 input.
The output of the KPA500 goes to position one on the Alpha Delta switch. The
output of the 9500 goes to position two of the Alpha Delta switch. The
common of the Alpha Delta switch goes to the antenna switch. 
When I want the KPA500 the K3 is on ANT1 and the Alpha Delta switch is on
position one.
When I want the 9500 the K3 is on ANT2 and the Alpha Delta switch is on
position two.
Since the K3 remembers power by band and antenna, when I'm on the KPA500
regardless of band it has the correct power setting to give me 500 Watts or
200 Watts on 30 meters. When I'm on the 9500 the K3 has the correct drive
power for the 9500 for that band.
That is how I do it and it works for me.

Mark, WB9CIF

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