[Elecraft] KX3 and KPA500

[w1az at comcast.net]

I haven't tried this (don't have an amp) but an errata sheet that came with my kit indicates that the keyline output is on the ring of the acc2 plug, not tip as indicated in the original manual. I don't think the ACC2 IO setting has anything to do with the keyline output, it's used for other control purposes. 

Bernie 
W1AZ 

----- Original Message -----
From: "Carlson David" <wa6dkn at gmail.com> 
To: elecraft at mailman.qth.net 
Sent: Sunday, June 10, 2012 1:34:24 PM 
Subject: [Elecraft] KX3 and KPA500 

Thanks Adrian for you advice. I did change the ACC2 IO setting to LO=PTT. The KX3 still will not key the KPA500 when I press the mic button. The KX3 goes into transmit but not the KPA500. I have the center wire from the KPA500 PA Key connected to the tip of the 2.5mm plug going into the KX3. If I reverse the lead on the cable (from the PA Key to the ACC2IO) the KPA500 does go into transmit without me keying the KX3. That is where I was before, I have to put the KPA500 into standby to receive and then put it into operate when I want to transmit. For your information I do use my KPA500 with my K3 and it works perfectly. I did discount the custom cable between the K3 and KPA500 when I connected my KX3 to the KPA500. 

Is there any setting on the KPA500 menu that I need to change? Any ideas? 

Thanks 

Dave WA6DKN 




> I can't figure out how to set the ACC2IO on the KX3 so that it will key 
the KPA500 properly. I currently have the >ACC2IO in the off position. When 
I connect the cable between the ACC2IO and the PA Key on the back of the 
KPA500 it puts >the KPA500 in a transmit mode. I have to manually put the 
KPA500 in standby to receive and then Operate to transmit. I >have tried a 
number of different settings on the KX3 and KPA500 with no success. What am 
I doing wrong? (incidentally >the KX3 will drive the KPA500 to almost 200 
watts output). 

ACC2 IO setting > LO=PTT (input; apply 0 V or ground to 

activate PTT) 
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