Hi Bob,

My KPA500 is in the basement as will be the KA1500. I used to have an Acom 
2000A alongside the KPA500. I have a switch in the shack that selects the one 
output from the K3 to an A/B switch for the inputs of both amps and an A/B 
switch on the output for both amps to a coax switch. I key the amps in parallel 
with diode isolation. This has worked well for a long time. I like doing it 
this way because while the one amp is off I can use the other amp.  If I have a 
problem with an amp all I have to do is turn off the one amp from the screen, 
turn on the other amp and hit the switch. I don’t have to go to the basement to 
do anything.

Guess I can use a Y-cable with a second KPAK3AUX with both amps in parallel 
instead of the Y-Box. 


N2TK, Tony


From: rawil...@gmail.com [mailto:rawil...@gmail.com] On Behalf Of Bob Wilson, 
Sent: Monday, February 12, 2018 3:48 PM
To: N2TK, Tony <tony....@verizon.net>; Elecraft Reflector 
Subject: RE: [Elecraft] Y-Adapter for K3S ACC - KPAK3AUX - KPA-1500


If you want to connect both amplifiers to the same K3, one on Antenna Port 1, 
the second on Antenna Port 2, just connect a second KPAK3AUX cable between the 
KPA1500 and the Y-BOX. But the K3 will key both at the same time if they are 
both powered on, and they will both be on the same band, and only one will 
receive RF from the K3.


If all you want to do is swap the KPA500 for the KPA1500, all of your existing 
cabling to the Y-BOX and KPA500 will work exactly the same since they are 100% 

Bob, N6TV


On Feb 12, 2018 12:26 PM, "N2TK, Tony" <tony....@verizon.net 
<mailto:tony....@verizon.net> > wrote:

What about if you have the earlier Y-Box and have a KPA500 on it already?
How do you add the KPA1500?
N2TK, Tony

-----Original Message-----
From: elecraft-boun...@mailman.qth.net 
<mailto:elecraft-boun...@mailman.qth.net> ] On Behalf Of Bob Wilson, N6TV
Sent: Monday, February 12, 2018 2:50 PM
To: elecraft@mailman.qth.net <mailto:elecraft@mailman.qth.net> 
Subject: Re: [Elecraft] Y-Adapter for K3S ACC - KPAK3AUX - KPA-1500

On Mon, Feb 12, 2018 at 11:41 AM, j...@kk9a.com <mailto:j...@kk9a.com>  
<j...@kk9a.com <mailto:j...@kk9a.com> > wrote:

> Don't use VGA products.  Elecraft sells a Y adapter that will work
> perfectly and N6TV sells a Y-Box to connect up to four devices to the ACC.
> John KK9A

Correct, plus with the new version 2.1 Y-BOX, you don't have to purchase a
KPAK3AUX cable to connect the KPA1500.  A $10 MF 15-pin cable (not a VGA
cable) will work fine because the internal wiring of the Y-BOX v2.1 matches
the Elecraft custom cable wiring wiring.  It also adds a feature so you can
power up the KPA1500 remotely with a K3 macro (something not supported by
Y-adapters with an unmodified KPAK3AUX cable).

See https://bit.ly/Y-BOX

Bob, N6TV

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