The KPAK3AUX cable also switches the KPA500 band prior to transmit when you
change bands on the K3/K3S. If the cable is not present, the amp will still
change bands instantly upon transmission from any rig by measuring the
frequency, including the K3/K3S. Either method works well.
The KPAK3AUX cable also contains the AMP KEY signal, eliminating the need for
the RCA PTT cable.
If the KAT500 is also connected via the aux cables between the K3/K3S and the
KPA500, them KPAK3AUX sends frequency information from the K3 to the ATU to
select sub-band tuner segments prior to transmission.
The KAT500 will also interrupt the AMP KEY line in the KPAK3AUX cables during
tune.
73,
Eric
/elecraft.com/
---
On 8/15/2016 10:39 AM, Jim Brown wrote:
On Mon,8/15/2016 10:28 AM, Don Wilhelm wrote:
Are you attempting to use the band decode lines on both the Icom and the K3
at the same time?
That will cause problems unless there is some kind of isolation provided.
And remember that the KPA500 does NOT need band information from the rig -- it
reads frequency with a short burst of RF and switches to the right band. So
does the KAT500. Just hit a dit or tap the mic. The only interconnection that
is NEEDED is the AMP KEY line.
The only thing that a full AUX cable adds is that it allows you to push
buttons on the KPA500 to make the K3 change bands. I don't use an AUX cable,
just RCA-RCA for AMP KEY. During contests, I do that with N1MM. Outside of
contests, I use the rocker band switch on the K3.
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