Which antenna port on the KPA1500 are you using? Port 2 is disconnected at power off.

That's one small nit with the amp, the antenna switch and tuner are on the same power source as the amp; all or nothing.  It takes getting used to, after being familiar with the KPA500/KAT500 combo.

73,
Rick NK7I

On 2/22/2022 7:13 AM, Dave wrote:
Bob

There has been a thread on the K4 groups.io on this subject. There is much
more info concerning the K4 on there. While mine works correctly, some
don’t. I think a pin needs cutting off, you might check with a breakout box.

73 Dave G4AON

On Tue, 22 Feb 2022 at 14:53, Robert Sands<[email protected]>  wrote:

My old cable, used with K3 and KPA500 works fine with K4 to KPA 1500
except the K4 receive is shut down when 1500 in off, regardless of cable or
use of interruptor. Ideas?

Happens Only on 40 and 75, not 20. No receive until 1500 is on. I also
tried the new cable.
Bob
K7VO

On Tue, Feb 22, 2022, 5:27 AM Dave<[email protected]>  wrote:

No difference between using the K3 and K4. I use the same interconnection
cable that I used for the K3.

The K4 shows the power level against the power control knob as appropriate
when you go from standby to operate.

Power setting/control with the K4 and KPA500 is well controlled.

73 Dave
K4D #286
KPA500

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