[Elecraft] KPA500 Band Following

[Richard]

K3S - KPA500 - KAT500

A friend of mine who upgrades and repairs Elecraft stuff made me the two “15-pin” cables for band following. They work perfectly on his own K3S - KPA500 - KAT500 setup, both the tuner and the amp follow K3S band changes.

However, with the same cables on my setup, the tuner follows the radio, but the amp does not.

As an experiment, I plugged the cable from the K3S directly into the amp: still no band following.

Before I do any heavy lifting, can anyone suggest other causes and cures?

Cheers,

Richard Kunc — W4KBX