[Elecraft] KPA500 band change problem

[Mark]

Hi

I run a Kenwood TS-2000, KAT 500 Tuner and KPA 500 amp.

In the last few months I have been having an intermittent issue with my
amp.  On some occasions when I have changed bands it will not follow the
band changes like the ATU does.  So if I am on say 14MHz and change to 7Mhz
the ATU changes antenna/band but the amp remains on 14Mhz.  Changing it
manually, changes the display on the amp to 7Mhz but the amp will not
operate on that band (or any other I subsequently change to).

Reinstalling the firmware (1.38) seems to fix the problem but every now and
then the same thing happens again without warning (although normally when I
am looking to work something I need the amp for quickly).

Has anyone else struck this and if so did you find a solution?

73

Mark ZL3AB