[Elecraft] KPA500 Shifting Bands without any change in K3 Frequency

[Rick NK7I]

Have you tried putting the KAT500 into MAN mode (not bypass or AUTO)?  
Once trained for bands (memory loaded), MAN is the best way to use the 
tuner.  It'll recall the tuning combination but won't go into auto-retune.

73,
Rick nk7i


On 11/14/2022 6:00 PM, Joe Rogers wrote:
> I am operating the KPA500 KAT500 power combo with the K3.  The combination works great and normally makes frequency and antenna changes really simple.  I operate on MARS frequencies and normally all works just fine outside of all the amateur bands with the KPA500/KAT500/K3 there is, however, one frequency where there is an issue.
> When transmitting at about 4.5 MHz using SSB or digital modes, using the KPA500/KAT500/K3 combination, the band indication shoes the KPA500 spuriously shifting back and forth between 3.5 and 5.3 MHz bands.  This also affects the amplifier output power. I can also hear what sounds like contact/relay cycling.   This makes the combo unusable on this frequency.
> How can I resolve this problem so that the KPA500 is usable on this frequency?
> 73
> Joe AJ1Y
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