[Elecraft] KX3 anomaly, birdie transmitted

[John Kramer]

I have a newish KX3 factory built. I just noticed something odd with my KX3. I usually use my
KX3 for portable use so its not often in the shack, but yesterday I had my Flex radio’s 
connected to my SteppIR beam on 15, and I hooked up my KX3 to an EFHW wire 
which is about 100 ft away from my SteppIR. 
With both the Flex and the KX3 in receive mode on 15 meters, I noticed on the Panafall
display of my Flex rig, that my KX3 is transmitting a birdie about 700 Hz below it’s RX frequency. 
When I turn the dial on the KX3 I can see it moving up and down the band on my Flex radio. It is quite
strong, about 70 dBm.

Is this normal ? for the KX3 to put out a “birdie” 700 hertz below it’s displayed RX frequency ?

73
John, ZS5J