Hi Simon I use K3 with K144XV and K144RFLK with an external 10MHZ GPS locked signal adn have done so for 9 months or so now. I have never seen this characteristic you describe. I can leave it on GB3VHF beacon using JT65 / WSJT and it stays rock steady at 3Hz discrepancy all day long. I have never noticed any jumping you describe. 73 Roger - GW4WND
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