[Elecraft] K2: VFO clicks/pops in the presence of strong signals

[Sverre Holm]

>  I hear clicks/pops (about
> S-5/6) when the VFO transitions the following boundaries:
> 
> 7015.79/80 (click/pop getting very weak here)
> 7020.79/80
> 7025.79/80
> 7030.79/80
> 7035.79/80

Such clicks about every 5 kHz is normal and is part of the construction
of the PLL/VFO-system of the K2. Let me see if I can explain it. The
reference oscillator of the PLL is based on a 12 and something MHz
crystal, with a variable division ratio following it. However, these
steps would be way too course, and therefore the crystal is pulled by
varicaps over about 5 kHz between every change of division ratio. The
pops you hear is when you are the end of the pulling range, and the
divisor changes and the varicap voltage goes to the other end of the
pulling range.

--
73, 
Sverre

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Sverre Holm, LA3ZA
www.qsl.net/la3za