[Elecraft] K2 - frequency control

[Don Wilhelm]

Nick,

First, check RFC15 on the bottom of the RF Board to see if it is open - 
check it with an ohmmeter, the voltage will read 5 volts on both sides 
of the inductor even if it is open.

Once you have determined that RFC15 is not the problem, do CAL PLL again 
- be certain the bottom cover is in place during the process.  After a 
CAL PLL, the clicks should be substantially reduced.

Note that such clicks are rarely possible to eliminate completely, but 
if the PLL is working and tracking properly, the level should be so low 
that they are not noticeable under normal circumstances.  The 5 kHz 
intervals are where the PLL range switches from high to low, so when the 
PLL DAC values in the EEPROM are correct, tracking willl be very close 
and the clicks almost not audible.

Since you are near high power broadcast stations, you may find that 
radiation from those stations will sometimes pull the PLL and the clicks 
may be more difficult to eliminate, especially on the high end of 40 meters.

73,
Don W3FPR

Nick Henwood wrote:
> I have just started to notice a click and a very small jump in frequency every 5 kHz on my K2. For example I find it on 30M:
> 10105.78
> 10110.78
> 10115.78
> 10120.87 (etc)
>
> on 40M it appears:
> 7034.3
> 7029.93
> 7024.93 (etc)
>
> Is this something that has always been there which I have just noticed ? I can work round it but would prefer not to. As usual I run the risk here of exposing my ignorance so please be kind if the answer is obvious!
> 73 Nick G3RWF
>