[Elecraft] Re: K2/100 VFO cal problem - need help

[Wayne Burdick]

Tim,

Any deviation in the frequency of the 4 MHz oscillator will cause a proportional
error in the VFO and BFO frequencies (after doing CAL PLL and CAL FIL with a
given setting of C22 on the Control board). The VFO dial error will increase as
you go higher in frequency. I suggest you use the WWV calibration method for
setting C22, then re-run CAL PLL and CAL FIL afterward. This is covered in the
Advanced Operating Features section of the manual.

It should be possible to get the readings to within 10-40 Hz across all HF bands
if you follow the procedure carefully.

73,
Wayne


tlogan7@cox.net wrote:
> 
> Hi folks -
> My K2 is slightly off frequency. I know that my Icom 756PRO is exactly on
> frequency (be extensive zero beating etc with my Fists Code Buddy) - so I am
> trying to adjust the K2 to match the Icom exactly by listening to a 40m
> signal on the Icom narrowed down to a 50Hz filter width. Then I select the
> narrowest filter on my K2 and adjust the VFO for the strongest signal within
> that filter's width.  After adjustment the signal on my ICOM is at 7030.54
> and the K2 is at 7030.46. That sounds pretty close to me - but you folks may
> know better. The problem is that when I go up to 15m (for example) and do a
> similar comparison - I get a larger variation (and opposite direction)
> between the two rigs as in 21057.54 on the Icom and 21.057.74 on the K2. How
> can I get the variation on the higher frequencies to be closer to the Icom
> and how come the variation is not the same on all bands? Any help would be
> appreciated.