[Elecraft] PLL Reference Oscillator Range Test

[David Cartwright]

Wow, thank you very much for such a quick response!

As it happens, I already have a 10uH choke installed, so I guess my
next step will be to contact electraft's parts department and ask if
they'll send me a 12uH choke to try.  Hopefully this will resolve the
problem.

Thanks again for your help!

David - VA7DMS

On 09/06/05, Giulio Pico IW3HVB <iw3hvb at arimarcon.com> wrote:
> David Cartwright ha scritto:
> 
> cut
> 
> >I'm currently measuring the range between the high and low frequencies
> >for the PLL Reference Oscillator.  As the manual states, I should be
> >getting a value between 9.8 and 15 kHz.  However, my actual measured
> >value is 8.94 kHz.  I've done the previous step, 4MHz Oscillator
> >Calibration, using an external frequency counter.  I've adjusted C22
> >to have the internal frequency counter match the external one.  Going
> >on to the next step, I measured the High frequency range on the PLL
> >Reference Oscillator and read a result of 12100.01 kHz, and a result
> >of 12091.07 kHz for the low range.  As I mentioned before, this is
> >only a 8.94 kHz difference.
> >
> >I've also checked over some of the previous posts on this group, and
> >have gone over some of the recommendations posted; specifically
> >measuring the voltage across D16 and D17, which was about 7.75 V
> >
> >I'm at a loss now as to what else I should try, or whether I am able
> >to move on and accept this value.  Any suggestions or advice would be
> >greatly appreciated.
> >
> >Thanks in advance,
> >
> >David - VA7DMS
> >
> >
> >
> Check if L31 (RF choke) is valued at 10 microH. If the answer is Yes,
> change it with a 12 microH one. This should solve the problem.
> Send an e-mail at parts at elecraft.com cause they are able to send you the
> replacement.
> 
> Happy Building.
> 
> Giulio IW3HVB K2#4681
>