[Elecraft] K2 PLL Range

[John Heaviside]

Yes!  Thanks Jessie.
A small movement of the RIT pot and the PLL Osc range BAND+/BAND- worked
with stable reading except when RIT was full +ve.
I am still a little concerned as the + reading is 12099.1 and the - reading
actually 12078.4 so the range is over 20kHz and well outside the specified
9.5 to 15.
However, the VFO linearisation then worked OK and after that the PLL osc
range test also worked with the RIT fully +ve!  So I don't think it was a
scratchy pot.  Something in the software?

Will continue with construction!

Regards,  John. G3NYX


----- Original Message ----- 
From: "Jessie Oberreuter" <joberreu at moselle.com>
To: "John Heaviside" <John.Heaviside at care4free.net>
Sent: Thursday, November 11, 2004 10:36 PM
Subject: Re: [Elecraft] K2 PLL Range


>
> Did this solve your problem?  Mayhap it was a different pot?
>
>
> On Wed, 10 Nov 2004, Jessie Oberreuter wrote:
>
> >
> >     I had this problem when I was first building my K2 a few years back.
I
> > was scratching my head for hours.  Finally put a logic analyzer on the
bus
> > and found the problem: I believe it was the RIT control -- every time a
> > change was detected, the MPU would snap the VFO back.  For some reason,
mine
> > was a little scratchy or was otherwise wandering around by +/- 1 and it
was
> > enough.  I fiddled with it a bit and everything was fine.  I meant to
make
> > sure I didn't miss a step in the manual saying to rail the control,
and/or
> > post this experience to the reflector, but I don't think I ever did.
> >
> >
> > On Wed, 10 Nov 2004, John Heaviside wrote:
> >
> >> PLL Reference Oscillator Range Test (page 57 of manual).
> >> The 4 MHz osc has been calibrated to an external counter with known
> >> accurate reference.
> >> In CAL FCTR the counter reads 12099.15 MHZ
> >> Tap BAND+ there is no change to this reading.
> >> Tap BAND- the reading briefly changes to 12079.?? (too fleeting to read
> >> decimals) and instantly reverts to 12099.15.
> >
>
>