Alignment an Test Part2 problem with PLL reference

[Michael van Hauten]

Hello togehter,
today i run into a problem with K2 #4691.
When running CAL FCTR to align the 4 MHZ i always get a frequency reading of
about 12014 instead of 12090.
In the next step, the pll-range is only 9.04 mhz. What could be wrong?  Is
this a problem with X1?
Thank you for your help.
Michael, DC0ZO

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[Don Wilhelm-3]

Michael,

You cannot actually use CAL FCTR mode alone to align the 4 MHz oscillator.
Your frequency reading of 12014 may be because the 4 MHz oscillator is not
yet adjusted.

First set C22 to its midpoint (slot perpendicular to the flat side).  Then
use one of the 3 methods shown on page 60 of the manual to set it closer.
At this point, the accuracy of the 4 MHz reference is not really critical.
You can and should set it more accurately after you have the full receiver
working and can tune to a known standard frequency.

A 9.04 MHz PLL range will be fine, but did the high frequency reading show
anywhere near 12100 kHz?  It should be at least that high for proper
operation.  If it is lower than that, you likely have a problem with the PLL
Reference oscillator (check the thermistor board carefully for errors and
solder bridges - that is a common source of problems with the PLL).

73,
Don W3FPR

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]]On Behalf Of Michael van Hauten
> Sent: Thursday, February 03, 2005 5:27 PM
> To: [hidden email]
> Subject: [Elecraft] Alignment an Test Part2 problem with PLL reference
>
>
> Hello togehter,
> today i run into a problem with K2 #4691.
> When running CAL FCTR to align the 4 MHZ i always get a frequency
> reading of
> about 12014 instead of 12090.
> In the next step, the pll-range is only 9.04 mhz. What could be wrong?  Is
> this a problem with X1?
> Thank you for your help.
> Michael, DC0ZO
>
> _______________________________________________
> Elecraft mailing list
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> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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