G'day,
Not really an issue. Get C22 right with the cover off and right away do
the cal pll before putting the cover on. After that it doesn't matter
what happens when the cover is replaced 'cos it has no effect whatsoever
on calibration.
Regards,
Mike VP8NO
| The cover on vs. off
Mike,
I don't have any measurement data to support it, but I do believe that the
oscillators (BFO, PLL, VCO) can be influenced by temperature and the
proximity of objects to the frequency determining components - the
difference should be slight, but could account for 10 to 30 Hz in the end.
Did you re-run CAL PLL, ** AND ** XFIL on ** ALL ** Modes (USB, LSB, CW,
CWR, RTTY, RTTYR)
** AND ** when running CAL XFIL you MUST change the number (up or down at
least on digit and then back to the same number) so that the MCU knows that
it needs to re-store the frequency settings for the
HOWARD W. ASHCRAFT, Jr. W1WF wrote:
Last night I redid my C22 reference oscillator adjustment using WWV on 10mhz
as the zero beat reference. This is the third time I have adjusted C22 and
each time I am able to adjust C22 to a precise offset balancing TP1 and TP2.
However, when I put the cover
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