[TenTec] Aligning Omni VI+ Freq "Jump"

[RICHARD ANDREN]

Thanks for the correct alignment procedure Bill.  One last question.  What 
are the frequency ranges of each of the four 10 meter sub-bands?

73, Rick AE9D
-------------
Original Text
From: "Bill Cook" <wdcook@ibm.net>, on 7/7/99 4:16 PM:

RICHARD ANDREN wrote:

> Hi Bernie,
>
> On my VI, the jump is also transmitted, but only on 10M for me.  If you
> find the fix, could you please forward any info to me?  I've spent 
hundreds
> of dollars trying to get TT to repair my VI since I bought it new six 
years
> ago.  They simply cannot repair it, but sure know how to charge me for a
> bad repair job like you.
>
> 73, Rick AE9D

Pin 11 on the phase-lock-loop chip on the logic bd. needs to be adjusted 
for
the narrowest possible  pulse width (50mhz or better o'scope).  The 
variable
"L" for each xtal osc is your adjustment (tweak).
Caveat:  The 20mhz oven ref osc must, must, I repeat must be stable (some 
of
them aren't) and right on frequency (+ or - < 5hz) (and how accurate is 
your
freq counter?)!!!

I have found when you put the cover back over the xtal oscillator section 
the
pulse width at pin 11 shifts ever so slightly.  I drilled
holes in the cover, one per adjustment, dabbed on a little water cure RTV 
to
keep the coil from moving and used a stiff non-metallic tweaking tool.

Of course you can ignore the above and just turn each coil 1/4 to 1/2 turn
either way and evaluate....If your symptom goes away,
great!

There are 10 coils to adjust for the 12 bands.  80 and 20; 17 and 10b each
share an xtal.

If your oven ref and BFO xtals are good, you can change the sprague goodman
variable caps (ie cheap but ok if you don't turn them much) to 
Johansan(sp?)
highly stable over temp piston trimmers available from Newark at around $15
ea.  I don't have the Newark # handy, but will look it up if necessary.

73 Bill  N4WC

PS  TenTec advertise the Omni VI to + or - 50hz.  I would like to believe 
mine
is + or - 10hz(it's close).

ö


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