[VHFcontesting] Transverter Question

[Eric Smith]

Or, if that is where the rock wants to oscillate, and any
attempt at netting frequency  stalls the oscillator, or,
provides insufficient oscillator output, then "tune for
maximum smoke" and stick a 3x5 card on the IF with the
error in frequency noted and live with it...  BE CAREFUL...
I aligned the rest of an MMT 220 transverter with the
oscillator barely running, and did indeed let the smoke out
of a following amplifier stage, by tuning it to the point
of oscillation.  It now has a metal film resistor with no
paint left on it, but, it still functioned when I got the
real problem ( the weak oscillator) fixed.  
Good luck...
Eric
KB7DQH


On Tue, 22 Mar 2005 18:57:45 -0500
 WBR/WF4R <wbr at verizon.net> wrote:
> KA2AEV at aol.com wrote:
> 
> >Backround
> >Microwave Modules 220 Transverter Crystal changed to
> accomodate 222mHz
> >
> >Problem
> >Frequency is off by about 5kcs  from the IF Frequency
> >
> >Does anyone know how to make the IF frequency match the
> transverter 
> >frequency???
> >
> >73 de Mike
> >KA2AEV
> >_______________________________________________
> >VHFcontesting mailing list
> >VHFcontesting at contesting.com
>
>http://lists.contesting.com/mailman/listinfo/vhfcontesting
> >
> >
> >  
> >
> I'd be willing to bet there is a small variable capacitor
> in the osc to 
> tweak the xtal freq.  There should be a way to measure
> the L.O. 
> injection freq just before the mixer stage.  Using a
> calibrated freq 
> counter simply set the L.O. on the correct freq.
> You did not say what band you're using for the IF.
>  Assuming 28 MHz IF, 
> the L.O. should be 194.000 MHz. Good luck.  73, Bill,
> WF4R
> 
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