[VHFcontesting] Transverter Question

Eric Smith kb7dqh at donobi.net
Tue Mar 22 19:13:51 EST 2005

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...

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
> >_______________________________________________
> >VHFcontesting mailing list
> >VHFcontesting at contesting.com
> >
> >
> >  
> >
> 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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