Mike, I am having the same trouble on a vhf low band mitrek. But
I can not see which cap to take out. I tried to check all the traces to
see if there is a cap in parallel but I can not see them. Do you have a
pictures showing which are the two caps? Thanks.
Larry KB8VUM
Mike Morris wrote:
> The only time I'll recrystal an element is if it's not going on a hilltop.
>
> That said, look inside the element and see if there is a fixed cap
> in parallel with the crystal. If there is one, remove it carefully and
> measure the freq again. It will probably be just right.
>
> If you found two caps, and removed both, it will probably be too
> high, and you need to put one back. In the 8 Mitrek TX elements
> I've recrystaled I've found a mix of none, one and two caps. The
> ones with two caps have always been too low and needed one
> removed. The ones with none I've sometimes had to add one.
>
> Your mileage may vary.
>
> Hot tip: be very careful in removing the caps - if the caps get
> too hot they "sweat" - they get real shiny with some kind of a
> fluid on the surface - and the caps get unstable and the elements
> end up drifting. I've had to replace the "sweated" caps with red-dip
> silver micas to cure the drift and those caps are getting hard to find.
>
> And if anybody has traced out the schematic of a Mitrek TX or RX
> (or both)element I'd love to have a copy of the schematic to put on
> the Mitrek page at www.repeater-builder.com
>
> Mike WA6ILQ
>
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