[FADCA] Low range and High Range UHF Mitreks - HELP!

[Dan Babilla]

Bud,

The best way of doing it is to send the Channel Element in to get the
crystal manufacturer to install the crystal in the element and to properly
temperature compensate it. And that is why I only buy ICM crystals!

The other way is to have a good de-soldering station  and a great selection
of Negative temperature co-efficient caps and other parts and do it by trial
and error or quicker by experience in doing it by trial and error.

Dan

BTW, I just got back in town and will get some time now to get the Clermont
switch in service.

----- Original Message ----- 
From: "bud thompson" <budt at cfl.rr.com>
To: "Florida Amateur Digital Communication Association"
<fadca at mailman.qth.net>
Sent: Wednesday, July 21, 2004 8:45 PM
Subject: Re: [FADCA] Low range and High Range UHF Mitreks - HELP!


> Oh... the good news is you are telling me my high frequency (450-512MHz)
> units will tune down to 430... but the bad news is you didn't tell me how
to
> make the compensation to the channel elements... What is the possibility
> that our crystal supplier did not realize I was using high frequency UHF
> Mitreks, not the low frequency ones (403-420MHz)?
>
> How do I solve this?
>
> What is the status of getting Clermont on FPAC?
>
> thanks,
> bud
>
> ----- Original Message ----- 
> From: "Dan Babilla" <dbabilla at earthlink.net>
> To: "Florida Amateur Digital Communication Association"
> <fadca at mailman.qth.net>
> Sent: Wednesday, July 21, 2004 20:03
> Subject: Re: [FADCA] Low range and High Range UHF Mitreks - HELP!
>
>
> > Bud,
> >
> > I have Mitreks on 430 mhz. I have not had an issue with making them play
> > down there. You have seen one of them personally, if you remember. I
think
> > your crystals need the proper compensation network component values. The
> > component values change in Channel element as you move out of band......
> >
> > 73's Dan KA0OXH
> >
> > ----- Original Message ----- 
> > From: "bud thompson" <budt at cfl.rr.com>
> > To: <fadca at mailman.qth.net>
> > Cc: "Andrew Czermann" <kf4atc at bellsouth.net>
> > Sent: Tuesday, July 20, 2004 1:02 PM
> > Subject: [FADCA] Low range and High Range UHF Mitreks - HELP!
> >
> >
> > Deltona
> > Tuesday July 20
> >
> > We are trying to tune some UHF Mitreks to 430.250 and 430.550 w/o Joy!
> >
> > We have a garage full of Mitreks and have tuned many to 440.nnn and
> 446.nnn
> >
> > The only UHF Mitreks we have include various chassis numbers all
> indicating
> > 450-512 Mhz range.  In the literature there are other Mitrek chassis
> numbers
> > that would indicate 403-420Mhz range.
> >
> > Must we have the 403-420Mhz range units to get one to retune to 430.nnn?
> >
> > (We get virtually no RX oscillator activity for 430.nnn with the units
we
> > have - is there a mode for these higher frequency units?
> >
> > For your reference here is where you can find a lot of reference info
for
> > Mitrek model and chassis models.
> >
> > http://www.repeater-builder.com/mitrek/mitrek-modnum.html
> >
> > Thanks for a quick response if you know for sure!
> >
> > bud N0IA
> > 386 574 4124
> > _______________________________________________
> > FADCA mailing list
> > FADCA at mailman.qth.net
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> >
> >
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