Painting eliminates the shielding properties of the metal?
Joe M.
Neil McKie wrote:
>
> The Mitrek top cover is painted ... and won't provide good shielding
> because of it.
>
> Neil - WA6KLA
>
> Mike WA6ILQ wrote:
> >
> > Usually if the covers are in place, that won't be a problem
> > (the Mitreks are built in a pretty tight housing) but if it is,
> > then the solution is in my Mitrek Interfacing writeup - just
> > bump one to the alternate 10.8mhz IF (but he will have to
> > re-order the RX rock, or tell the rock-chippers when he
> > orders it that it is for a MSR-2000 second RX that is
> > using a 10.8 IF).
> >
> > Moving a Mitrek RX to 10.8MHz IF requires a little
> > soldering (you swap out the crystal filters and you
> > HAVE to use a clip-on heat sink on the leads of the
> > new ones) but also requires one-time-access to a
> > service monitor (or a scope and a sweep generator
> > that covers 10.8MHz).
> >
> > Mike WA6ILQ
> >
> > At 02:37 AM 11/30/04, you wrote:
> >
> > >I think he may mean operating on the same IF frequency,
> > >but I'm not sure.
> > >
> > >Joe M.
> > >
> > >Mike WA6ILQ wrote:
> > > >
> > > > At 02:52 PM 11/29/04, you wrote:
> > > >
> > > > >I have read a few comments in the past about the need for changing
> > > > >the crystal from one side of the operating frequency to the other in
> > > > >a Mitrek.
> > > > >I am not sure I will be wording this properly so please be patient.
> > > > >
> > > > >I will have two repeaters at the same site which are Mitrek
> > > > >conversions.
> > > > >One repeater is on 145.210 MHz (neg. offset) and the other repeater
> > > > >is on 147.240 (pos. offset).
> > > > >At present the 145.210 repeater is not a Mitrek but when I am
> > > > >finished the conversion it will be replaced by the second Mitrek.
> > > > >
> > > > >I would appreciate comments re experiences (ie problems) encountered
> > > > >if both receivers have the same frequency crystal.
> > > > >
> > > > >thanks
> > > > >
> > > > >Bruce, VE1II
> > > >
> > > > The standard 136-174Mhz Mitrek configuration uses high
> > > > side injection, with a 10.7 MHz IF.
> > > >
> > > > And remember, the 147.24 repeater will be listening
> > > > to 147.84, and the 145.21 repeater will be listening to
> > > > 144.61 - with over 3mhz of RX to RX separation I don't
> > > > see a problem at all.
> > > >
> > > > And if you are referring to the two repeaters being on
> > > > the same channel simultaneously, well, that's what
> > > > two different PL tones are for - set up repeater 1 on
> > > > tone A and repeater 2 on tone B.
> > > >
> > > > Or am I not understanding the question?
> > > >
> > > > Mike WA6ILQ
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
> Yahoo! Groups Links
>
>
>
>
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