Ahem ...
Mike Morris wrote:
>
> At 09:04 PM 3/21/04 +0000, you wrote:
>
> >I have a motorola Motrac Radio, can anyone tell me if this unit
> >can be converted to use as a repeater, and what is needed for the
> >crystals. Any help on this would be appreciated. What could be
> >used for a simple controller with little to no hangtime? Thanks.
> >
> >Mathew
>
> The mobile Motracs are all over 30 years old and the insulation
> on the internal wiring (at least on mine is starting) to flake
> off.
That's because you live in the Los Angeles area - ozone and all
that ...
> Given that situation I would not trust a Motrac in a
> mission-critical environment.
Especially used as a repeater.
> The early Motracs - the HHTs used crystals in ovens. I do not
> know of anybody that is still making oven crystals.
International Crystal ... for one.
> The LHT series and MHT series used channel elements - packaged
> transistorized crystal oscillators. The UHF LHTs and MHTs used a
> funny two-piece element that is hard to find,
Only if you live in the Los Angeles area ... ;)
> but a one-piece blue element can be made to work just fine by
> changing one resistor inside.
Depends on what radio vs the Channel Element.
Re the LHT and MHT UHF radios:
The LHT and MHT radios can use 1 piece Channel Elements in the
transmitter ... the LHT receiver also uses a one piece
Channel Element ...
The UHF MHT receiver takes either the TLN8967A or TLN8968A two
piece Channel Element (please excuse me if I missed some thing
here, it's 1 am+ here.)
> Also the heat sinks on the tubes are made for a 10%-30%
> duty cycle - and the heat transfer characteristics is such that
> they can't "suck" the heat off fast enough for repeat duty.
>
> Mitreks make better low power low-duty-cycle repeaters if
> a crystal based radio is OK.... You can get them for $20-50 each.
> If you need a high duty cycle repeater go with a GE master-II.
Correct ... well, mostly ... GE Mastr II ... (spelled correctly)
> And if you need synthesized, two Maxtracs can be cross-
> connected into a dandy little low duty cycle repeater...
>
> As to a controller, any of the current crop can be set for a low
> hang time. The cheapest is the NHRC kit.
>
> Mike
Neil - WA6KLA
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