At 04:07 PM 2/9/04 -0500, you wrote:
>Mike Morris WA6ILQ wrote:
>
> > At 07:22 PM 2/8/04 -0800, you wrote:
> >
> >> Mike Morris WA6ILQ <[EMAIL PROTECTED]> wrote:
> >>
> >> At 02:51 PM 2/8/04 +0000, you wrote:
> >>
> >> >hi
> >> >I dont know if some one can tell me how i setup Motorola Pac/Rt
> >> >mobile repeater, VHF, Model H13TTY3110ASP29 to stand alone repeater
> >>
> >> The short answer is you can't.
> >>
> >> It's a unit deigned to connect to the audio lines and PTT of an existing
> >> mobile radio and allow use of that radio via a hand-held radio.
> >>
> >> Picture a state police officer making a traffic stop on a highway.
> >> Before he gets out of his patrol car he flips on the PAC/RT and
> >> walks back to have a chat with the motorist.
> >>
> >> His mobile radio hears a signal and that audio is transmitted by the
> >> 1/4 watt transmitter in the PAC-RT to the officer. He answers by
> >> pressing the PTT button on the handheld, and the PAC-RT receives
> >> the signal and keys the mobile TX.
> >>
> >> If a second patrol car arrives on the scene and enables his PAC-RT
> >> the first one is shut off.
> >>
> >> All of this is done on a simplex channel.
> >>
> >> A similar product can be found at
> >>
> >> Read that web page for the theory of how it works.
> >>
> >> I've had a high band PAC-RT on the shelf for 10 years. I haven't
> >> found a use for it yet.
> >>
> >> It's based on a low-end walkie talkie, with the transmitter castrated
> >> back to one-quarter of a watt, with a very poor front end, and to change
> >> the frequency you need to order a new crystal and install it into a
> >> channel element.
> >> High band PAC-RTs were used on low band and UHF mobiles. UHF
> >> ones were used on high band and low band mobiles.
> >> A few ham radio operators here in the Los Angeles area played with
> >> them over a dozen years ago and while they did work, they were not
> >> practical in an area with a lot of repeaters... you might as well have
> >> the handheld talk to the repeater rather then talk to your car which
> >> talks to the repeater.
> >>
> >> Mike WA6ILQ
> >>
> >>
> >> motorola originally called the pac/rt a mobile repeater in actuallity
> >> its really a portable extender [ ie.> if your down in a gully with a
> >> portable checking out a car crash -your car is way above you on the
> >> highway ...instead of running up the embankment to talk to your base
> >> ..you call on your portable which forces the mobile in the car to
> >> transmit with its full { lets say 100 watt mitrek} the base hears your
> >> message and responds ..your mobile in turn causes your pac/rt to
> >> transmit back to your portable } biggest draw back was its only 1/4
> >> watt output on the portable channel...its amazing what motorola did
> >> with all those handie-com portables left over before they made the
> >> ht90/440 series radio's huh ?
> >
> >
> > And it wasn't that hard to bump the handi-coms to amateur channels - 2m
> > or 440 - or to put the missing final transistor back in. And I saw more
> > than one that had a different radio patched in place of the handi-com -
> even
> > a Midland 13-509 220mhz mobile (modified for solid-state-switching).
> >
> > Mike WA6ILQ
>
>That's another strange comment-I haven't fired up the ones I have, but I
>remember that a local (very small) PD near where I used to live had a
>VHF one in the chief's car tied to the 39Mhz mobile. I was working for a
>'basement MSS' at the time, and was told that that unit put out about
>1-2 W. The chief would park the car at the station, turn on the PAC-RT,
>and use his portable all over town! He said there wasn't much of
>anywhere in town he couldn't go...heh
>(It WAS one of the very first ones out there, back around 1979-80 I think.)
>--
>Jim Barbour
>WD8CHL
The PAC-RT manual I have says that it's a 250mw output transmitter. It
shows a Handi Com MH10 or MH70 (I forget the model number) handheld
board in it with the final transistor and it's collector resistor removed and
a capacitor bridging the base and collector pads.
Either someone put a regular handicom board in it, or it must have been
a real small town with the police station on a slight hill.
Moto did some strange stuff to try and make sales... I can imagine the
Chief's PAC-RT appearing with the undocumented "high power option".
Mike
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