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
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