Afternoon Tim,
What you are describing is a Fire dispatch setup where one geographic area is
not getting the tones to set off pagers, poor reception, and the like, while
another area is doing fine. What you are inquiring is a black and white area
with Public Safety.
Placing another transmitter on the air is not an easy task, it can be done if a
frequency can be allocated, you may be able to reuse the one in operation if
the coordination agency allows the increased ERP for the current and
neighboring area.
Next, the simulcasting setup for the system to work with the APCO and FCC
blessing can come from 3 sources all of which make solid products that include
the ability to phase your carrier and match your audio. 1 source requires you
have their brand of equipment matching their model requirements since their
respectably high standars say so. No lie, and they are right to demand it their
way. It works every time.
Just so its clear, this is not going to be a $1000.00 add on and no one person
can complete this project by themself.
If you were going to try this without any transmitter conditioning, you will
have the hetrodyne, the tones will not be decoded properly throughout most of
the area of coverage old and new, and you will not be happy with the results.
Let's not even mention this if you are on Low Band.
With most of the Public Safety equipment I have had my hands on all can stand
some tweaking without much money or effort. The antenna systems on most leave
alot to be desired, a preamp properly placed or more isolation in a duplex
system can make a night and day difference.
The same transmit theory from dispatch is a disaster in waiting. This will not
work properly. PL only seperates audio it does nothing for RF. BAD idea.
Jason
--- In [email protected], "tahrens301" <tahr...@...> wrote:
>
> Hi Folks,
>
> I know it's been done a lot, but I have no experience in
> having two repeaters simulcasting.
>
> Here's the info:
>
> There is an existing repeater that has some coverage issues
> in a neighboring area. The folks in that area, while still
> wanting to be on the same output frequency, will put a 2nd
> repeater (with a different rx PL tone) up on a hill.
>
> What kinds of issues will we see (from a user's perspective)?
>
> The dispatcher will probably key up both repeaters at the same
> time for tone-out purposes.
>
> What kind of frequency tolerance is acceptable to make sure
> there isn't any hetrodyning? (especially with PL tones &
> tone-out tones).
>
> thanks,
>
> Tim
>
