my advice for what its worth is to use commerical grade antennas such as DB224
(VHF) AND DB 420 (UHF) or the Sinclair equalent. No other part of a repeater
system can affect both the rx and tx as much as a GOOD/BAD antenna. As to the
power levels, remember that the mobiles must be heard by the repeater as well
as hearing the repeater for it all to work. So the mobiles are also going to
have to run simular power level to the repeaters. I suggest turning the amps
down to 50 - 75 watts out of the filters and see if that doesn't come close to
matching the ranges.
73's and good luck
Jeff N5sxq
---- w6ghz <[email protected]> wrote:
> Hello Group,
>
> Thank you for being here and reading this.
>
> I am new to this group and need antenna advise for a repeater system I am
> attempting to build. My electronics skills are very limited, but I know
> enough to assemble a system and get it on the air.
>
> This system consists of two repeaters linked by one controller in the same
> enclosure:
>
> 1) Motorola Micor vhf w/140W amp
> 2) GE Master Exec II uhf w/250W amp
>
> If one asks why I'm considering this much power, the reasons are:
>
> 1) The amps are available.
> 2) The terrain this system will be operating in is hilly with a
> lot of trees and vegetation.
> 3) The system is not on a hill top.
> 4) The antenna(s)for this system will only be on a 100' alum tower.
> 5) Several users are out in a fringe area.
>
> I am aware a good antenna can trump an amp and I'm open to alternate
> solutions. I have enough hardline and connectors to make a few runs up the
> tower if needed.
>
> Is there a practical, cost effective solution to antenna both of these
> repeaters? How do I go about acquiring the solution? Money is an object and
> one that is becoming less available as this project moves forward.
>
> Any thoughts are much appreciated.
>
> Thank you,
> Richard Young W6GHZ
> Shelby, NC.
>
>
