Re: [Repeater-Builder] Repeater Assistance in Michigan.

Thu, 05 Jan 2006 21:08:57 -0800

For starters dump the RG 8 Feedline and invest in some 1/2" or 7/8"Hard
Line (depending on distance btwn Antenna & Repeater)
Also what brand type of repeater is this?

[EMAIL PROTECTED] wrote:
> I'll try what Eric mentioned when I get a chance to go out to the
> site... as for now, I'll try to answer Mathew's questions...
>  
> Antenna Height = 27.0m, rooftop tripod
> HAAT =  16.4, elevation gains going south but drops quite a bit going north.
> Gain = purchased an Antenex FG1523, 3dB Fiberglass Omni
> Feedline = RG8, mentioned 9913 when I went to the shop but the coax has
> no markings on it when I got it so I'm not quite sure if I got it or not :)
> Power of Transmitter = 50w, 35w after duplexer
> Duplexer = Sinclair MR256B*2 - Mobile Type, tuned by shop
> VHF-Hi, 152.8850 & 159.5400
>  
> Thanks!
>  
> -----Original Message-----
> From: Mathew Quaife <[EMAIL PROTECTED]>
> To: [email protected]
> Sent: Thu, 5 Jan 2006 18:47:36 -0800 (PST)
> Subject: RE: [Repeater-Builder] Repeater Assistance in Michigan.
>
> It would be helpful to know how high the antenna is, gain, feedline and
> power of the transmitter, and as Eric said, what type of duplexers,
> etc....Are we dealing with VHF or UHF?
>  
> Mathew
>
>
> */Eric Lemmon <[EMAIL PROTECTED]>/* wrote:
>
>     Since a repeater's range is limited *primarily* by its ability to
>     receive,
>     you should concentrate on those factors which directly affect receive
>     sensitivity. One of the most common problems is the use of a
>     duplexer that
>     has insufficient isolation for the combination of transmitter power and
>     receiver sensitivity. A transmitter PA that produces a "dirty"
>     signal (one
>     with spurs) coupled with a broadband receiver will require much more
>     isolation than a pure-carrier tube PA and a very narrow-band receiver.
>
>     Does the range improve if you reduce transmitter power to, say, 20
>     watts?
>     Does the range improve if you remove any preamplifier on the receive
>     side?
>     Does the range improve if you put a single bandpass cavity with 1.0
>     dB of
>     insertion loss between the duplexer and the receiver? Is the duplexer
>     *known* to be properly tuned?
>
>     73, Eric Lemmon WB6FLY
>
>
>     -----Original Message-----
>     From: [email protected]
>     [mailto:[email protected]] On Behalf Of kfd29
>     Sent: Thursday, January 05, 2006 3:29 PM
>     To: [email protected]
>     Subject: [Repeater-Builder] Repeater Assistance in Michigan.
>
>     Looking for assistance w/ a new repeater system in GR, Michigan...
>     Could use
>     a hand in finding out why we can not pick up 5 watt handhelds only 5
>     miles
>     out, maybe we missed something in setup? If anyone is knowledgable in
>     troubleshooting repeaters or in the GR area, please contact me! Small
>     business that can't quite afford the $70/hr charge for a tech right
>     now lol.
>     Thanks!
>








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