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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