--- On Thu, 10/15/09, Randy Ross <rr...@librtynet.com> wrote:
From: Randy Ross <rr...@librtynet.com>
Subject: [Repeater-Builder] Maybe a strange question...
To: "Repeater-Builder@yahoogroups.com" <Repeater-Builder@yahoogroups.com>
Date: Thursday, October 15, 2009, 9:04 PM
Our repeater is coordinated on a given two meter frequency. Due to terrain and
other factors, we were forced to agree to some interference from a neighboring
repeater, on the same frequency. The neighboring repeater is located on a peak
roughly 100 miles away from us, and roughly 1800 feet higher in elevation. The
repeater owner claims an ERP of 55 watts from an omni, however, I can
consistently hear that repeater on my base at my QTH with an s-1 to s-3.
I am transmitting 50w, 2dB loss in connectors, about 1.25 dB loss in feedline
and about +6.5 dBi in antenna gain. So, I figure my ERP should be about 100
watts (+3dB = double in power, right). My antenna height is about 35 feet.
So, as a newbie, I am assuming that if I can hear him at s-3, and he is
transmitting 55w ERP, where my ERP is >100w, I should be able to program the
radio with the proper offset and PL tone and get into the repeater. Is this a
correct assumption? After all, if I can consistently hear him, the path is line
of sight, right? Due to the difference in altitude, this would make sense. If
all else is the same, I should be able to bring the repeater up. Or, is this
repeater putting out much more than 55w ERP?
Unless you have a very good receiver and the repeater does not, if you can
hear a repeater and your transmitter is running the same or more power, you
should be able to bring it up.
You normally assume that the repeater is using the same antenna for receiving
and transmitting and the loss in the feedline and duplexer is the same for both.
