Your fire station sites may be completely different from your 2m sites. The
antenna contribution itself is not likely to be the single issue, but height
above ground (AGL), ground elevation (MSL), output power, receiver
sensitivity, transmission and duplexer/filter losses all cumulatively
contribute to the propagation effect. The antenna is but one element. If
you were to compare apples to apples, you could change out the values for
the specific elements and do some comparisons. I have some prediction
software that takes all of that into account and even spits out a coverage
area contour prediction which can be overlayed on top of the station being
compared. But then again, we get paid megabucks to do this stuff
commercially! Hope this helps you some.
Todd Ellis, N2XL
Raleigh, NC
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-----Original Message-----
From: Kurt Bleich <kurt_bleich@...>
To: repeater-builder@... <repeater-builder@...>
Date: Friday, April 16, 1999 8:59 AM
Subject: [Repeater-builder] exposed dipole question
From: Kurt Bleich <kurt_bleich@...>
I have been watching some of the email in regards to these antennas, and
now I
have a question. We have a VHF repeater for our fire depts in our county.
Compared to using other ham repeaters on 2m, this repeater seems to very
deaf.
Would any characteristic of these exposed dipole antennas affect rx? This
repeater is all new and has been checked out several times, and I am making
the assumption that everything else is good.....I merely a 'user' on this
repeater.
RX is 156.165
TX is 150.995
I have not watched the emails too closely, so if this has been previously
discussed, please foward the info to me privatly.
Thanks
Kurt
KB0HNR
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