Greetings all
Here's the situation. Our repeater is at 146.775-. Currently, we
have a real cheapie antenna and we want to replace it. We have
somewhat of a stealth situation in that our location is within a
histerical (historical) district and our "hosts" don't want the
height of the antenna to get raised much if any at all. Total
height from ground level to antenna tip as it is now is about 100'
or so. Our hosts don't mind us increasing the girth of the antenna
or mounting system (currently we use 15' of regular television type
mast). We only have to run about 40' of 1/2 hardline from the
repeater to the antenna (we're on a rooftop). The repeater is a
MSR2000 and has a factory preamp and Sinclair Q-202G cans. As of
this last Saturday when we were up there, the receiver had about .20
micV of sensitivity. Don't really know the loss and/or the
isolation of the duplexer...I'm sure it can be tuned better.
We're debating between 4 different antennas to replace the junk we
have now....
1. PD1167 3Dbd, 11.8' tall, fiberglass, 36deg vertical, 8 lbs
weight, having trouble finding a vendor that isn't export only,
prolly could use the existing mast, ain't sure of cost
2. PD440-3, 11.5' tall, dipole, 3 Dbd, 33deg vertical, 19 lbs,
(would have to use a larger mast), $365.00
3. DB222-E, 10.5' tall, dipole, d Dbd, 36 deg vertical, 16 lbs,
(prolly have to use larger mast), $250, not exactly tuned for
146.775, it's rated from 150-158 Mhz....courious as to the SWR and
if it would work
4. Comtelco BS150XL3-A, 8' tall, 3Dbd, 40 deg vertical, 6 lbs, can
use the existing mast, not sure how it would work on a repeater,
$150 plus mounts
Bear in mind, stealth is a major issue, that's why we are having to
choose from these models if we are to keep the mast height we
currently have. The existing mast is mounted against the handrail
for the walking platform of an elevator house. From the bottom of
the platform to the top of the elevator house is a bit under 10' so
the tip of the existing antenna is about 15' or so above the roof of
the elevator house. Also should mention that this area is the
piedmont area and that the repeater site (antenna tip) is prolly
150' or so HAAT.
Do you folks think we would be better off by:
1. getting some other antenna with a higher gain figure than
mentioned above (20' long or so) and reduce the mast height by about
5 feet, and if so, what would you recommend
2. select one of the above mentioned antennas and if so, which would
you select
3. contract with Nextel to provide our emergency communications
4. start collecting stamps instead of spending tons of time and $$$
simply to help our community in times of crisis (God forbid that
happens)
Bob, Amateur KG4WAD, GMRS WPVV845, LMRS WPXC892
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