As I recall - every 3 db is a doubling of power - SO:
50 watts into 11 dbd antenna - 630 watts
100 watts into 8 dbd antenna - 631 watts...
OK - they are about equal...now what about maintenance, cost of antenna,
etc. The 11db antenna would probably have a sharper pattern, and require a
larger rotator. But then there is the cost of the amp, etc.
At this point - it is probably just an economic decision, as well as a
"hassle" question - which is the least hassle to set up and maintain.....
Scott, aka KB0FHP
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com]On Behalf Of Randy Molyneaux
(ve5 rjm)
Sent: Friday, January 05, 2007 8:12 PM
To: towertalk@contesting.com
Subject: [TowerTalk] High Power / Low Power ? / better antenna
I was curiously seeking info on a new repeater and came across many sites,
and formulas
and one in choosing the best overall system for the cost. What would it
be.....
Let's say in choosing equipment everything is fairly close in camparison.
50 Watts (100 % duty cycle)
Let's not disucss options...especially right now?
145 feet of 1/2" coax line...(Minimum loss)
the question is?
Would you consider an amplifier pushing out 100 Watts at 100 % duty cycle
over a 4 bay dipole antenna (8 dbd gain)
or
Would you consider 50 watts over a 8 bay dipole antenna (11 dbd gain)
overall the area within an 60 mile radius is faily flat.
All suggestions are welcome
73's
Randy Molyneaux(VE5RJM)
Michelle Molyneaux (VE5MDM)
EchoIRLP Node 1710 & 1858
EchoLink Node 48431
ve5rjm@hotmail.com
http://parc.sasktelwebsite.net
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