[TowerTalk] High Power / Low Power ? / better antenna

[N7KA at comcast.net]

One consideration often forgotten in the dB arguement is the benefit on the RECEIVE side as well.  I would rather have 100W into a 3el yagi than 1000W into a dipole in most cases.  Then there is the antenna pattern noise/QRM rejection as another plus.

Arne N7KA

-------------- Original message -------------- 
From: "D. Scott MacKenzie" <kb0fhp at comcast.net> 

> 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 at contesting.com 
> [mailto:towertalk-bounces at contesting.com]On Behalf Of Randy Molyneaux 
> (ve5 rjm) 
> Sent: Friday, January 05, 2007 8:12 PM 
> To: towertalk at 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 at hotmail.com 
> http://parc.sasktelwebsite.net 
> _______________________________________________ 
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