Re: [TowerTalk] Topband: RX 4 square

["Jim Brown" <jim@audiosystemsgroup.com>]

On Wed, 22 Aug 2007 14:09:43 -0400, Tom Rauch wrote:

>The other thing the amplifiers do is have a source impedance 
>of about 60 ohms or so to drive the 75 ohm cable. A 
>reasonable and stable (over frequency) output impedance is 
>necessary to maintain phase in the elements. 

YES! And this is NOT trivial!  Phase shift in the resulting network 
(antenna through transformer to transmission line) will add to the 
delay of the transmission line. The resulting pattern will not be 
as expected. 

Jim Brown K9YC




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