[TowerTalk] Coax

[Gene Fuller]

Remember, on the receive side the desired signal may go down 3db but the 
noise also goes down 3db. That's why you can get away with  inefficient Rx 
antennas like beverages, pennants, EWE's, K9AY's, etc. If you make an 
antenna with a good directive pattern, even though  it's inefficient and the 
desired signal goes down, the noise also goes down, but you can improve the 
S/N ratio and use a preamp to bring the levels back up and still wind up 
having improved the S/N ratio.
Gene / W2LU

----- Original Message ----- 
From: "Charlie Gallo" <Charlie at TheGallos.com>
To: "Jim Thomson" <jim.thom at telus.net>
Cc: <towertalk at contesting.com>
Sent: Monday, April 09, 2012 12:35 AM
Subject: Re: [TowerTalk] Coax


>
> On 4/9/2012 Jim Thomson wrote:
>
> ...snip...   You end  up with 3 x choices.  (a) increase the
>> power output,  and-or replace amp with a much bigger one,
>> like double the capacity.  (B)  obtain much bigger coax.    C   use a 
>> combo of A+B
>
> ...snip...
>
> Actually, that only makes up the transmit side - that S3 signal just above 
> the noise goes down 3 dB too.  I think fighting for the Rx signal is just, 
> if not more important
>
> -- 
> 73 de KG2V - Charles Gallo
> Quality Custom Machine-shop work for the radio amateur (sm)
>
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