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echo: ham_tech
to: JEFF EDMONSON
from: ROY WITT
date: 1997-04-07 07:30:00
subject: SWRs & more power DEBATE

Hello Jeff.
05 Apr 97 22:34, Jeff Edmonson wrote to Roy Witt:
 JE> SWR is actually supposed to be measured at the antenna.  A small
 JE> signal source incjected into the INPUT source of the meter, at the
 JE> desired frequency will allow instantaneous tuning.
 JE>
 JE> Placing the SWR bridge between the radio and say an amplifier will
 JE> allow you to adjust the input impedance of the amp (if homebrewing an
 JE> amp)
I know, but almost everybody places the swr meter between the tx and coax.  
How many are willing to climb a tower to do otherwise?
I build VHF/UHF yagi's for a commercial customer.  Fortunatly, I can tune 
them while on or 1/2 wave above the ground. If I tune an antenna with the swr 
bridge at the antenna and then place the swr bridge at the other end of the 
coax, there's a difference. 1.2:1 at the antenna, 1.9:1 at the tx. No 
amplifier, No antenna tuner, no etc.. Now what do I tune to get 1.5:1 or less 
at the tx?
 RW>> ... It's not bass unless you can feel it!
 JE>
 JE> Bass is meant to be felt, not heard!
If you can hear bass, it's too late to be felt.
... Keep your frequency up, that way you won't lose your load
---------------
* Origin: KB6PI's Antenna Farm * San Diego, CA (1:202/909.10)

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