Topband: Beverage Antenna Tuning

[donovanf at starpower.net]

Hello Ash, 


Your results are normal for a typical Beverage. Receiving performance 
is not significantly degraded by imperfect matching of the coaxial feedline 
to the Beverage feed point or by non-optimum termination resistance. 

You could optimize your matching transformer and termination resistor 
but the improvement in receiving performance will be very minor. 


On the other hand, Beverage antenna r eceiving performance can be 
significantly degraded by: 
- nearby antennas, power lines and other long conductors, and 
- common mode signals coupled into the feedline 


You could optimize your matching transformer to reduce the VSWR to 
closer to 1:1 on the frequencies you care about most, but you won't 
notice any improvement in receiving performance. 



You could optimize your Beverage termination by: 
- adding extra ground rods and/or short radials to improve ground resistance 
stability at the connection to termination resistor. 
- adjusting the termination resistance to minimize the VSWR excursion 
as you sweep from 1.5 to about 10 MHz 


73 
Frank 
W3LPL 

----- Original Message -----

From: "Ashraf Chaabane" <ash.kf5eyy at gmail.com> 
To: topband at contesting.com 
Sent: Wednesday, July 4, 2018 2:13:27 PM 
Subject: Topband: Beverage Antenna Tuning 

Hi All 

I measured the SWR in my beverage antenna; the SWR fluctuates between 1.5 
and 3 in a range of 1.8 to 7 MHz. (See: 
https://drive.google.com/drive/folders/0B9AtNpPfAOUMRDNsaXROMG1VUTg?usp=sharing 
) 
I know SWR should not vary too much. However, some people are suggesting 
adjusting the termination resistor. Others suggest checking the transformer 
number of windings for a good match. What shall I do? 

73 Ash 3V8SS/KF5EYY 
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