[TowerTalk] Stub Filters

Robert Pack, NX5M nx5m at txcyber.com
Wed Mar 22 14:32:36 EST 2006

If I were to put stubs on my 80 and 160 beverage jumpers (between the 
switch in the shack and the radio), would this create nulls for the 
My scenario....I have different sets of beverages for both bands.  But qrm 
between the 80 and 160 stations, when on at the same time, is bad enough 
that weak signals can be covered up.  I have bandpass filters in line with 
all stations as well as bandpass filters on each beverage jumper but there 
is still a bit of a problem.
With that said, I know that a 92 foot shorted stub will null 80m and all 
bands above and a 46 foot shorted stub nulls 40m and up.  So what is best 
for nulling 80m signals from the 160m station?  46 foot open, 92 foot open 
or what?
Like to hear from some experts on this subject.

Bob NX5M

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