Topband: T-loaded vertical

[donovanf at starpower.net]

Hi Pete, 


Symmetrical T-verticals offer a performance improvement over 
inverted-L verticals but with a major downside if you operate on the 
higher bands. If the flat top of the T-vertical is near resonance on any 
HF band is will significantly degrade the performance of any Yagi 
antenna within hundreds of feet of the flat top. 


My recommendation: if you're serious about the HF bands don't use 
a T-vertical unless you can locate it far from your Yagis. 


I learned this lesson the hard way years ago with a 70 foot flat top 
on my T-vertical I totally trashed my 3 element 40 meter Yagis 
hundreds of feet away. 


73 
Frank 
W3LPL 

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

From: "N4ZR" <n4zr at comcast.net> 
To: "topband reflector" <Topband at contesting.com> 
Sent: Tuesday, February 18, 2020 4:45:27 PM 
Subject: Topband: T-loaded vertical 

I keep seeing references to people using symmetrical wire top loading 
instead of the single wire of an inverted L. My question is how to 
calculate the appropriate length for the two top-loading wires. 

-- 
73, Pete N4ZR 
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