[TowerTalk] TA-33 feed

[w7ni@teleport.com (Stan Griffiths)]

>The advertisements indicting feedline radiation as the cause of
>TVI and BCI are a joke.  Does anyone really believe that feedline
>radiation will cause TVI but radiation from the antenna does not?
>
>de  Tom  N4KG

Hi Tom,

I always figured that the radiation coming from a feedline was physically
closer to the TV antenna than that coming from an antenna so it was much
stronger and more likely to cause overload in the TV set.  I never saw it
explained tht way, but it is the only explanation that makes any sense to me!

I have also heard that a high VSWR will render a low pass filter somewhat
less effective and this could be the actual cause of TVI coming from a
tranmitting system with a relatively high VSWR.  That makes some sense to me
as well.

So it seems to me there COULD be a relationship between TVI and VSWR but not
because feedline radiation is fundamentally any different than antenna
radiation.
It could be because with feedline radiation, you are simply stuffing more
power (and more harmonics and parasitics) into the TV or BC set than you
would if the feedline did not radiate.

What do you think?

Stan  w7ni@teleport.com


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