[amsat-bb] QFH modification

["SV1BSX" <sv1bsx@xxxxxxxx>]

Hi Amsat s,

   I wondering if has significant difference in the behavior of QFH antenna,
if we replaced the UT-141 section on Domenico's design or the "hard line"
in the US-model, with a soft copper tube which has inside  a piece of
Coaxial cable
with smaller diameter of tube's diameter (RG-174?) till the N-type connector
(pre-amp input).

 Actually, for many of us is very difficult in some cases to find a piece of
"hard-line".
The QFH antenna is simple and effective, I know that because I've tested a
QFH, but
this piece of coaxial is a big trouble !

 On the other hand, I saw several models around Internet, without this
technique.
They have a simplest feeding method: the coaxial pass through the
plastic-tube (and QFH)
and is connected in the upper-point of QFH.

Question:  is it accurate this method? if not, the modification with
copper-tube including a smaller coaxial cable is it acceptable?

 Any comment is welcome.

73, Mak SV1BSX



sv1bsx@yahoo.gr
http://www.qsl.net/sv1bsx

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