[Antennas] To anyoine made T2FD antennas

[Zacharias Liangas]

Dear  frinds of the list 


Please reply directly to me!!

I tried the previous week to make one T2FD  of 20m + 60 cm  sizes using 5 
mm thick PVC    as main spreader for  the terminator resistor ( 3 x 330 Ohms 
in parallel) and collector (a TV  air-core balun   for the moment ) but with 
expanded PVC  for  all other spreaders. The result  was that  these expanded 
PVD spreaders  were very easily broken on handicraft so that I will  delay a bit 
the installation of the T2FD  , in order  to find first some batter materials  for 
this  work. Possibly  plastic tubing used for sub-floor heating which I know is 
very strong, as well as  strng PVC sheet for the main spreader. 
Just a little  about the current situation: 
 
My RX point is on the top of a mountain ,  with very strong winds up to 10 B . It 
is a two   store house and the maximum  length I can install a T2FD antenna is 
about 25m . ( by calculation)  
For the moment I use one 16m simple wire on 4 m height and one  2 m 
height , 2 x 14 m  dipole. 
  
I try now to install  two new antennas , the above mentioned T2FD , as 
well  as a new  inverted dipole of ca 2 x 17+6  m (dual band) . Both will be 
supported on the  highest point of the house  whre a  previous TV antenna  
installation occurred. 
 
Here I  give you  some  questions about the making of the antenna and 
something more  general . Please reply to each question separately.
 

1. Do you think  that using SWG#12 will have any better gain over #14 ? 
Using #12 however  was relatively difficult to handle but I think that #14 
could be much easier. But still I think  since the wires are already cut to 
length, minus a few cm  , it is better to be reused .  THe one pole is about 
3-4 cm shorter than the other pole 
 
2. About nylon cord. Do you think that if I replace nylon with normal wire  
can affect the  reception ( negatively or positively) ?Do you know if grass 
cutting nylon cords are OK  for this?
 
 3. Do you think that aircore balun for VHF can be used OK?  I have some 
printed circuit baloons available 

4. Will there be any problems using a 75 Ohm TV cable instead of 50 , 
with the use of the  VHF balun? I have too many spare cables, suitable 
also for satellite  TV ) 
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