[TowerTalk] DC grounding of parasitic elements with insulators ?

[Gene Smar]

Jim:

     I used an aluminum strap 3/4 inch X 5 inches, stainless self-tapping
screw and a hose clamp to ground the parasitic elements of my Bencher
Skyhawk:
https://photobucket.com/gallery/user/ersmar/media/bWVkaWFJZDoxMzI5NDU3Mg==/?
ref= .  I applied some NoAlOx to the boom where the aluminum strap, cut from
a piece of flashing material, contacts the boom.  The Scotch 88 tape is
applied over the hose clamp.  The #10 self-tapping screw went into the
parasitics right through the insulator (PVC tubing.)  This antenna and its
grounded parasitic elements have been up in the air since 2001.  I use the
Bencher as capacitive loading for my shunt feed on Topband on a Trylon
T500-64 tower.  I run only 100 Watts.


73 de
Gene Smar  AD3F


-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Jim
Thomson
Sent: Monday, October 28, 2019 12:52 PM
To: towertalk at contesting.com
Subject: [TowerTalk] DC grounding of parasitic eles with insulators ?

Ok,   the  ref  +  dir  on  my  modified F12 340N...3  el  40m  yagi  are
insulated  from  the  boom.
Whats  the  easisest way  to  dc  grnd the eles.....  and  also  leave  the
insulator between ele  halves intact??? 
Resistor,  choke,  strap  ?

I  also  have a nema  box,  with  2 x vac relays  +  strap  coil... to
allow  for  4 x segments  of  REF.....and  also  DIR  tuning.


DE  is  not an  issue,  hairpin across  the  feedpoint.    CM  choke
1st....  then  Braid /  shield  is  bonded  to  top and  bottom  of  tower.
Another  nema box  at  DE....  but  with  2  strap  coils,  and  each  coil
tapped  with 2 x vac relays.   4  relays  in  total  for  DE.  That
provides  for   7 x DE  tuning  segments. 

I  want the  ref +  dir  dc  grounded  at  all  times. 

Jim  VE7RF   
_______________________________________________



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