[TowerTalk] Grounding mast?

N2TK tony.kaz at verizon.net
Wed Jul 30 11:12:04 EDT 2008

I found I had some intermittent changes in SWR on 160M (shunt feeding the
tower). I put a grounding strap from the mast to the top of the tower
(across the TB-3).  SWR has been stable since. Have not bothered to put a
ground strap across the Prosistel.

Have a MonstIR. Was going to short out the passive elements to the boom. But
I am getting the 60/80M add-on kit so won't be able to do that except for
the 1st Director. Will ground that and see what it does for top loading on
160M. Even without grounding the elements I can move the SWR on 160 all over
the place with running the elements in and out on the MonstIR. There seems
to be no arcing or sputtering so far on topband.

N2TK, Tony

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of jim Jarvis
Sent: Wednesday, July 30, 2008 4:06 AM
To: towertalk at contesting.com
Subject: [TowerTalk] Grounding mast?

Been following the SteppIR v. Stepper.IT thread while travelling.
Had a few minutes to browse both websites, this morning,
and came across a short commentary about lightning and ESD protection  
for the steppIR.

It raises the question of static charge buildup due to wind motion,  
in (one assumes)
drier climates.   Points out lack of conductivity across rotors,  and  
asserts 300-500V per meter
above ground as the possible potential buildup.    Routed into the  
shack, if the charge isn't
bled off.

The discussion recommends a positive ground between the mast, and the  
tower, as well
as a good dissipative ground for the tower itself, as lightning  
protection would dictate.

The physics of this are real.   What amazes me is that this is the  
first time I'm seeing the
discussion, in these terms.   Does anyone actively ground their mast,  
across the rotor?

Firsthand experience?



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