[Elecraft] Antenna static charge precautions - any tips?

zendoc at netspace.net.au zendoc at netspace.net.au
Sat Sep 8 20:25:38 EDT 2012


Hello Group,

I've just re-hung my 80m horizontal loop.  With so much wire in the
air, I'm reviewing my static charge risks and how to reduce them to
protect my K3.  I'm in the mountains - things get bumpy and charged
up here. I once lost the wattmeter diodes in my K2/100 to a static
event, so I'm looking for prevention.   Any advice will be gratefully
received.

Here's my new setup:

80m loop fed with open wire line to a DX Engineering 1:1 balun outside
the shack.  A 5 foot length of RG213 brings the signal from the
balun, through the shack wall  to an AlphaDelta antenna switch.  The
outer shield of the RG213 is connected to the station ground, at the
balun, outside the shack.  The AlphaDelta switch is connected also to
the same station ground.  It grounds the centre conductor of all
antenna lines when in the "common" position  - and I leave it this
way whenever I'm not operating. My understanding is that any antenna
lines are protected by a gas discharge capsule in this switch, which
acts as a "fuse" in the event of significant static discharge on an
ungrounded line?

"Station ground" here means 2 copper pipes buried in earth outside the
shack and connected by about 6 feet of cable.  One of the pipes is in
very damp earth most of the year, the other is sheltered and is in dry
soil.

Is this setup sufficient to manage static discharge risk from my
antenna, or are there other precautions I should be taking?   I've
read about ICE static discharge devices  and high value resistors
from both sides of the ladder line to ground.    Just looking to
minimise risk without going overboard.

Thanks and 73
John
VK7JB




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