How can I continuously discharge static from my end-fed antenna?
My Electraft K2/100's autotuner (schematics) has an SWR bridge using two 1N5711 pin diodes. These diodes get blown if any static builds up on the antenna. I've replaced them four times now. It's nice that I can replace them, but I'd rather not buy diodes in bulk.
I keep the antenna disconnected when I'm not using it, but sometimes forget to disconnect it when I'm done. Plus, static can build up when operating--rain puts a terrific static charge on the antenna. So I need some kind of protection from static.
I've read that I can use a resistor or coil between the antenna and ground to bleed off static, but I don't know what to build or buy.
My antenna is end-fed wire slung out of a tree and run through a small hole in the wall. There's just a few feet of feed line between the rig and the antenna.
The RF ground is a ground rod just on the other side of the wall and connected to a jumper cable wire also poked through the wall. The jumper cable connects to a copper pipe mounted to the bench. Connected to the ground pipe are:
- The rig's ground lug
- The tuner's ground lug
- One side of the balun
The ground rod is not connected to the house's electrical ground.
The AC ground is connected only to the station's linear power supply.
The antenna, RF ground, and feedline all meet at a 1:1/4:1 switchable balun.
The rig outputs 100W on 80M-10M, but I operate mostly on 40M and 30M.