I've seen pictures of all sorts of gaps, two wires almost touching,
interlocking rings, adjacent spheres, Jacobs ladder like rods with
tapered spacing , etc. One amateur radio product uses automotive spark
plugs (non resistor) and is sold as a pair on a copper plate for open
wire feeders. However, a copper plumbing sweat fitting is soldered over
the gap so it is impossible to measure the gap. My question is, if I
use a non resistor spark plug as a arc gap, is there any experience that
can be shared about what the gap distance should be set to? I plan to
have a removable cover over the gap end for WX protection .
Are there better designs for a gap that are easy to fabricate and
weather/bug resistant?
And a second question: Gas discharge capsules are used in coax
lightning protection devices. A large variety of gas discharge
components are stocked at Mouse, Digikey, etc in various voltages and
Kamps. Is there any difference in the RF properties of the tube in the
in-line coax devices vs what I can buy a lot cheaper as a component? eg
Littlefuse and TDK 800v @ 10Ka around $3ea.
http://www.littelfuse.com/~/media/electronics/datasheets/gas_discharge_tubes/littelfuse_gdt_cg_cg2_datasheet.pdf.pdf
Grant KZ1W
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