Figuring that .045" is a standard 2000V air gap for variable caps in medium humidity it would be a good place to start. For 1500V set at .030".
Everybody should have a set of feeler gauges(-; A sacrificial size >100 uH choke should suffice as a static drain and be a visible indicator of whats happening. Carl KM1H ----- Original Message ----- From: <[email protected]> To: "160 reflector" <[email protected]> Sent: Sunday, July 29, 2012 4:18 PM Subject: Re: Topband: Spark Gaps.. > Trailer hitch balls should work fine as a lightning arrestor. Typically a > trailer hitch ball has spherical sides and a flat top. The two balls > should be oriented so they the spherical surfaces are side-by-side and so > that rain water and debris cannot bridge them. Ideally they should be > shielded from rain and insects. The gap should be adjustable, and it > should be set to about the thickness of a credit card (1 to 2 mm). > > 73 > Frank > W3LPL > > ---- Original message ---- >>Date: Sun, 29 Jul 2012 11:33:07 -0600 >>From: DAVID CUTHBERT <[email protected]> >>Subject: Re: Topband: Spark Gaps.. >>To: Robert Briggs <[email protected]> >>Cc: [email protected] >> >>Bob, that an excellent idea! >> >>Dave WX7G >>On Jul 28, 2012 6:06 PM, "Robert Briggs" <[email protected]> wrote: >> >>> >>> Has anyone thought about using two trailer towing balls set up for a >>> spark gap? I use this on a 90 foot insulated mast in a very lightning >>> prone environment....To date "(25)" years, with many direct hits, I have >>> sustained no damage...Mast is located 20 feet from my lounge room.. >>> >>> 73..Bob..VK3ZL.. >>> _______________________________________________ >>> UR RST IS ... ... ..9 QSB QSB - hw? BK >>> >>_______________________________________________ >>UR RST IS ... ... ..9 QSB QSB - hw? BK > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1424 / Virus Database: 2437/5162 - Release Date: 07/29/12 > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
