If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
International Buyers: Please note that export of this item is controlled for anti-terrorism reasons. Export is possible, but requires a license. It is not guaranteed that a license will be granted by the BIS, in which case the sale will be canceled. A nonrefundable export license fee of 100.00 USD is included in the cost of international shipping.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I think triggered spark gaps have been "munitions" under US law, ever since the fiasco with krytrons being sold to Iraq.
The US export laws are a pain. The company I work for got into trouble trying to buy Li-Ion battery packs from Ultralife. They wouldn't sell to us without an export license, and we were denied one the first time round because of some screw-up.
We ended up changing to a Chinese battery supplier.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
rp181 wrote ...
man, thats perfect for my capacitor bank. Too bad it costs so much, and Im almost done with mine :)
What kind of advantage do you get by purging the gap with co2?
The idea is to flush out ions left by the last discharge before the next one begins, to reduce pre-firing, remove discharge residues, and cool the electrodes, with a view to reducing jitter, and increasing workable PRF.
As for the 'dual use' of triggered gaps, the US Government Accountability Office refers to them in its report to the House of Representatives as "dual use" controlled technology together with.... oscilloscopes(sic)
see:
It has often been remarked that this "dual use" catch-all has more to do with limiting the industrial-commercial development of potential third-world trade competitors than anything to do with national security.
Vigilatny Registered Member #17
Joined: Thu Feb 02 2006, 02:47PM
Location: NL
Posts: 158
Proud Mary wrote ...
It has often been remarked that this "dual use" catch-all has more to do with limiting the industrial-commercial development of potential third-world trade competitors than anything to do with national security.
You underestimate paranoia. Anyhow the goal is the same regardless of the motivation.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Steve McConner wrote ...
I think triggered spark gaps have been "munitions" under US law, ever since the fiasco with krytrons being sold to Iraq.
The US export laws are a pain. The company I work for got into trouble trying to buy Li-Ion battery packs from Ultralife. They wouldn't sell to us without an export license, and we were denied one the first time round because of some screw-up.
We ended up changing to a Chinese battery supplier.
Triggered spark gaps have always been under ITAR regulation. They are most commonly used in high power pulsed systems including radar, etc...
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Some Triggered Spark Gaps For Sale On Ebay
