Thanks Steve...great info.73,Gary K9GS
-------- Original message --------From: VE6WZ Steve <ve6wz@shaw.ca> Date:
4/17/23 1:08 AM (GMT-05:00) To: Gary K9GS <k9gs@gjschwartz.com> Cc: RVZ
<rlvz@aol.com>, towertalk@contesting.com Subject: Re: [TowerTalk] Beverage
Resistor Source- Thank You! Hi Gary,The data sheets for these GDTs provide some
info about expected life.For example, the light duty GDTs that I gave the link
for says that they are designed for 300 impulse operations at 100A, but only
one operation at 10,000A. Data sheet
here:https://www.mouser.ca/datasheet/2/54/2057-66485.pdfThere are other, more
robust GDTs, some of which I have used that have even higher dissipation
values. It is worth reviewing the data sheets on various units to find one
best suited to your needs. Perhaps in lighting prone Florida, a more robust
device is called for.I have not had any failures here, and do see lightning
frequently during our summer months with convective thunderstorms from daytime
heating.Steve, Ve6wz. Sent from my iPadOn Apr 16, 2023, at 8:22 PM, Gary K9GS
<k9gs@gjschwartz.com> wrote:Hi Steve,Curious, how do you determine when the
GDT has been degraded, from repeated discharges, to require
replacement?73,Gary K9GS-------- Original message --------From: steve_VE6WZ
<ve6wz@shaw.ca> Date: 4/16/23 10:43 PM (GMT-05:00) To: RVZ <rlvz@aol.com>,
towertalk@contesting.com Subject: Re: [TowerTalk] Beverage Resistor Source-
Thank You! Hi Dick,As others have said, also add a GDT across the Beverage feed
box, between antenna and gnd.Adding another across the coax at the feed box is
good prevention too.This will prevent vaporizing the matching transformer.Buy a
lot of those GDTs. Anything that is exposed to a potential lightning surge can
use one.I buy 100 at a time.What some may not know, is that these Gas Discharge
Tubes (GDT) are exactly what you find inside of the coax lightning arrestors
like Alpha Delta and others.At my remote station, ANYTHING that is outside in
the field, and anything that enters the shack has a GDT on an exposed line.
This includes all coax feeds and DC control lines going to boxes in the
field.Add some at the shack entry too.A problem with using a fuse in series is
that they may not react fast enough to protect what is down stream. A GDT is
designed for this purpose. It is fast and designed to dissipate the energy to
ground to limit damage.73, de steve ve6wzSent from Mail for WindowsFrom: RVZ
via TowerTalkSent: April 16, 2023 8:00 PMTo: towertalk@contesting.comSubject:
[TowerTalk] Beverage Resistor Source- Thank You!A big Thank You to everyone who
replied about my Beverage Resistor question. Many great ideas. For starts I'm
going to add a gas discharge tube between the beverage resistor and ground.
And if that doesn't solve the problem I'll add a 1-Amp fuse in-line. Thanks
& 73, Dick- K9OM
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