If you look at the trip curves, a 600 volt @ 60 amp event takes about 5 ms.
to trip the device. I think that transient devices with a standard low
current fuse would work better.
See http://hr-micro.com/ for K5FD's SP12 surge protector as an example.
See http://hr-micro.com/images/SP12schematic.jpg for the circuit.
I use one and its well built. I couldn't build it much cheaper than he gets
for it.
73 de Perry - K4PWO
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Mickey Baker
Sent: Thursday, October 07, 2010 11:14 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Protecting Control Lines
Are the devices sold for "lightning protection" of rotator and control lines
all simply gap+MOV protectors? Perhaps GDT?
Is one better than another? I respect your opinion, but do you have a
technical, non-anecdotal reason to believe which is better?
They seem damn expensive for what they are, so I'm considering building one.
Has anyone built a protection block?
I found these resettable fuses/MOVs while shopping to build one:
http://www.circuitprotection.com/catalog/2ProDS.pdf
Anyone used these?
(I don't have any relationship with any component manufacturer - this isn't
a plug.)
73,
Mickey N4MB
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