[TowerTalk] MOVs in Stackmatch

[TexasRF at aol.com]

I was under the impression that MOV devices are "damaged" somewhat during  
each protection event and eventually enough "damage" accumulates and they 
have  to be replaced.
 
Maybe someone with more knowledge will comment on that.
 
If this is the case, it seems that a big hit might use up a lot of the  
reserve.
 
73,
Gerald K5GW
 
 
In a message dated 6/3/2009 7:50:34 P.M. Central Daylight Time,  
kkbroadcastengineering at gmail.com writes:

MOV's  should fail shorted or destroyed.  A visual or simple continuity
check  will locate those.  Occasionally they will fail open.  There is  a
HV tester for MOV's but if you have access to a megger or hipot  tester
that will work as well.

Otherwise just replace them  all.  They are cheap and very effective...

john at kk9a.com  wrote:
> WX0B relays are pretty tough, I have had many direct lightning  strikes 
and 
> no relay damage - even with no MOV protection near the  relay.
> 
> I have had MOV's short after a direct hit, so  sometimes they fail 
closed.  I 
> always replaced any that were  obviously burnt even if open.
> 
> John KK9A
> 
>  
-- 
Kevin C. Kidd,  CSRE/AMD
WD4RAT
mailto:kkidd at kkbc.com

KK BROADCAST  ENGINEERING
http://www.kkbc.com

AM GROUND SYSTEMS  CO.
http://www.amgroundsystems.com

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Lawrenceburg, TN  38464
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