[TowerTalk] MOVs in Stackmatch
Jeff Carter
towertalk at hidden-valley.com
Wed Jun 3 18:18:11 PDT 2009
That's exactly right. They're essentially semiconductors, and their
use as snubbers or clamps bear that out.
Like all semiconductors, they're affected by heat. Since they work by
converting the over-power situation to heat, in effect they kill
themselves slowly with every event.
Citations for this data appear below, in case anybody cares to look at
the original data.
Jeff/KD4RBG
Source: Simple Model of Metal Oxide Varistor for Pspice Simulation,
IEEE Official Publication
URL : http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1336959
---- Original message ----
>Date: Wed, 3 Jun 2009 21:05:16 EDT
>From: TexasRF at aol.com
>Subject: Re: [TowerTalk] MOVs in Stackmatch
>To: kkidd at kkbc.com,TOWERTALK at contesting.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
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