[R-390] Filters

[KA9EGW]

I suppose the question of what alloys are involved and whether some sort 
of inert-gas shielding is desirable...

When I serviced drive rod welders at Knowles Electronics I don't recall 
there being any inert-gas shielding.
KA9EGW


On 2/17/2013 10:23 AM, quartz55 wrote:
> Well, this may be the time of year to do filters.  Humidity is around 35% inside right now.  I'm not even going to try to evacuate it.  It's going to be used inside and if anyone wants to use it in the frigid weather, they will have to deal with it.  I suppose getting it warmed up before sealing it would drive out most of the moisture, but not like evacuating and sealing it.  All I have anyhow is one of those wine bottle pumps.  I can see why these things are expensive, there's a lot more to it than putting a bunch of wires together.
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