You might want to get your info from the "real" source.
http://www.gigavac.com/products/relays/datasheets/gh1_3_5/index.htm
They are NOT even close to the same relays. You draw your own
conclusions but I am pretty sure the GH3s are SF6 gas filled and not
vacuum which is why they are NOT rated for RF service. Both have
tungsten contacts which is what allows them to be hot switched. Copper
contacts are much better for non-hot switched apps. because the copper
has lower resistance and heat is the enemy at high current. However a
couple of hot switches and the copper contacts are ruined. Relays that
are SF6 filled have actually better inrush capabilities than vacuum
relays but are not usable at RF.
See http://www.gigavac.com/apps/relays/physics/index.htm
Larry, W0QE
On 1/7/2011 6:31 AM, Paul Christensen wrote:
> Searching for the GigaVac GH1 relay, I found that Henry Radio has the 26VDC
> GH3 version of the GH1 for only USD $39.95.
>
> http://store03.prostores.com/servlet/henryradio/the-Henry-Amplifier-Repair-Parts/Categories
>
> Apparently the GH3 is load-switch rated, and supposedly able to withstand
> accidental hot-switching events better than the GH1, Jennings RJ1, and
> Kilovac counterparts. GH3 open& close switch times are comparable with the
> GH1.
>
> Anyone have experience wit the GH3? Do they switch as quietly as the GH1?
> At USD $40 ea. for the 26VDC version, that's quite a value.
>
> Paul, W9AC
>
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