[AMPS] Vacuum relays

[Rich Measures]

>
>Gerard & Rich...
>
>I'm of the understanding that tungsten contacts are pretty dicey for 
>switching "dry circuits" like the T/R receive path. My understanding is 
>that what makes them durable for heavy hot switching (i.e., big high power 
>contactors) tends to make trouble on dry circuits. Would be interested in 
>any solid info to the contrary.
>
I have heard of no such problems with Vacuum-relays that use tungsten 
contacts.  Perhaps absence of oxygen is a factor?.  .  The rated max. 
contact R is 0.03 ohms for Jennings'  RJ-1H (tungsten contacts)  relay.  
The trade-off is that the continuous RF currect handling ability of 
tungsten contacts is roughly half that of same-dia. copper contacts.  
-  later


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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