Thank you Bob,
 I have tried to tell the guys to make interfaces better so we can get rid of gaskets, but at Ku extremly small burrs and voids will cause uwave leakage and reflections, and make some fraction of a dB in reading. So, we use Si'rings also, but the gasket I talk about is for making the MECHANICAL interface better, i.e. a perfect ID-to-ID, resulting in less reflections. An ordinary surveillance radar with lots of power is of course not that critical. You can afford loosing one or two Watts here and there.
 Again, thanks for advice.
Ingemar Hernefjord
Ericsson Microwave Systems



     It is not too unusual of a question.

     We use a lot of C and Ku band waveguide.  Most of our assemblies fit
     nice and tight and we have been able to eliminate conductive gaskets
     and use cheap silicone rings to keep out the moisture.  The one
     situation I know we have to use conductive gaskets is for a WRD580
     flange.  We buy the gasket from a company called Microwave Resources,
     our cost is under $10.  Another is SAS Industries.

     Microwave Resources
     Bob Garvey
     770-441-9193

     SAS Industries
     Steve Steckis
     516-727-1441

     Good luck.

     Jay Bosserman
     MCL Inc.





Hi, an unusual question, but I see many radar guys are reading also in TechNet.
So, what sealing gaskets do you use for flange-to-flange sealing, electrically
as well as gas tightening? We tried Indium, works well, but the price is
immense. If the waveguide is ordinary Al with Nickel+Chromate, then what about
Tin gaskets? Atmosphere around is dry and you have that Nickel barrier. Copper
seems to be too hard. Any good idea?
Ingemar Hernefjord
Ericsson Microwave Systems

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