Yes.  Open waveguides are also known as “10 dBi antennas”.  

From: Mathew Howard 
Sent: Friday, September 23, 2016 9:27 AM
To: af 
Subject: [AFMUG] Is it safe to turn on an 11ghz radio without an antenna?

Can I safely setup an 11ghz radio (Mimosa B11, in this case) on the bench 
without attaching it to the dish, or is there a risk it'll damage the radio?


I seem to remember being told it was fine to turn on our SAFs without dishes, 
and I'm assuming these would be the same, but that was a long time ago...

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