[Moon] W2IMU feedhorn

[Peter Sundberg]

Today I've been doing some maintenance on my 23cm W2IMU feedhorn. 

When adjusting the nulling screw on the back plate I see very little
difference in attenuation between the TX and RX port. Actually, it looks
like the attenutation is best without the nulling screw.

My question to you experts on this reflector, what difference/improvement
in port attenuation do you see when adjusting this nulling screw?

And what is the real world attentuation between the two ports?

>From what I can measure, attenuation between the ports on my feedhorn is
around 20 db.

73 de Peter SM2CEW
www.sm2cew.com
http://blog.sm2cew.com