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11.1m Vertex antenna pattern cuts - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


Koos
 Post subject: 11.1m Vertex antenna pattern cuts
Posted: Thu Feb 25, 2010 9:35 am 
 
Captain

Joined: Wed Sep 30, 2009 2:26 am
Posts: 6
How do I determine if the pattern cuts that I did are withinn specs for this antenna. How do I calculate the sidelobe gain, and is there any mask that I can use.

Thanks


 
   
 
Paul Chriss
 Post subject: Re: 11.1m Vertex antenna pattern cuts
Posted: Fri Feb 26, 2010 12:41 pm 
 
Captain

Joined: Sat Mar 04, 2006 10:12 am
Posts: 11
Are you talking about simulation or actual field measurements? My suggestion would be to contact the antenna manufacturer (or one that makes similar antennas) and ask them for a recommended procedure. They had to make the measurements in an OATS for something that size so you should be able to duplicate their setup without a lot of sophisticated equipment. A calibrate measurement antenna and a spectrum analyzer should let you do reasonable relative power measurements around the antenna field.

Here is a nice collection of satellite system calculators for you. They happened to be posted here on RF Cafe this morning (not by RF Cafe but a link to somebody's website). There's lots of great stuff there.

http://www.satellite-calculations.com/




Posted  11/12/2012

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