[NLRS] Trough reflector dimensions
Mark Brown
[email protected]
Sat, 31 May 2003 21:03:29 -0500
10' dish on 1296 is vwey useable, I can hear my own echos with 200 watts.
Mark
-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Dr. Gerald N. Johnson, electrical engineer
Sent: Saturday, May 31, 2003 11:34 AM
To: Brent Casavant
Cc: Northern Lights Radio Society
Subject: Re: [NLRS] Trough reflector dimensions
Reflector (focusing) antennas work poorly or not at all unless the
reflector is at least several wavelengths and work better the larger the
reflector. A 10' parabolic dish hasn't enough gain at 432 to account for
the wind catching ability, and isn't as good as a halfway decent yagi
design for gain. Takes 20 or 30' diameter of parabolic at 432 to work
EME, its marginal at 1296 with 12'
The dimensions seem right, to be inches.
73, Jerry, K0CQ
--
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.
_______________________________________________
NLRS mailing list
[email protected]
http://mailman.qth.net/mailman/listinfo/nlrs