[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: Patch feed vs. Helix ???

Hello This is Yoshi.

At 2003/11/05 16:44:29 K7XQ wrote:
> Am I correct to say that a 5 turn helix has more gain than a patch feed
> for the AO-40 downlink ???

  The antenna gain of dish system is not based on how much gain
the feed has. You should choose your feed by beam width but not
with gain.
  Usually the patch feed has about 120 degree -10dB beam width and
good for center-feed dish, and 5-6 turn helix has much more narrow
and good for offset dish.

Yoshihiro Imaishi JF6BCC/KH2GR/T88IY
jf6bcc@jarl.com or yoshi@kh2gr.callsign.org

My Web Page <http://kh2gr.callsign.org>
UO-14.net <http://www.uo14.net/>
QRZ.com <http://www.qrz.com/detail/JF6BCC>
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org