[amsat-bb] If you have just one choice, what is the best polarization to receive LEO Birds?

Stephen E. Belter seb at wintek.com
Wed Nov 18 19:30:29 UTC 2015


The worst orientation is to have the elements of your Yagi parallel to a
metal mast.  So unless you¹re using a fiberglass mast or cross-boom, mount
the antenna so that the elements are perpendicular to the mast.

If you¹re mounting the antenna on top of a vertical mast, orient the
antenna so the elements are horizontal.  If you aren¹t using an elevation
rotor, you may want to slope the boom of the antenna so that it points up
from the horizon by about 15 degrees.

If you¹re mounting the antenna on a horizontal cross-boom, so that you can
use an elevation rotor, orient the antenna so the elements are vertical.

Many of the satellites have a monopole or dipole antenna and are spinning
or tumbling, so you¹ll have fading regardless of whether you use
horizontal or vertical position/polarization.

Hope this helps.

73, Steve N9IP
Steve Belter, seb at wintek.com

On 11/18/15, 2:08 PM, "AMSAT-BB on behalf of B J"
<amsat-bb-bounces at amsat.org on behalf of va6bmj at gmail.com> wrote:

>On 11/18/15, Vinicius Leite <pu4vlt at gmail.com> wrote:
>> Hi Folks!
>> I'm novice and sorry if this is a dumb question.
>> I have a regular 7 Element Yagi UHF antenna, and i would like to know
>> is the best position to receive LEO birds: horizontal, vertical or 45
>> degrees to the right?
>> I've googled this, but i found a lot of different opinions.
>> On the field, if somebody tested this options, can please share the
>> with me?
>I use a hand-held Arrow dual-band yagi for satellites.  During a pass,
>I have to rotate the antenna around its axis in order to get the best
>Bernhard VA6BMJ @ DO33FL
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