John,
From the information of the time I researched it soon after AO-51 was
launched, I recall it was linear but polarity was pointing angle dependent.
I used a patch LH rotation feed on a 20 MDS dish with great results using a
KG5NA down converter. Being circular there was one less variable to
Hi John!
Does anyone know the polarization of the 2.4 GHz transmissions from AO-51.
Are they circular? If so which polarity, RHCP or LHCP? Are they linear?
If so is there a preferred receiving polarization? I have examined the
AMSAT web site and many references on the Internet, but cannot
On 12/21/2010 2:56 PM, jmfranke wrote:
Does anyone know the polarization of the 2.4 GHz transmissions from AO-51.
Are they circular? If so which polarity, RHCP or LHCP? Are they linear?
If so is there a preferred receiving polarization? I have examined the
AMSAT web site and many references
John,
It is linear. You are right that the information exists, but is sometimes
not readily available. A good place to look is the Weekly Satellite Report
which AMSAT distributes. For many, but not all satellites, that information
is just below the frequency information. For AO-51 we find:
Hi John,
Both the S-band and L-band antennas are linear.
http://bach.as.arizona.edu/gallery/main.php?g2_itemId=8340g2_page=3
and
http://bach.as.arizona.edu/gallery/main.php?g2_itemId=8550
73!
Mark N8MH
At 02:56 PM 12/21/2010 -0500, jmfranke wrote:
Does anyone know the polarization of the
jmfranke wrote:
Does anyone know the polarization of the 2.4 GHz transmissions from AO-51.
Are they circular? If so which polarity, RHCP or LHCP? Are they linear?
Last Sunday I tried to receive the 2.4GHz downlink with a linear
polarized wifi patch and signals seem to be linear polarized. I
Many thanks to all who responded. The additional references were great!
Thanks to all,
John WA4WDL
--
From: Alan P. Biddle apbid...@united.net
Sent: Tuesday, December 21, 2010 3:10 PM
To: 'jmfranke' jmfra...@cox.net; amsat-bb@amsat.org
Subject:
Hi John, WA4WDL
On the 2.4 GHz from AO-51 the transmitting polarization is
Linear so that in theory for receiving 2.4 GHz RHCP or LHCP
on the ground station don't make difference.
AO-51 Mode and Antenna Polarization:
T: Linear
V: Linear
U: TX A (usually digital)LHCP
TX B (usually analog)
Timely info, as I am going to rebuild my directional satellite array
this week using:
144: M2 2M7 12.4-dBi (vert-pol)
432: M2 436CP24 14-dBic (est.) RHCP (rear half of 436CP42)
2401: L-com Patch 8-dBic RHCP
No L-band
http://www.kl7uw.com/MODSATTWR.jpg
I may add pol switch to the 432 x-yagi later
