[amsat-bb] Re: AO-51 S-Band antenna polarization
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 contend with during the short duration passes of AO-51. The gain of the dish with the low noise figure of the down converter more than made up for the 3 dB loss from linear to circular. Art, KC6UQH -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of jmfranke Sent: Tuesday, December 21, 2010 11:57 AM To: amsat-bb@amsat.org Subject: [amsat-bb] AO-51 S-Band antenna polarization 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 seem to find the answer. Thanks, John WA4WDL AMSAT member 10211 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb __ Information from ESET NOD32 Antivirus, version of virus signature database 5719 (20101220) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5730 (20101224) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 S-Band antenna polarization
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 on. This is my minimized array to lower wind resistance and get a tracking array back up in mid-winter. I can consider restoring the fully antenna array next summer when able to lower the tower on hinge-over base using my pickup truck. At 11:10 AM 12/21/2010, Alan P. Biddle wrote: >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: > >Mode and Antenna Polarization: > >V: Linear >U: TX A (usually digital)LHCP >TX B (usually analog) RHCP >L: Linear >S: Linear > >Alan >WA4SCA > > > > > > >-Original Message- >From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On >Behalf Of jmfranke >Sent: Tuesday, December 21, 2010 1:57 PM >To: amsat-bb@amsat.org >Subject: [amsat-bb] AO-51 S-Band antenna polarization > >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 seem to find >the answer. > >Thanks, > >John WA4WDL AMSAT member 10211 > > >___ >Sent via amsat...@amsat.org. Opinions expressed are those of the author. >Not an AMSAT-NA member? Join now to support the amateur satellite program! >Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > > >___ >Sent via amsat...@amsat.org. Opinions expressed are those of the author. >Not an AMSAT-NA member? Join now to support the amateur satellite program! >Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw*, 432-100w*, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep dubus...@hotmail.com == *temp not in service ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 S-Band antenna polarization
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) RHCP L: Linear S: Linear 73" de i8CVS Domenico - Original Message - From: "jmfranke" To: Sent: Tuesday, December 21, 2010 8:56 PM Subject: [amsat-bb] AO-51 S-Band antenna polarization > 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 seem to find > the answer. > > Thanks, > > John WA4WDL AMSAT member 10211 > > > ___ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 S-Band antenna polarization
Many thanks to all who responded. The additional references were great! Thanks to all, John WA4WDL -- From: "Alan P. Biddle" Sent: Tuesday, December 21, 2010 3:10 PM To: "'jmfranke'" ; Subject: RE: [amsat-bb] AO-51 S-Band antenna polarization > 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: > > Mode and Antenna Polarization: > > V: Linear > U: TX A (usually digital)LHCP > TX B (usually analog) RHCP > L: Linear > S: Linear > > Alan > WA4SCA > > > > > > > -Original Message- > From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On > Behalf Of jmfranke > Sent: Tuesday, December 21, 2010 1:57 PM > To: amsat-bb@amsat.org > Subject: [amsat-bb] AO-51 S-Band antenna polarization > > 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 seem to > find > the answer. > > Thanks, > > John WA4WDL AMSAT member 10211 > > > ___ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > > > ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 S-Band antenna polarization
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 was all the pass rotating the antenna to get the better signal. Most of time signal was almost horizontally polarized. 73 de EA4EOZ ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 S-Band antenna polarization
Hi John, Both the S-band and L-band antennas are linear. http://bach.as.arizona.edu/gallery/main.php?g2_itemId=8340&g2_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 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 seem to find >the answer. > >Thanks, > >John WA4WDL AMSAT member 10211 > > >___ >Sent via amsat...@amsat.org. Opinions expressed are those of the author. >Not an AMSAT-NA member? Join now to support the amateur satellite program! >Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb Mark L. Hammond [N8MH] ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 S-Band antenna polarization
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: Mode and Antenna Polarization: V: Linear U: TX A (usually digital)LHCP TX B (usually analog) RHCP L: Linear S: Linear Alan WA4SCA -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of jmfranke Sent: Tuesday, December 21, 2010 1:57 PM To: amsat-bb@amsat.org Subject: [amsat-bb] AO-51 S-Band antenna polarization 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 seem to find the answer. Thanks, John WA4WDL AMSAT member 10211 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 S-Band antenna polarization
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 on the Internet, but cannot seem to find > the answer. > > Thanks, > > John WA4WDL AMSAT member 10211 > 435.300 is RHCP 435.150 is LHCP VHF, L, and S are linear 73, Drew KO4MA ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 S-Band antenna polarization
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 seem to find > the answer. It's linear. Page 7 in the PDF at: http://www.amsat.org/amsat-new/echo/OSCAR-E_Status_Report_5.pdf has a brief description and a picture of the L/S antenna on AO-51. 73! Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
