[amsat-bb] Re: Circular polarization
Hi Bob, W7LRD Your provider @comcast.net rejects my post to you via my provider @tin.it BTW I will try to send you the article. Please let me know if it arrives. 73 de i8CVS Domenico - Original Message - From: Bob- W7LRD To: i8cvs Sent: Monday, May 14, 2012 7:23 AM Subject: Re: [amsat-bb] Re: Circular polarization Hello Domenico...I would like to see that information 73 Bob W7LRD -- From: i8cvs domenico.i8...@tin.it To: David 4X1DG 4x...@iarc.org, Amsat - BBs amsat-bb@amsat.org Sent: Sunday, May 13, 2012 4:12:04 PM Subject: [amsat-bb] Re: Circular polarization - Original Message - From: David 4X1DG 4x...@iarc.org To: amsat-bb@amsat.org Sent: Sunday, May 13, 2012 6:30 PM Subject: [amsat-bb] Circular polarization Is a UHF circular polarization antenna needed for the current operational satellites? I am planning some work on my antenna system and wonder if the CP is needed, or actually, deteriorate the signal by 3dB if the satellites are using linear antennae?? Hi David, 4X1DG It is a long matter to explain in a few words so that in a separate email I have sent to you the 5 MB zipped file of the following nice article: The Advantages of Circular Polarization for Amateur Satellite Ground Stations by John J. Nagle, K4KJ I can send the above artiche to anybody interested to it. 73 de i8CVS Domenico ___ Sent via AMSAT-BB@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-BB@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: Go Erie - Students Building Part of AMSAT satellite
--- On Mon, 14/5/12, Anthony Monteiro aa...@comcast.net wrote: AMSAT sponsored this senior design project at Penn State for the 2011-2012 academic year. The students developed a super-capacitor based energy storage device to replace the battery on ARISSat type satellites. A plug-in replacement for the silver zinc battery, sounds good, hope an opportunity to fly it comes up soon. 73 Trevor M5AKA ___ Sent via AMSAT-BB@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] Fw: Update: DELFI C3 Close Approach Message
Good Morning, UPDATE #2 73 WB2OQQ Subject: Update: DELFI C3 Close Approach Message Sir/Ma'am, The United States Joint Space Operations Center (JSpOC) has updated a predicted conjunction between DELFI C3 (SCC# 32789) and SCC# 3569. Primary Object: DELFI C3 (SCC# 32789) Secondary Object: SCC# 3569 Time of Closest Approach: 15 MAY 2012 06:38 UTC Overall miss distance: 307 meters Radial (dU) miss distance: 126 meters In-Track (dV) miss distance: 228 meters Cross-track (dW) miss distance: -162 meters Primary Radial Error (U): 17 meters Primary In-track Error (V): 533 meters Primary Cross-track Error (W): 29 meters Secondary Radial Error (U): 17 meters Secondary In-track Error (V): 216 meters Secondary Cross-track Error (W): 31 meters Please reply to this message to acknowledge receipt of this close approach notification. Very Respectfully, JSpOC Orbital Protection Team Joint Space Operations Center Vandenberg Air Force Base, California USA NO WARRANTIES: The United States provides the enclosed Space Situational Awareness (SSA) services or information as is and makes no warranty, either express or implied, as to the condition or suitability of the information and services, nor its fitness for a particular purpose. IMMUNITY: The United States, any agencies and instrumentalities thereof, and any individuals, firms, corporations, and other persons acting for the United States, shall be immune from any suit in any court for any cause of action arising from the provision or receipt of SSA services or information, whether or not provided in accordance with 10 USC 2274, or any related action or omission. ___ Sent via AMSAT-BB@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] Tis Me,
Return Mail to wa1...@yahoo.com Alls quiet on the home front, got trash cans emptied, bed made, and laundry is in the works one load drying another washing ,quiet all way round nothing happening on the airwaves even the bands are dead. so time to go check the laundry later Dudette. de Das Washer Man ___ Sent via AMSAT-BB@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: SatPC32 issue
Nevermind, I finally was faster than the error dialog box. Dave - KB1PVH Sent from my Verizon Wireless DROID X ___ Sent via AMSAT-BB@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] SatPC32 issue
I was trying to do another configuration on SatPC32, when I clicked on Configuration 2 I get a pop up that says E/H Fehler 105 and I can't get out of the loop. Any suggestions? Dave - KB1PVH Sent from my Verizon Wireless DROID X ___ Sent via AMSAT-BB@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] Fw: Update: DELFI C3 Close Approach Message
UPDATE #3 73 WB2OQQ Sir/Ma'am, The United States Joint Space Operations Center (JSpOC) has updated a predicted conjunction between DELFI C3 (SCC# 32789) and SCC# 3569. Primary Object: DELFI C3 (SCC# 32789) Secondary Object: SCC# 3569 Time of Closest Approach: 15 MAY 2012 06:38 UTC Overall miss distance: 205 meters Radial (dU) miss distance: 151 meters In-Track (dV) miss distance: -118 meters Cross-track (dW) miss distance: 74 meters Primary Radial Error (U): 18 meters Primary In-track Error (V): 171 meters Primary Cross-track Error (W): 31 meters Secondary Radial Error (U): 16 meters Secondary In-track Error (V): 178 meters Secondary Cross-track Error (W): 31 meters Very Respectfully, JSpOC Orbital Protection Team Joint Space Operations Center Vandenberg Air Force Base, California USA NO WARRANTIES: The United States provides the enclosed Space Situational Awareness (SSA) services or information as is and makes no warranty, either express or implied, as to the condition or suitability of the information and services, nor its fitness for a particular purpose. IMMUNITY: The United States, any agencies and instrumentalities thereof, and any individuals, firms, corporations, and other persons acting for the United States, shall be immune from any suit in any court for any cause of action arising from the provision or receipt of SSA services or information, whether or not provided in accordance with 10 USC 2274, or any related action or omission. ___ Sent via AMSAT-BB@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: Circular polarization
Hi David, Here is my advice: If you choose circular, you really need to be able to switch between RHCP and LHCP. If you are fixed on only one polarity, you are worse off then just using vertical (or horizontal). So, if you cannot switch, I suggest vertical (or horizontal if you do SSB local/DX). 73, Mark N8MH At 07:30 PM 5/13/2012 +0300, David 4X1DG wrote: Is a UHF circular polarization antenna needed for the current operational satellites? I am planning some work on my antenna system and wonder if the CP is needed, or actually, deteriorate the signal by 3dB if the satellites are using linear antennae?? ___ Sent via AMSAT-BB@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-BB@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
