[amsat-bb] 9600baud digital satellites
Gentlemen, Most of the current cube sats and those to follow in the future all use data communications for transmitting telementry back to earth. In order to receive this data a ground station requires a TNC of some sort that can work up to 9600 baud. To those of you who are already using this type of equipment, how are you doing i,t what equipment are you using? David David G. Hopkins (VK4ZF) CAPALABA QLD AUSTRALIA 27.32.38S 153.12.03E QG62OL Skype :- davhop ___ 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] Need some ears to listen for VO-52, Northern EU, Canada, USA...
Hi AMSATs, I received the news that VO-52 will be switched on in a couple of hours from now, at 13:50UTC, (03-March-2012) Unfortunately the satellite will not pass over central Europe, and I am not able to check the status the first two orbits. I am looking for hams in Russia, Northern Europe, Canada, USA, or others that can listen for VO-52 right after it is turned on. ! ! ! Please don't use high uplink powers !!! (We don't want it to rise temperature very fast just after cold switch on) ! ! ! Please listen for the CW beacon at 145.860, which is a good reference. (Audio records and reports are very welcome at ISRO and myself) 73 de PE1RAH, William Leijenaar --- ___ 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: Need some ears to listen for VO-52, Northern EU, Canada, USA...
Hi AMSATs, There was a slip on my fingers. The date should be 13-March-2012. (Thanks to 9A2EY, Zeljko who noticed my mistake) 73 de PE1RAH, William Leijenaar Hi AMSATs, I received the news that VO-52 will be switched on in a couple of hours from now, at 13:50UTC, (03-March-2012) Unfortunately the satellite will not pass over central Europe, and I am not able to check the status the first two orbits. I am looking for hams in Russia, Northern Europe, Canada, USA, or others that can listen for VO-52 right after it is turned on. ! ! ! Please don't use high uplink powers !!! (We don't want it to rise temperature very fast just after cold switch on) ! ! ! Please listen for the CW beacon at 145.860, which is a good reference. (Audio records and reports are very welcome at ISRO and myself) 73 de PE1RAH, William Leijenaar --- ___ 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 help
I updated the keps and now when I open satpc32 I get a error message that keep repeating and the only way to abort the error message is to reboot. Removing the keep file does not fix the problem. Help?? Thank nick ___ 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] VO-52 PE1RAH Trxp Switching 'ON'
Dear VO-52 (HAMSAT) users, Subsequent to the clearance by the 'Expert committee' the Transponder # 2 (The Dutch Transponder made by William Leijenaar PE1RAH) on board HAMSAT V0-52 would be switched 'ON' at 13:42 UT on 13.03.2012 during orbit # 37080 over India. A 'Critical Comparative Signal Report' between the Indian and Dutch transponder would be of great help for further evaluations and necessary actions for the maintenance the transponder in good and healthy condition for better services and also, the inputs would be very valuable to the respective transponder designers. We all hope, Williams PE1RAH would be very happy with our decision and behalf of every one here in India involved with project, wish Williams and his transponder, once again all the very best and good luck. Thanks to AMSAT-India (Nitin VU3TYG) for the all the help and co-ordination provided. Mani, VU2WMY Secretary Station-In-Charge Upagrah Amateur Radio Club VU2URC ISRO Satellite Centre HAL Airport Road, Bangalore-560 017. Phone:(O)91-80-25082054/2598/2192 Mobile: 91-80-98803 41456 E-mail ID: w...@isac.gov.in vu2wmy_m...@yahoo.com isroh...@yahoo.com The official Announcement received at 08:19 UT from Mr. T. Parimalarangan, Operations Director VO-52, is herewith pasted. Dear Sir, 1 HAMSAT Payload Transponder-2 (Dutch) will be switched on TODAY at 13:50 Hrs UT / 13 March 2012 2 RF Specification of Transponder-2: Uplink frequency : 435.25 MHz Downlink frequency : 145.9 MHz Beacon: CW at 145.859330 MHz (145.86 MHz) Output level of Beacon Carrier: 18 dBm 3 Mr. Subramani VU2WMY, ISAC is requested to post the attachment in the website of HAM community, immediately. Also, the Real Time Feedback (on both the Indian visibility of this night) may please be conveyed through my mobile (0-9480 333 563). HAM users may be asked to send the performance report to my mail ID: tpran...@istrac.org 4 Performance of Transponder-2 shall be posted by 2130 Hrs IST (13.3.2012) With Best Regards, T PARIMALARANGAN OD (NP), HAMSAT ISTRAC/ISRO Ph: 080 - 2202 9011 (O) 080 - 2535 0132 (R) 0 - 9480333563 (M) 080 - 2202 9062 (F) -- Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. -- ___ 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: Need some ears to listen for VO-52, Northern EU, Canada, USA...
In a message dated 13/03/2012 09:00:18 GMT Standard Time, pe1...@yahoo.com writes: Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Hi William, Glad to receive the good news and i wish you and the team Good Luck - it has been greatly missed by many. However with the posting of the news I think perhaps the date should be 13th March 2012.. Kind regards Ken Eaton GW1FKY Amsat-UK Amsat NA ___ 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 help
I renamed the kep file and restarted satpc32 It then ask for a new file and I pointed to the previous file that worked before. At this point as soon as I say ok the program goes into a loop and I no longer have any control to do anything. The only way out is a reboot. What do I do next?? nick -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Nick Pugh Sent: Tuesday, March 13, 2012 4:34 AM To: amsat-bb@amsat.org Subject: [amsat-bb] satpc32 help I updated the keps and now when I open satpc32 I get a error message that keep repeating and the only way to abort the error message is to reboot. Removing the keep file does not fix the problem. Help?? Thank nick ___ 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] FW: satpc32 help
Keith, Sounds like you have a sat that is not longer in use in the Satellite sections of SATPC32. Trying and delete the decommissioned bird in between hitting the error icon. This has happened to me before. 73 de Angelo - If you don't ask, you will never know!! From: quadp...@bellsouth.net To: amsat-bb@amsat.org Date: Tue, 13 Mar 2012 04:33:38 -0500 Subject: [amsat-bb] satpc32 help I updated the keps and now when I open satpc32 I get a error message that keep repeating and the only way to abort the error message is to reboot. Removing the keep file does not fix the problem. Help?? Thank nick ___ 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: satpc32 help
Nick, Did you happen to use the backup utility that comes with SatPC32? That has saved me a number of times. I try to run it every couple of weeks, when things are running smoothly. Then, it's a restore from the same utility, to get things back to normal. Otherwise, you'll have to try deleting/replacing some of the .SQF files that have the most recent dates in them Mark N8MH On Tue, Mar 13, 2012 at 7:19 AM, Nick Pugh quadp...@bellsouth.net wrote: I renamed the kep file and restarted satpc32 It then ask for a new file and I pointed to the previous file that worked before. At this point as soon as I say ok the program goes into a loop and I no longer have any control to do anything. The only way out is a reboot. What do I do next?? nick -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Nick Pugh Sent: Tuesday, March 13, 2012 4:34 AM To: amsat-bb@amsat.org Subject: [amsat-bb] satpc32 help I updated the keps and now when I open satpc32 I get a error message that keep repeating and the only way to abort the error message is to reboot. Removing the keep file does not fix the problem. Help?? Thank nick ___ 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 -- Mark L. Hammond [N8MH] ___ 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: 9600baud digital satellites
Dave, There are a lot of TNCs around which will do 9600. I have a DSP-2232 which I used until recently. These days many are moving to using sound cards and software, such as MixW and the AGW Packet Engine. Whatever approach you take, remember that you need to use the rig connections for 9600 baud, rather than the usual ones for 300/1200 baud. Alan WA4SCA -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of David Hopkins Sent: Tuesday, March 13, 2012 3:35 AM To: amsat-bb@amsat.org Subject: [amsat-bb] 9600baud digital satellites Gentlemen, Most of the current cube sats and those to follow in the future all use data communications for transmitting telementry back to earth. In order to receive this data a ground station requires a TNC of some sort that can work up to 9600 baud. To those of you who are already using this type of equipment, how are you doing i,t what equipment are you using? David David G. Hopkins (VK4ZF) CAPALABA QLD AUSTRALIA 27.32.38S 153.12.03E QG62OL Skype :- davhop ___ 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: satpc32 help
Backup fix it Thanks Mark et all nick -Original Message- From: Mark L. Hammond [mailto:marklhamm...@gmail.com] Sent: Tuesday, March 13, 2012 7:04 AM To: Nick Pugh Cc: amsat-bb@amsat.org Subject: Re: [amsat-bb] Re: satpc32 help Nick, Did you happen to use the backup utility that comes with SatPC32? That has saved me a number of times. I try to run it every couple of weeks, when things are running smoothly. Then, it's a restore from the same utility, to get things back to normal. Otherwise, you'll have to try deleting/replacing some of the .SQF files that have the most recent dates in them Mark N8MH On Tue, Mar 13, 2012 at 7:19 AM, Nick Pugh quadp...@bellsouth.net wrote: I renamed the kep file and restarted satpc32 It then ask for a new file and I pointed to the previous file that worked before. At this point as soon as I say ok the program goes into a loop and I no longer have any control to do anything. The only way out is a reboot. What do I do next?? nick -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Nick Pugh Sent: Tuesday, March 13, 2012 4:34 AM To: amsat-bb@amsat.org Subject: [amsat-bb] satpc32 help I updated the keps and now when I open satpc32 I get a error message that keep repeating and the only way to abort the error message is to reboot. Removing the keep file does not fix the problem. Help?? Thank nick ___ 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 -- Mark L. Hammond [N8MH] ___ 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] VO-51 Update
Due to 'Operational Constraints' the commands to turn on the transponder were not been able to send. In-convenience caused is regretted. The next attempt would be made during 01:44 UT pass over India. On behalf of 'Operations Director-VO-52 Mani, VU2WMY ISRO Satellite Centre Bangalore, India -- Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. -- ___ 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: VO-51 Update
...you missed AO-51 don't you? :) 73's Peter VE7NGP -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Mani VU2WMY Sent: Tuesday, March 13, 2012 8:03 AM To: BB, AMSAT; AMSAT-INDIA; VUHAMS Cc: PE1RAH; VU3TYG Subject: [amsat-bb] VO-51 Update Due to 'Operational Constraints' the commands to turn on the transponder were not been able to send. In-convenience caused is regretted. The next attempt would be made during 01:44 UT pass over India. On behalf of 'Operations Director-VO-52 Mani, VU2WMY ISRO Satellite Centre Bangalore, India -- Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. -- ___ 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] Need help with AMSAT table, April 7-Raleigh, NC
Hi All, I am going to host an AMSAT table at the RARSFEST in Raleigh, NC on Saturday, April 7th (yes, Easter weekend). Anybody care to assist? We usually can't pull off demos, but hosting a table with toys+tracking programs usually draws some good attention and publicity. The RARS folks always make us feel welcome. Please contact me directly if you're willing and able to help. Thanks! -- Mark L. Hammond [N8MH] ___ 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: VO-51 Update
Hi Mani,VU2WMY and All, I will be monitoring for VO-52 during the first descending orbit Nr 37091 at 06:27 UTC day March 14, 2012 available from Italy. Finger crossed ! 73 de i8CVS Domenico - Original Message - From: Mani VU2WMY w...@isac.gov.in To: BB, AMSAT amsat-bb@amsat.org; AMSAT-INDIA amsatin...@yahoogroups.com; VUHAMS vuh...@yahoogroups.com Cc: PE1RAH pe1...@yahoo.com; VU3TYG vu3...@yahoo.co.in Sent: Tuesday, March 13, 2012 4:02 PM Subject: [amsat-bb] VO-52 Update Due to 'Operational Constraints' the commands to turn on the transponder were not been able to send. In-convenience caused is regretted. The next attempt would be made during 01:44 UT pass over India. On behalf of 'Operations Director-VO-52 Mani, VU2WMY ISRO Satellite Centre Bangalore, India ___ 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: VO-51 Update
Hi Domenico, Unable to listen, but I will follow amsat-bb and hope to read that VO-52 and the Dutch transponder is operational ;-) 73 Jan PE0SAT -- With regards PE0SAT Internet web-page http://www.pe0sat.vgnet.nl/ On Tue, March 13, 2012 20:10, i8cvs wrote: Hi Mani,VU2WMY and All, I will be monitoring for VO-52 during the first descending orbit Nr 37091 at 06:27 UTC day March 14, 2012 available from Italy. Finger crossed ! 73 de i8CVS Domenico - Original Message - From: Mani VU2WMY w...@isac.gov.in To: BB, AMSAT amsat-bb@amsat.org; AMSAT-INDIA amsatin...@yahoogroups.com; VUHAMS vuh...@yahoogroups.com Cc: PE1RAH pe1...@yahoo.com; VU3TYG vu3...@yahoo.co.in Sent: Tuesday, March 13, 2012 4:02 PM Subject: [amsat-bb] VO-52 Update Due to 'Operational Constraints' the commands to turn on the transponder were not been able to send. In-convenience caused is regretted. The next attempt would be made during 01:44 UT pass over India. On behalf of 'Operations Director-VO-52 Mani, VU2WMY ISRO Satellite Centre Bangalore, India ___ 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] G5500 Azimuth Rotator Update
Hi Everyone, Here's a quick update on my G5500 Azimuth rotator story. (Recall that three weeks ago I stalled the rotator after switching antennas.) Yaesu Parts USA is still backordered on the replacement motors, possibly some will arrive from Japan in a few more weeks (or possibly not). The company that I sent the motor to in LA (Eurton Electric) just gave me a quote today for the rewinding cost: $365. That's close to $3X what the motors go for new (if you can find one!), so at least with them it's not cost-effective to repair the motor. I'm having the motor shipped back, and I'll either try to rewind it myself, maybe someone else who can rewind it, or buy a replacement sometime in the future. To get the antennas back on the air, I decided last week that it would be good to have a spare -- so I ended up purchasing a replacement G5500 system and installing the azimuth rotator this last weekend. Everything's working great so far! I also added a thermal cut-out switch to the motor to prevent a similar stall-induced-motor-burnout in the future. If anyone is interested in how I installed the switch (or what a G5500 azimuth rotator looks like inside), I've added pictures to my blog at: http://kb5wia.blogspot.com/2012/03/az-el-antenna-system-new-70cm-yagi-and.html 73! Dave KB5WIA ___ 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: VO-51 Update
Hi Mani, VU2WMY I would like to know from you if the attempt to switch ON the Dutch transponder on VO-52 at 01:44 UTC, March 14 2012 was succesfull or not. Actually at 02:09 UTC and 07:39 local time over India there, are no messages about on AMSAT-BB By the way I will monitor the orbit 37091 at 06:27 over Europe. 73 de i8CVS Domenico - Original Message - From: Mani VU2WMY w...@isac.gov.in To: BB, AMSAT amsat-bb@amsat.org; AMSAT-INDIA amsatin...@yahoogroups.com; VUHAMS vuh...@yahoogroups.com Cc: PE1RAH pe1...@yahoo.com; VU3TYG vu3...@yahoo.co.in Sent: Tuesday, March 13, 2012 4:02 PM Subject: [amsat-bb] VO-51 Update Due to 'Operational Constraints' the commands to turn on the transponder were not been able to send. In-convenience caused is regretted. The next attempt would be made during 01:44 UT pass over India. On behalf of 'Operations Director-VO-52 Mani, VU2WMY ISRO Satellite Centre Bangalore, India -- Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. -- ___ 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: G5500 Azimuth Rotator Update
Hi Dave, How long does one have to stall the motor before the windings' insulation starts to degrade? I seem to recall it's not very long (less than minutes). With all that thermal mass, and the insulation from the heat shrink tubing, is the thermal switch really going to be effective mounted that way? I would have thought it needed to be buried in the windings themselves somehow (though I can't imagine getting good thermal contact there either). Great pictures, by the way. Greg KO6TH David Palmer KB5WIA wrote: Hi Everyone, Here's a quick update on my G5500 Azimuth rotator story. (Recall that three weeks ago I stalled the rotator after switching antennas.) Yaesu Parts USA is still backordered on the replacement motors, possibly some will arrive from Japan in a few more weeks (or possibly not). The company that I sent the motor to in LA (Eurton Electric) just gave me a quote today for the rewinding cost: $365. That's close to $3X what the motors go for new (if you can find one!), so at least with them it's not cost-effective to repair the motor. I'm having the motor shipped back, and I'll either try to rewind it myself, maybe someone else who can rewind it, or buy a replacement sometime in the future. To get the antennas back on the air, I decided last week that it would be good to have a spare -- so I ended up purchasing a replacement G5500 system and installing the azimuth rotator this last weekend. Everything's working great so far! I also added a thermal cut-out switch to the motor to prevent a similar stall-induced-motor-burnout in the future. If anyone is interested in how I installed the switch (or what a G5500 azimuth rotator looks like inside), I've added pictures to my blog at: http://kb5wia.blogspot.com/2012/03/az-el-antenna-system-new-70cm-yagi-and.html 73! Dave KB5WIA ___ 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] VO-52 Update
Hello Domenico, Not attempted during 01:44 UT pass. Probably the command station may give a try during the next pass at 03:20 UT. Not received any updates from them yet. Will keep you all informed with the ongoing developments. 73 de Mani VU2WMY -- Hi Mani, VU2WMY I would like to know from you if the attempt to switch ON the Dutch transponder on VO-52 at 01:44 UTC, March 14 2012 was succesfull or not. Actually at 02:09 UTC and 07:39 local time over India there, are no messages about on AMSAT-BB By the way I will monitor the orbit 37091 at 06:27 over Europe. 73 de i8CVS Domenico -- Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. -- ___ 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] VO52 not heard @ 0245 UTC pass
Hi! I was outside for the 0245 UTC VO52 pass here in central Arizona (DM43), and heard nothing from the transponder or the CW beacon. That was a 74-degree pass here, which should have been easy to copy. 73! Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ ___ 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: VO-52 Update
Hi Mani, VU2WMY The next pass at 03:20 UTC over India is just actually in process and I hope to hear VO-52 over Europe at 06:27 UTC Thanks for your informations. 73 de i8CVS Domenico - Original Message - From: Mani VU2WMY w...@isac.gov.in To: BB, AMSAT amsat-bb@amsat.org; AMSAT-INDIA amsatin...@yahoogroups.com; vuh...@yahoogroups.com Cc: PE1RAH pe1...@yahoo.com; VU3TYG vu3...@yahoo.co.in Sent: Wednesday, March 14, 2012 4:03 AM Subject: [amsat-bb] VO-52 Update Hello Domenico, Not attempted during 01:44 UT pass. Probably the command station may give a try during the next pass at 03:20 UT. Not received any updates from them yet. Will keep you all informed with the ongoing developments. 73 de Mani VU2WMY -- Hi Mani, VU2WMY I would like to know from you if the attempt to switch ON the Dutch transponder on VO-52 at 01:44 UTC, March 14 2012 was succesfull or not. Actually at 02:09 UTC and 07:39 local time over India there, are no messages about on AMSAT-BB By the way I will monitor the orbit 37091 at 06:27 over Europe. 73 de i8CVS Domenico -- Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. -- ___ 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: G5500 Azimuth Rotator Update
Hi Greg KO6TH and Dave KB5WIA I have always seen the thermal switches buried into the windings themselves both for transformers and motors. To prevent short circuits between turns of the windwing is better to use # 24 fiber glass copper insulated wire for class H insulation of motors or transformers wich windstand constantly very high temperature around 180° C, Celsius i.e. 356 ° Fahrenheit. I have used the above wire with success in critical thermal applications to industrially rewind DC and AC motors working close to lead melting fornaces in a steel plant in Italy. 73 de i8CVS Domenico - Original Message - From: Greg D ko6th.g...@gmail.com To: David Palmer KB5WIA kb5...@amsat.org Cc: amsat-bb@amsat.org Sent: Wednesday, March 14, 2012 3:41 AM Subject: [amsat-bb] Re: G5500 Azimuth Rotator Update Hi Dave, How long does one have to stall the motor before the windings' insulation starts to degrade? I seem to recall it's not very long (less than minutes). With all that thermal mass, and the insulation from the heat shrink tubing, is the thermal switch really going to be effective mounted that way? I would have thought it needed to be buried in the windings themselves somehow (though I can't imagine getting good thermal contact there either). Great pictures, by the way. Greg KO6TH David Palmer KB5WIA wrote: Hi Everyone, Here's a quick update on my G5500 Azimuth rotator story. (Recall that three weeks ago I stalled the rotator after switching antennas.) Yaesu Parts USA is still backordered on the replacement motors, possibly some will arrive from Japan in a few more weeks (or possibly not). The company that I sent the motor to in LA (Eurton Electric) just gave me a quote today for the rewinding cost: $365. That's close to $3X what the motors go for new (if you can find one!), so at least with them it's not cost-effective to repair the motor. I'm having the motor shipped back, and I'll either try to rewind it myself, maybe someone else who can rewind it, or buy a replacement sometime in the future. To get the antennas back on the air, I decided last week that it would be good to have a spare -- so I ended up purchasing a replacement G5500 system and installing the azimuth rotator this last weekend. Everything's working great so far! I also added a thermal cut-out switch to the motor to prevent a similar stall-induced-motor-burnout in the future. If anyone is interested in how I installed the switch (or what a G5500 azimuth rotator looks like inside), I've added pictures to my blog at: http://kb5wia.blogspot.com/2012/03/az-el-antenna-system-new-70cm-yagi-and.ht ml 73! Dave KB5WIA ___ 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 ___ 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: G5500 Azimuth Rotator Update
Hi Greg, Hey, thanks! Good question about how long it takes the windings to degrade. Haven't tested this myself, but I'd seen a post a while back where someone measured current draw on the motor, and found that it's actually almost the same between normal operation and a full stall. That also could be the reason why the 1-Amp fuse I installed in the controller (which was barely enough to run the motors without blowing - a 0.75-Amp fuse I tried blew) never blew throughout my motor stall. So with similar current and voltage in a stall as compared to normal use, that should mean the power consumed (and heat generated) would be similar whether the motor is running or stalled. When I was bench testing the rotator, after maybe 5 full trips to 450 degrees and back (perhaps 10-15 minutes of continuous motor operation) the thermal switch rated at 75C tripped open. So that means the switch is sensing the motor heat, and that it seems in normal operation the motor can go from ambient to 75C (or more) in 10+ minutes. Hard to tell what the failure temp of the enamel wire in that motor is, but let's guess 120 degrees to be conservative. That would give a very rough ballpark of 20 mins stall (or 20mins continuous back-and-forth with no stops) to raise the temp by 100C to cook the motor. You're right about thermal mass and winding temps -- certainly the windings will be hotter than the motor chassis. Will cutting power to the motor when the chassis gets to 75C protect it? Don't know for certain, but after my last experience, I'm adding this insurance, since it's better than no protection! :-) (doesn't beat common sense tho -- if I had more of that, I would have checked antenna clearance before letting the computer run the sat array automatically!) 73 de Dave KB5WIA! On Wed, Mar 14, 2012 at 2:41 AM, Greg D ko6th.g...@gmail.com wrote: Hi Dave, How long does one have to stall the motor before the windings' insulation starts to degrade? I seem to recall it's not very long (less than minutes). With all that thermal mass, and the insulation from the heat shrink tubing, is the thermal switch really going to be effective mounted that way? I would have thought it needed to be buried in the windings themselves somehow (though I can't imagine getting good thermal contact there either). Great pictures, by the way. Greg KO6TH ___ 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: VO-52 Update
Hi Domenico and others, Commands were sent during 03:20 UT pass over India. But, unfortunately the commands were not been acknowledged and confirmed by the telemetry. The next opportunity is at 14:00 UT 35 deg ascending pass over Bangalore, India. we are trying our best to restore the services at the earliest with the constrain of having a single command control station for VO-52. we do hope that, we'll be successful in our efforts, very soon. Mani VU2WMY Quoting i8cvs domenico.i8...@tin.it: Hi Mani, VU2WMY The next pass at 03:20 UTC over India is just actually in process and I hope to hear VO-52 over Europe at 06:27 UTC Thanks for your informations. 73 de i8CVS Domenico - Original Message - From: Mani VU2WMY w...@isac.gov.in To: BB, AMSAT amsat-bb@amsat.org; AMSAT-INDIA amsatin...@yahoogroups.com; vuh...@yahoogroups.com Cc: PE1RAH pe1...@yahoo.com; VU3TYG vu3...@yahoo.co.in Sent: Wednesday, March 14, 2012 4:03 AM Subject: [amsat-bb] VO-52 Update Hello Domenico, Not attempted during 01:44 UT pass. Probably the command station may give a try during the next pass at 03:20 UT. Not received any updates from them yet. Will keep you all informed with the ongoing developments. 73 de Mani VU2WMY -- Hi Mani, VU2WMY I would like to know from you if the attempt to switch ON the Dutch transponder on VO-52 at 01:44 UTC, March 14 2012 was succesfull or not. Actually at 02:09 UTC and 07:39 local time over India there, are no messages about on AMSAT-BB By the way I will monitor the orbit 37091 at 06:27 over Europe. 73 de i8CVS Domenico -- Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. -- ___ 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] Interplanetary CubeSat Workshop
Dear AMSAT community, I am writing to inform you of a new conference that may be of interest to you. Cornell and MIT are organizing the 1st Interplanetary CubeSat Workshop. The conference will be held at the end of May this year at MIT, and abstracts are now being accepted for technical talks. The event website describing keynote speakers, program details and other information can be accessed at: www.iCubeSat.org Thanks, Rodrigo Zeledon on behalf of the iCubeSat2012 organizing committee ___ 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: UPDATED AMATEUR SATELLITE FREQUENCY COORDINATION REQUEST
Hi Hans, thanks for reminding us the role of IARU for the amateur satellite frequency coordination. However in the most recent years the number of satellite launched by universities in the amateur bands is growing faster and faster. Are all these satellites coordinated by the relevant universities? Do you have a list of satellites already launched with an indication of their compliance with IARU rules and possibly with ITU rules. I do not know if any action is made by IARU, through its national members, with respect to entities which do not fulfil these rules, and the IARU Bandplans as well. It is important for IARU, in my understanding to monitor the situation. 73, Emanuele I0ELE Il 13/03/2012 21.13, Hans ha scritto: Frequency coordination for amateur radio satellites is provided by the IARU through its Satellite Advisor, an official appointed by the IARU Administrative Council, its top policymaking body. The IARU Satellite Advisor is assisted by an Advisory Panel of qualified amateurs from all three IARU Regions. The panel meets regularly via Skype to consider amateur satellite frequency coordination requests for satellites planned for operation on frequencies in the amateur service. The panel members often provide advice and assist satellite builders with the selection of the best possible frequencies to meet the objectives of their mission. The Amateur Satellite Frequency Coordination request form has been updated (Version 27) and is available for download from www.iaru.org/satellite. On the IARU web satellite page there are also available a number of guideline documents which will assist satellite builders, including a document on the ITU requirements for Amateur Radio Satellites. . 73 Hans ZS6AKV Hans van de Groenendaal IARU Satellite Advisor ___ 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
