Gentlemen,
Please do not use D-Star via AO-51. If you want to try D-Star on satellite right now, use AO-27 where the control ops welcome it, or request some time set aside on AO-51 via the ao51-modes email address. The repeater modes on AO-51 are for analog voice only unless otherwise designated in the monthly schedule. Request some time on a second repeater to try the mode and it -will- be approved, but do not mix it up with the analog users.
73, Drew KO4MA AMSAT-NA VP Operations
-----Original Message-----
From: Luc Leblanc lucleblanc6@videotron.ca Sent: Apr 25, 2009 5:27 PM To: kb1pvh@gmail.com Cc: amsat-bb@amsat.org Subject: [amsat-bb] Re: DSTAR vs AO-51
On 25 Apr 2009 at 19:18, Dave Webb KB1PVH wrote:
Hey Luc, I can TX on DSTAR tonight, but I do not have the S mode capability. There is a close pass at 22:42 utc that I am willing to TX for you. Let me know.
Dave KB1PVH
I will listen to you and will try to record with scanrec. Try 2 or 3 transmissions only when the satellite will be in your best range as you cannot hear your downlink you can step over someone else QSO
Thank,s
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
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On 26 Apr 2009 at 0:56, Andrew Glasbrenner wrote:
Gentlemen,
Please do not use D-Star via AO-51. If you want to try D-Star on satellite right now, use AO-27 where the control ops welcome it, or request some time set aside on AO-51 via the ao51-modes email address. The repeater modes on AO-51 are for analog voice only unless otherwise designated in the monthly schedule. Request some time on a second repeater to try the mode and it -will- be approved, but do not mix it up with the analog users.
73, Drew KO4MA AMSAT-NA VP Operations
Hi Drew
As i wrote in my previous message:
"As the first DSTAR satellite transmission has been made on AO-27 i don't know if the same test can be perform on AO-51."
I was asking a question only to know if as AO-27 DSTAR can be pass through AO-51. I guess the answer is yes as per your offer to ask for it in the monthly schedule? I choose this the last days of V/S mode to avoid "messing" with analog users.
From my first checking i will have to use another V/S session and i will have to switch my downconverter IF from 123mhz to 144mhz as my IC-
2200H digital mode does not operate out of the amateur band. (Always a last minute surprise when you test something...)
Just hope this new digital mode will be used on other sat as the audio quality is interference free and i don't know if DSTAR can solved the usual pagers QRM on the uplink and some other always curious sound we heard during this V/S session?
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
At 01:31 AM 4/27/2009, Luc Leblanc wrote:
I was asking a question only to know if as AO-27 DSTAR can be pass through AO-51. I guess the answer is yes as per your offer to ask for it in the monthly schedule? I choose this the last days of V/S mode to avoid "messing" with analog users.
I'm not sure that V/S is a good idea, with the extreme Doppler shift. Take Drew's suggestion and get some time scheduled on the second transponder for D-STAR (preferably on mode V/U). Having it in the schedule means the rest of the world can give it a try as well. :)
73 de VK3JED / VK3IRL http://vkradio.com
Is there a list of Sats by all there names. Such as AO-51 ( AMSAt ECHO )? John
From the heart of
Central Minnesota John P. Hengel See my site at: www.geocities.com/JPHENGEL/JPHENGEL
W0JPH ( HAM ) MONITOR 146.94 REPEATER WPZT205 (GMRS) MONITOR 462.675
Date: Mon, 27 Apr 2009 06:42:47 +1000 To: lucleblanc6@videotron.ca; amsat-bb@amsat.org From: vk3jed@gmail.com Subject: [amsat-bb] Re: DSTAR vs AO-51
At 01:31 AM 4/27/2009, Luc Leblanc wrote:
I was asking a question only to know if as AO-27 DSTAR can be pass through AO-51. I guess the answer is yes as per your offer to ask for it in the monthly schedule? I choose this the last days of V/S mode to avoid "messing" with analog users.
I'm not sure that V/S is a good idea, with the extreme Doppler shift. Take Drew's suggestion and get some time scheduled on the second transponder for D-STAR (preferably on mode V/U). Having it in the schedule means the rest of the world can give it a try as well. :)
73 de VK3JED / VK3IRL http://vkradio.com
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
On 27 Apr 2009 at 6:42, Tony Langdon wrote:
At 01:31 AM 4/27/2009, Luc Leblanc wrote:
I was asking a question only to know if as AO-27 DSTAR can be pass through AO-51. I guess the answer is yes as per your offer to ask for it in the monthly schedule? I choose this the last days of V/S mode to avoid "messing" with analog users.
I'm not sure that V/S is a good idea, with the extreme Doppler shift. Take Drew's suggestion and get some time scheduled on the second transponder for D-STAR (preferably on mode V/U). Having it in the schedule means the rest of the world can give it a try as well. :)
73 de VK3JED / VK3IRL http://vkradio.com
That's exactly what i discover compensating for doppler in 5kc steps is probably not enough on on the downconverter IF it puts the signal too much in the on an off state having to play back and forth with the knob. My problem is a rig limitation i'm stuck with a monoband DSTAR radio making it useless on V/U mode. The only one way is to find a way to convert UHF to VHF in the 144mhz region to avoid desense. As far i remember it is far from an ideal solution but i think some are able to do it?
I note Drew's offer but due to my rig limitation i will not be able to use it. This don't mean if someone else with a DSTAR dual band want's to try i will not try to uplink few data stream but i will not be able to hear myself :(
Again with what i have here S mode can work as i will only have to change my Down Converter IF from 123mhz to 145mhz that can be done easily with but the 5kc steps issue. On some rig the steps are adjustable i don't know if the IC2200H can do that as the menus settings on this rig is probably the worse i never seen yet. You have to have manual always with you...
P.S. I don't know why nobody never speak about DSTAR here on this BB as some are avid data satellites advocate and DSTAR can transmit APRS signal called DPRS plus voice at the same time even slow data messages? Is two DSTAR modules plus a controller unit operating cross band flying aboard ISS is possible? With an high speed data 1.2ghz module is it possible to have fast internet access from space? Tapping in the next internet ISS lan system? I'm guessing Icom can be interested to offer the hardware if it's to be flown aboard ISS!! In bonus it will offer some spare/off time activities for the next 6 members crew. Could be ARISS can be interested too?
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
At 06:03 PM 4/27/2009, Luc Leblanc wrote:
On 27 Apr 2009 at 6:42, Tony Langdon wrote:
That's exactly what i discover compensating for doppler in 5kc steps is probably not enough on on the downconverter IF it puts the signal too much in the on an off state having to play back and forth with the knob. My problem is a rig limitation i'm stuck with a monoband DSTAR radio making it useless on V/U mode. The only one way is to find a way to convert UHF to VHF in the 144mhz region to avoid desense. As far i remember it is far from an ideal solution but i think some are able to do it?
I see. I can't run duplex in D-STAR anyway, would need a second radio, or an FM box with Jakub's D-STAR Decoder software and a DV Dongle running on a PC. That could solve the 5 kHz step problem, because I could tap the discriminator of an all mode radio, and tune in 1 kHz or smaller steps. I would need to use a 70cm downconverter, as I have no all mode gear on 70cm, but I happen to have one of those handy. Hmm, might be a worthwhile project for those of us D-STAR users with spare gear and a dongle, and are able to do the necessary mods.
I note Drew's offer but due to my rig limitation i will not be able to use it. This don't mean if someone else with a DSTAR dual band want's to try i will not try to uplink few data stream but i will not be able to hear myself :(
Cooperation between a few local hams would yield results, as would the method above.
Again with what i have here S mode can work as i will only have to change my Down Converter IF from 123mhz to 145mhz that can be done easily with but the 5kc steps issue. On some rig the steps are adjustable i don't know if the IC2200H can do that as the menus settings on this rig is probably the worse i never seen yet. You have to have manual always with you...
Most FM rigs have 5 kHz as the smallest step available. The problem with 2.4 GHz is the insane rate of Doppler shift, unless you have computer control of something in the chain, it's going to be extremely difficult to maintain a lock on D-STAR, especially if you're stuck with 5 kHz steps. I don't have computer control here, so that's not an option for me.
P.S. I don't know why nobody never speak about DSTAR here on this BB as some are avid data satellites advocate and DSTAR can transmit APRS signal called DPRS plus voice at the same time even slow data messages? Is two DSTAR modules plus a controller unit operating cross band flying aboard ISS is possible? With an high speed data 1.2ghz module is it possible to have fast internet access from space? Tapping in the next internet ISS lan system? I'm guessing Icom can be interested to offer the hardware if it's to be flown aboard ISS!! In bonus it will offer some spare/off time activities for the next 6 members crew. Could be ARISS can be interested too?
I can't see 1.2 GHz working. As far as I know, it's an uplink only band, and DD mode works in simplex mode, so it wouldn't be legal in the Amateur Satellite service, without modification to work split band (say 1.2/2.4 GHz). Haven't done the path loss calculations, to see if it's viable with 10W and a decent gain antenna.
73 de VK3JED / VK3IRL http://vkradio.com
participants (4)
-
Andrew Glasbrenner -
JOHN HENGEL -
Luc Leblanc -
Tony Langdon