Hi, My name is toyo (JG2RZF). As you know, pacific side of some of North-East region (JA7) of Japan is still power outage And we cannot see the APRS mobile in this area because of no IGATE activity. For example, we cannot see the trace of Wakayama Red Cross (JA3FRI-12) now.
Can we use satellite digi for this purpose?
We have advised Toyo san that ARISS APRS digipeater can be used over Japan for this purpose. Any APRS operators in the affected area can switch to ISS digipeater by simply changing frequency to 145.825. ISS is coming over Japan about 6 times a day in the afternoon.
The terrestrial path VIA WIDE?-? should work fine. But is better to change path to VIA ARISS so that the packets will be marked as having been digipeated by RS0ISS-4 each time.
We hope Astronauts can be sure to keep APRS digipeater operating over Japan on 145.825.
We hope that stations NOT in the disaster area can monitor the ISS downlink for emergency traffic and can IGATE the downlink into the APRS Internet System.
Bob, WB4APR
Is there someone who can get this message to the ISS Crew through official channels? I see that there are several school contacts coming up next week, and the crew often gets chatty with the ground afterwards. Under normal circumstances that's really appreciated, but this isn't the case, and I worry that the crew might not consider that their system is part of the relief effort unless notified.
Greg KO6TH
From: bruninga@usna.edu To: amsat-bb@amsat.org Date: Sun, 13 Mar 2011 00:10:42 -0500 Subject: [amsat-bb] ISS Digipeaer over Japan
Hi, My name is toyo (JG2RZF). As you know, pacific side of some of North-East region (JA7) of Japan is still power outage And we cannot see the APRS mobile in this area because of no IGATE activity. For example, we cannot see the trace of Wakayama Red Cross (JA3FRI-12) now.
Can we use satellite digi for this purpose?
We have advised Toyo san that ARISS APRS digipeater can be used over Japan for this purpose. Any APRS operators in the affected area can switch to ISS digipeater by simply changing frequency to 145.825. ISS is coming over Japan about 6 times a day in the afternoon.
The terrestrial path VIA WIDE?-? should work fine. But is better to change path to VIA ARISS so that the packets will be marked as having been digipeated by RS0ISS-4 each time.
We hope Astronauts can be sure to keep APRS digipeater operating over Japan on 145.825.
We hope that stations NOT in the disaster area can monitor the ISS downlink for emergency traffic and can IGATE the downlink into the APRS Internet System.
Bob, WB4APR _______________________________________________ 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
Toyo san,
A few more ideas. It is easy to manually estimate ISS pass times every day once you have heard a pass. See: http://aprs.org/MobileLEOtracking.html
1) ISS over Japan today is between about 0830 to 1830 JST.
2) When you hear the first pass, then you will have additional passes every 91 minutes or so that day.
3) Each day a given GOOD pass is 23 minutes later.
4) But overall-long-term pattern is moving earlier every other day by 51 minutes.
5) So in one week from now, the time window will be 0600 to 1600
6) The pass pattern is about the same. First 2 passes peak to the SE, then NW. Then a low northern pass, then the last two passes are NE and then SW.
You can get EXACT pass times from http://heavens-above.com and select a city. However, this web page does not show the 1 or 2 low passes each day below 10 degrees elevation.
The problem with using the ISS digipeater is that the survivors in the devistated area do not know the frequency (145.825). One way to solve this is to look for opportunity for someone to take a portable digipeater on an airplane over devistated area. The new TH-D72 HT can digipeat now! So have someone with a D72 catch a ride in an aircraft one day.
The D72 can BEACON on 144.64 a MESSAGE BULLETIN with info about the ISS digipeater and the time-window. WHile it is aloft, it can also act as a digipeater on Japanese APRS channel 144.64 and can also capture a list of any APRS stations or mobiles on the air.
The short bulletins might say something like this:
TO: BLN1 MSG: ISS Digi on 145.825 between 0830 to 1830
TO: BLN2 MSG: Passes are 6 min long every 91 minutes
TO: BLN3 MSG: Every day, passes are 23 minutes later
TO: BLN4 MSG: Time window moves EARLIER 51m every 2 days
Keep bulletins to under 45 characters to make sure that every radio display can see the full bulletin (D7 screen limit).
But in small area like Japan, I think it might be easier just to try to drive APRS mobiles (acting as digipeaters) to nearby hill tops on 144.64 normal APRS Japanese Frequency and keep everyone on same frequency without confusion.
Bob, WB4APR
At 07:28 AM 3/13/2011, Bob Bruninga wrote:
Toyo san,
A few more ideas. It is easy to manually estimate ISS pass times every day once you have heard a pass. See: http://aprs.org/MobileLEOtracking.html
ISS over Japan today is between about 0830 to 1830 JST.
When you hear the first pass, then you will have additional
passes every 91 minutes or so that day.
Each day a given GOOD pass is 23 minutes later.
But overall-long-term pattern is moving earlier every other day
by 51 minutes.
So in one week from now, the time window will be 0600 to 1600
The pass pattern is about the same. First 2 passes peak to the
SE, then NW. Then a low northern pass, then the last two passes are NE and then SW.
You can get EXACT pass times from http://heavens-above.com and select a city. However, this web page does not show the 1 or 2 low passes each day below 10 degrees elevation.
The problem with using the ISS digipeater is that the survivors in the devistated area do not know the frequency (145.825). One way to solve this is to look for opportunity for someone to take a portable digipeater on an airplane over devistated area. The new TH-D72 HT can digipeat now! So have someone with a D72 catch a ride in an aircraft one day.
The D72 can BEACON on 144.64 a MESSAGE BULLETIN with info about the ISS digipeater and the time-window. WHile it is aloft, it can also act as a digipeater on Japanese APRS channel 144.64 and can also capture a list of any APRS stations or mobiles on the air.
The short bulletins might say something like this:
TO: BLN1 MSG: ISS Digi on 145.825 between 0830 to 1830
TO: BLN2 MSG: Passes are 6 min long every 91 minutes
TO: BLN3 MSG: Every day, passes are 23 minutes later
TO: BLN4 MSG: Time window moves EARLIER 51m every 2 days
Keep bulletins to under 45 characters to make sure that every radio display can see the full bulletin (D7 screen limit).
All good suggestions except the last one. I think the road system is devastated as all the relief work has been by air in the severest hit areas. ~ Ed , KL7UW
But in small area like Japan, I think it might be easier just to try to drive APRS mobiles (acting as digipeaters) to nearby hill tops on 144.64 normal APRS Japanese Frequency and keep everyone on same frequency without confusion.
Bob, WB4APR
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
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 dubususa@hotmail.com ======================================
Toyo san,
One last idea.... Every D710 APRS mobile is automatically a digipeater by default 1) by its own callsign, and 2) in support of TRACEn-N.
So if someone is in a disaster or otherwise out of range of the normal WIDEn-N network, he can always send his packet via TRACE7-7 and he might get lucky and hit a nearby D710 or other APRS mobile.
Only the D710 comes with that enabled by defualt (so we can count on it always being there).. But since 2004 we have requested ALL APRS mobiles that can digipeat (includes tens of thousands of D700's) to set UITRACE TEMP so that all mobiles support this path. But not very many people have done this, so we do not have this reliable invivible backup network in many places.
To understand how it works, see www.aprs.org/TEMPn-N.html
Bob, WB4APR
---- Original message ----
Date: Sun, 13 Mar 2011 11:28:39 -0400 (EDT) From: amsat-bb-bounces@amsat.org (on behalf of "Bob Bruninga " bruninga@usna.edu) Subject: [amsat-bb] Re: ISS Digipeaer over Japan To: amsat-bb@amsat.org
Toyo san,
A few more ideas. It is easy to manually estimate ISS pass times every day once you have heard a pass. See: http://aprs.org/MobileLEOtracking.html
ISS over Japan today is between about 0830 to 1830 JST.
When you hear the first pass, then you will have additional passes every 91 minutes or so that day.
Each day a given GOOD pass is 23 minutes later.
But overall-long-term pattern is moving earlier every other day by 51 minutes.
So in one week from now, the time window will be 0600 to 1600
The pass pattern is about the same. First 2 passes peak to the SE, then NW. Then a low northern pass, then the last two passes are NE and then SW.
You can get EXACT pass times from http://heavens-above.com and select a city. However, this web page does not show the 1 or 2 low passes each day below 10 degrees elevation.
The problem with using the ISS digipeater is that the survivors in the devistated area do not know the frequency (145.825). One way to solve this is to look for opportunity for someone to take a portable digipeater on an airplane over devistated area. The new TH-D72 HT can digipeat now! So have someone with a D72 catch a ride in an aircraft one day.
The D72 can BEACON on 144.64 a MESSAGE BULLETIN with info about the ISS digipeater and the time-window. WHile it is aloft, it can also act as a digipeater on Japanese APRS channel 144.64 and can also capture a list of any APRS stations or mobiles on the air.
The short bulletins might say something like this:
TO: BLN1 MSG: ISS Digi on 145.825 between 0830 to 1830
TO: BLN2 MSG: Passes are 6 min long every 91 minutes
TO: BLN3 MSG: Every day, passes are 23 minutes later
TO: BLN4 MSG: Time window moves EARLIER 51m every 2 days
Keep bulletins to under 45 characters to make sure that every radio display can see the full bulletin (D7 screen limit).
But in small area like Japan, I think it might be easier just to try to drive APRS mobiles (acting as digipeaters) to nearby hill tops on 144.64 normal APRS Japanese Frequency and keep everyone on same frequency without confusion.
Bob, WB4APR
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
participants (3)
-
Bob Bruninga -
Edward R. Cole -
Greg D.