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CX2SA > SATDIG 12.05.18 21:52l 846 Lines 25444 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: Three CubeSats deploy from ISS 1030z 11th May (Rustem Aslan)
2. StaPC Satellite list (Vincenzo Mone)
3. Re: StaPC Satellite list (Pedro Converso)
4. Re: StaPC Satellite list (Erich Eichmann)
5. Re: Three CubeSats deploy from ISS 1030z 11th May (Scott Harvey)
6. FUNcube-1 mode change (Graham Shirville)
7. NASA needs amateur help with IMAGE spacecraft recovery
(Joe Fitzgerald)
8. UBAKUSAT (Jean-Pierre Godet)
9. Re: UBAKUSAT (Scott)
10. when are TLE's too old to use? (Ron VE8RT)
11. Re: when are TLE's too old to use? (Andrew Glasbrenner)
12. Re: when are TLE's too old to use? (Armand SP3QFE)
13. Re: when are TLE's too old to use? (Mark D. Johns)
----------------------------------------------------------------------
Message: 1
Date: Fri, 11 May 2018 22:31:13 +0900
From: Rustem Aslan <aslanr@???.???.??>
To: "Alfredos (fredy) Damkalis" <fredy@?????.??>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] Three CubeSats deploy from ISS 1030z 11th May
Message-ID: <7A21855D-EBBF-41D2-B499-FC6E98C04E5B@???.???.??>
Content-Type: text/plain; charset=utf-8
Ubakusat starts transmiting 4 hours later
Rustem
Alfredos (fredy) Damkalis <fredy@?????.??> ?unlar? yazd? (11 May 2018 21:48):
> Following the latest ISS TLE it seems (need confirmation from the
> satellites teams) that:
>
> IRAZU is alive and transmit FSK9k6 [1]
>
> UBAKUSAT not heard yet [2] but the only observation until now was
> probably too close to deployment.
>
> 1KUNS seems to be alive but it doesn't seem to transmit FSK9k6 [3][4]
> except if this is a drifted signal from UBAKUSAT that should transmit
> +25KHz from the observed frequency.
>
> I guess soon we will need new tle, please share any news/updates.
>
> Thank you,
> fredy
>
> [1] https://network.satnogs.org/observations/133122/
> [2]
>
https://network.satnogs.org/observations/?future=1&good=1&bad=1&unvetted=1&fai
led=1&norad=99998&observer=&station=
> [3] https://network.satnogs.org/observations/133268/
> [4] https://network.satnogs.org/observations/133269/
>
>> On 05/11/2018 09:31 AM, Alfredos (fredy) Damkalis wrote:
>> Thanks for the info!
>>
>> Adding some details and one question.
>>
>> IRAZU telemetry is FSK9k6 at 436.500 MHz source: [1]
>> UBAKUSAT telemetry is GMSK9k6 at 437.325 MHz source: [2]
>> 1KUNS-PF telemetry is FSK9k6 at 437.300 MHz source: [3]
>>
>> The question is about UBAKUSAT, in some sites like IARU's one [4] refers
>> that CW is at 427.225 MHz, while in other sites like amsat-uk's one [5]
>> refers it at 437.225. Any idea which is the right one?
>>
>> 73,
>> fredy
>>
>> [1] https://directory.eoportal.org/web/eoportal/satellite-missions/i/irazu
>> [2]
>>
http://www.tamsat.org.tr/tr/ubakusat-amator-radyo-telemetri-ve-transponder-bil
gileri/
>> [3]
>>
http://engineering.uonbi.ac.ke/sites/default/files/cae/engineering/engineering
/1KUNS-PF_Cubesat_1.0_rev3.pdf
>> [4] http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=526
>> [5]
>> https://amsat-uk.org/2018/05/10/linear-transponder-cubesat-iss-deployment/
>>
>>> On 05/10/2018 08:26 PM, Masahiro Arai wrote:
>>> JAXA announced three CubeSats will deploy from ISS at 1030-1040z 11th
>>> May.
>>> The live broadcast will start at 1900z on YouTube.
>>> https://www.youtube.com/watch?v=4wRQ1Nljuiw
>>>
>>>
>>> The satellites are Irazu(Costa Rica), 1KUNS-PF(Kenya) and UBAKUSAT
>>> (Turk).
>>> IARU Amateur Satellite Frequency Coordination shows 1KUNS-PF and
>>> UBAKUSAT are operate on amateur radio band.
>>>
>>> 1KUNS-PF
>>> 3U CubeSat
>>> Digital downlink 9600bps 437.300 MHz
>>>
>>>
http://engineering.uonbi.ac.ke/sites/default/files/cae/engineering/engineering
/1KUNS-PF_Cubesat_1.0_rev3.pdf
>>>
>>>
>>> UBAKUSAT
>>> 3U CubeSat
>>> Beacon 427.225MHz
>>> TLM downlink 437.325MHz
>>> Linear Transponder downlink 435.200-435.250MHz
>>> uplink 145.940-145.990MHz
>>>
>>>
>>> JN1GKZ Masa Tokyo Japan
>>> _______________________________________________
>>> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
>>> to all interested persons worldwide without requiring membership.
>>> Opinions expressed
>>> are solely those of the author, and do not reflect the official views of
>>> AMSAT-NA.
>>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>>>
>> _______________________________________________
>> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
>> to all interested persons worldwide without requiring membership.
Opinions expressed
>> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 2
Date: Fri, 11 May 2018 16:41:08 +0200
From: "Vincenzo Mone" <vimone@?????.??>
To: "Amsat - BBs" <amsat-bb@?????.???>
Subject: [amsat-bb] StaPC Satellite list
Message-ID:
<!&!AAAAAAAAAAAYAAAAAAAAALgqrd2N1rRAiaQvRd7pgRDCgAAAEAAAAPvx8Pq2VzhCiymcLoyiXe
kBAAAAAA==@?????.??>
Content-Type: text/plain; charset="us-ascii"
Hi Folks,
I am going crazy to set the list of the satellites.
What I do is:
I go in the standard group and select the satellites for the Amateur.txt
click on OK
Re enter in the Satellite list and select Cubesat.txt.
I find already some satellites than I try to put other ones. click on OK
Re enter in the Satellite list and get back in the Amateur.txt list
And I can see that some satellites are disappeared from the selected list.
Is that normal?
How I have to do to select different satellites in each list?
Thanks
73's de Enzo IK8OZV
EasyLog 5 BetaTester
EasyLog PDA BetaTester
WinBollet BetaTester
D.C.I. CheckPoint Regione Campania
Skype: ik8ozv8520
*************************************
******* GSM +39 328 7110193 *******
****** SMS +39 328 7110193 ******
*************************************
------------------------------
Message: 3
Date: Fri, 11 May 2018 13:03:43 -0300
From: Pedro Converso <pconver@?????.???>
To: Vincenzo Mone <vimone@?????.??>
Cc: Amsat - BBs <amsat-bb@?????.???>
Subject: Re: [amsat-bb] StaPC Satellite list
Message-ID:
<CANTZqKnYnQ_mrf0ff639g1i02EXhe7P=OBopoSsaXC7ug0QF9w@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Hi Vincenzo,
On http://amsat.org.ar/keps.txt is a list of all available Satellites, you
can use or check.
It is updated 6 times a day and in use from http://amsat.org.ar/pass
73, LU7ABF, Pedro
On Fri, May 11, 2018 at 11:41 AM, Vincenzo Mone <vimone@?????.??> wrote:
> Hi Folks,
>
> I am going crazy to set the list of the satellites.
>
> What I do is:
>
> I go in the standard group and select the satellites for the Amateur.txt
> click on OK
>
> Re enter in the Satellite list and select Cubesat.txt.
>
> I find already some satellites than I try to put other ones. click on OK
>
> Re enter in the Satellite list and get back in the Amateur.txt list
>
> And I can see that some satellites are disappeared from the selected list.
>
> Is that normal?
>
> How I have to do to select different satellites in each list?
>
> Thanks
>
>
>
> 73's de Enzo IK8OZV
>
> EasyLog 5 BetaTester
>
> EasyLog PDA BetaTester
>
> WinBollet BetaTester
>
> D.C.I. CheckPoint Regione Campania
>
> Skype: ik8ozv8520
>
>
>
>
>
>
>
>
>
> *************************************
>
> ******* GSM +39 328 7110193 *******
>
> ****** SMS +39 328 7110193 ******
>
> *************************************
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 4
Date: Fri, 11 May 2018 18:32:50 +0200
From: Erich Eichmann <erich.eichmann@????????.??>
To: Vincenzo Mone <vimone@?????.??>, AMSAT-BB@?????.???
Subject: Re: [amsat-bb] StaPC Satellite list
Message-ID: <0b83ba78-c730-201d-2694-a3c73ee6575d@????????.??>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi Vincenzo,
when you selected the satellites for group? 'Standard' from amateur.txt
as source file click the OK button of menu 'Satellites'. That will save
the list and the name and path of amateur.txt for that group. At future
starts the program will track the same satellites using amateur.txt as
source file.
When you change the source file the program will only leave the
satellites in the list for which also the new source file contains data.
If you click OK the program will save the new list and the new source
file name.
To configure another group open the groups window (click on the empty
area of the main window right or left of the frequency window) and
double click on the name of the? group you want to track or to
configure, say Cubesat. The program will now track group Cubesat. Open
menu 'Satellites', choose a source file - say cubesat.txt - and select
the satellites you want to add to that group. Then click OK? to save the
cubesat list and name and path of file cubesat.txt.
Do the same with the other groups.
To have an overview over the satellites contained in the chosen group
leave the Countdown window constantly open.
73s, Erich, DK1TB
Am 11.05.2018 um 16:41 schrieb Vincenzo Mone:
> Hi Folks,
>
> I am going crazy to set the list of the satellites.
>
> What I do is:
>
> I go in the standard group and select the satellites for the Amateur.txt
> click on OK
>
> Re enter in the Satellite list and select Cubesat.txt.
>
> I find already some satellites than I try to put other ones. click on OK
>
> Re enter in the Satellite list and get back in the Amateur.txt list
>
> And I can see that some satellites are disappeared from the selected list.
>
> Is that normal?
>
> How I have to do to select different satellites in each list?
>
> Thanks
>
>
>
> 73's de Enzo IK8OZV
>
> EasyLog 5 BetaTester
>
> EasyLog PDA BetaTester
>
> WinBollet BetaTester
>
> D.C.I. CheckPoint Regione Campania
>
> Skype: ik8ozv8520
>
>
>
>
>
>
>
>
>
> *************************************
>
> ******* GSM +39 328 7110193 *******
>
> ****** SMS +39 328 7110193 ******
>
> *************************************
>
>
>
> _______________________________________________
> Sent viaAMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings:http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 5
Date: Fri, 11 May 2018 16:24:32 +0000 (UTC)
From: Scott Harvey <ka7fvv@?????.???>
To: amsat-bb@?????.???? "Alfredos (fredy) Damkalis" <fredy@?????.??>
Subject: Re: [amsat-bb] Three CubeSats deploy from ISS 1030z 11th May
Message-ID: <1865145620.217137.1526055872940@????.?????.???>
Content-Type: text/plain; charset=UTF-8
I noticed that as well.? I think it was probably a typo.? I am pretty sure
it is 435.225 but will need to monitor both frequencies after deployment.??
73, Scott, KA7FVV
President - KBARA ?
www.kbara.org
Co-Owner WA7DRE 443.525 System Fusion Repeater
Co-Owner KA7FVV 147.320 KBARA Repeater
http://www.ka7fvv.net
On Thursday, May 10, 2018, 11:57:12 PM PDT, Alfredos (fredy) Damkalis
<fredy@?????.??> wrote:
Thanks for the info!
Adding some details and one question.
IRAZU telemetry is FSK9k6 at 436.500 MHz source: [1]
UBAKUSAT telemetry is GMSK9k6 at 437.325 MHz source: [2]
1KUNS-PF telemetry is FSK9k6 at 437.300 MHz source: [3]
The question is about UBAKUSAT, in some sites like IARU's one [4] refers
that CW is at 427.225 MHz, while in other sites like amsat-uk's one [5]
refers it at 437.225. Any idea which is the right one?
73,
fredy
[1] https://directory.eoportal.org/web/eoportal/satellite-missions/i/irazu
[2]
http://www.tamsat.org.tr/tr/ubakusat-amator-radyo-telemetri-ve-transponder-bil
gileri/
[3]
http://engineering.uonbi.ac.ke/sites/default/files/cae/engineering/engineering
/1KUNS-PF_Cubesat_1.0_rev3.pdf
[4] http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=526
[5]
https://amsat-uk.org/2018/05/10/linear-transponder-cubesat-iss-deployment/
On 05/10/2018 08:26 PM, Masahiro Arai wrote:
> JAXA announced three CubeSats will deploy from ISS at 1030-1040z 11th
> May.
> The live broadcast will start at 1900z on YouTube.
> https://www.youtube.com/watch?v=4wRQ1Nljuiw
>
>
> The satellites are Irazu(Costa Rica), 1KUNS-PF(Kenya) and UBAKUSAT
> (Turk).
> IARU Amateur Satellite Frequency Coordination shows 1KUNS-PF and
> UBAKUSAT are operate on amateur radio band.
>
> 1KUNS-PF
> ?3U CubeSat
> ?Digital downlink 9600bps 437.300 MHz
>
>
http://engineering.uonbi.ac.ke/sites/default/files/cae/engineering/engineering
/1KUNS-PF_Cubesat_1.0_rev3.pdf
>
>
> UBAKUSAT
> ?3U CubeSat
> ?Beacon 427.225MHz
> ?TLM downlink 437.325MHz
> ?Linear Transponder downlink 435.200-435.250MHz
> ??????????????????? uplink?? 145.940-145.990MHz
>
>
> JN1GKZ?? Masa? Tokyo Japan
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership.
> Opinions expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
_______________________________________________
Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Fri, 11 May 2018 18:17:01 +0100
From: Graham Shirville <graham@?????????.???>
To: AMSAT <amsat-bb@?????.???>, "funcube@???????????.??.???
<funcube@???????????.??.??>
Subject: [amsat-bb] FUNcube-1 mode change
Message-ID: <713ba636-e309-487c-59d9-b495c5d7b205@?????????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi All,
Just to report that AO73/FUNcube-1 is now in continuous Amateur mode
with the transponder on for the weekend.
73
Graham
------------------------------
Message: 7
Date: Fri, 11 May 2018 17:57:39 -0400
From: "Joe Fitzgerald" <jfitzgerald@????.???.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] NASA needs amateur help with IMAGE spacecraft
recovery
Message-ID: <60dbd80a2a115c10689ef2c7e330e215.squirrel@????.???.???>
Content-Type: text/plain;charset=iso-8859-1
The following was seen on the seesat-l mailing list. Drop me a note off
list for Scott's e-mail address.
73 de KM1P Joe
*******BEGIN FORWARDED MESSAGE*********
From: Scott Tilley via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 11 May 2018 08:49:49 -0700
Hi All
Earlier this week I again recovered IMAGE on S-band. The spacecraft
started a series of eclipses and the first one appeared to cause IMAGE
to reboot and start transmitting again. After the initial recovery in
January of this year IMAGE faded away in late February.
NASA is now trying to reestablish control of the spacecraft and has been
actively attempting with some success to have the spacecraft accept
commands over the last couple of days.
A number of phenomenon have been observed that has challenged the ground
controllers to understand what is going on with the spacecraft and they
have asked for amateurs to contribute s-band signal data particularly as
the spacecraft passes through eclipse.
If you have access to equipment and are suitability located to
contribute observations please contact me for more information and
support in sharing your observations with NASA.
Thanks,
Scott Tilley
------------------------------
Message: 8
Date: Sat, 12 May 2018 05:53:06 +0000
From: Jean-Pierre Godet <godetj@???????.??>
To: amsat-bb@?????.???
Subject: [amsat-bb] UBAKUSAT
Message-ID: <6fe90860-c5c1-c00a-e1c5-3fbe41ba2d0e@???????.??>
Content-Type: text/plain; charset=utf-8; format=flowed
Received around 0500 UTC orbit nr 12 (?) 437.325 MHz GMSK 9k6, a
frame about each minute. Nothing from IRAZU nor 1KUNS-PF till now.
At the same time, near IRAZU, was something, narrow, looking like
1K2, about 437.300.
Have a nice day !
Jean-Pierre F5YG
------------------------------
Message: 9
Date: Sat, 12 May 2018 02:57:06 -0400
From: Scott <scott23192@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] UBAKUSAT
Message-ID:
<CAJCSnOYD8JsmxruRArjUy-b=1=OEJwTj=Nt5kZo5HD2Xwh=9xg@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Hi Jean-Pierre!
I assume that's 1KUNS-PF on 437.300 but as many others are saying on
Twitter, the signal looks like 1k2 BPSK (USB).
However, as of the time I'm writing this, it doesn't look like it's
decoding for anyone, including myself. I even tried it with LSB "just in
case".
My packets were fairly strong and the 9k6 FSK signals from Irazu (436.500)
and UBAKUSAT (437.325) decoded just fine.
So, as for the transmissions on 437.300, if they are 1k2 BPSK then perhaps
there is some corruption. No doubt we'll learn more in coming days as the
signals are looked at by some in the community who have the knowledge to
dig deeper into the packets.
73!
-Scott, K4KDR
=======================
On Sat, May 12, 2018 at 1:53 AM, Jean-Pierre Godet <godetj@???????.??>
wrote:
> Received around 0500 UTC orbit nr 12 (?) 437.325 MHz GMSK 9k6, a frame
> about each minute. Nothing from IRAZU nor 1KUNS-PF till now.
> At the same time, near IRAZU, was something, narrow, looking like 1K2,
> about 437.300.
>
> Have a nice day !
>
> Jean-Pierre F5YG
------------------------------
Message: 10
Date: Sat, 12 May 2018 11:02:35 -0600
From: Ron VE8RT <ve8rt@?????.??>
To: amsat-bb@?????.???
Subject: [amsat-bb] when are TLE's too old to use?
Message-ID: <20180512110235.2593fd47fbbe73cfc40de16a@?????.??>
Content-Type: text/plain; charset=US-ASCII
I understand that there won't be a good answer for how old can TLE's be
before they're of no use. If you were going to be offline for an
extended period, roughly, for a LEO, how long would you go before
they're worthless?
Ron VE8RT
--
Ron VE8RT <ve8rt@?????.??>
------------------------------
Message: 11
Date: Sat, 12 May 2018 14:34:41 -0400
From: "Andrew Glasbrenner" <glasbrenner@??????????.???>
To: "'Ron VE8RT'" <ve8rt@?????.??>, <amsat-bb@?????.???>
Subject: Re: [amsat-bb] when are TLE's too old to use?
Message-ID: <005d01d3ea1f$e476c0f0$ad6442d0$@??????????.???>
Content-Type: text/plain; charset="us-ascii"
For everything other than the ISS and lower, weeks. For sats in 600km and
higher, probably months if you are manual tuning and pointing.
YMMV.
73, Drew KO4MA
-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Ron VE8RT
Sent: Saturday, May 12, 2018 1:03 PM
To: amsat-bb@?????.???
Subject: [amsat-bb] when are TLE's too old to use?
I understand that there won't be a good answer for how old can TLE's be
before they're of no use. If you were going to be offline for an extended
period, roughly, for a LEO, how long would you go before they're worthless?
Ron VE8RT
--
Ron VE8RT <ve8rt@?????.??>
_______________________________________________
Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 12
Date: Sat, 12 May 2018 20:50:45 +0200
From: Armand SP3QFE <kontakt@??????.???>
To: Andrew Glasbrenner <glasbrenner@??????????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] when are TLE's too old to use?
Message-ID: <aea1a347faa57785c795a0630151ebdf@??????.???>
Content-Type: text/plain; charset=US-ASCII; format=flowed
Hello Everyone,
By the way...
How to get the TLE from the past? eg. to check something form the past
for some date in the past... such as 30 Apr. 2012?
73, Armand SP3QFE
On 2018-05-12 20:34, Andrew Glasbrenner wrote:
> For everything other than the ISS and lower, weeks. For sats in 600km
> and
> higher, probably months if you are manual tuning and pointing.
>
> YMMV.
>
> 73, Drew KO4MA
>
> -----Original Message-----
> From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Ron VE8RT
> Sent: Saturday, May 12, 2018 1:03 PM
> To: amsat-bb@?????.???
> Subject: [amsat-bb] when are TLE's too old to use?
>
> I understand that there won't be a good answer for how old can TLE's be
> before they're of no use. If you were going to be offline for an
> extended
> period, roughly, for a LEO, how long would you go before they're
> worthless?
>
> Ron VE8RT
>
> --
> Ron VE8RT <ve8rt@?????.??>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all
> interested persons worldwide without requiring membership. Opinions
> expressed are solely those of the author, and do not reflect the
> official
> views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership.
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Message: 13
Date: Sat, 12 May 2018 13:28:49 -0500
From: "Mark D. Johns" <mjohns+K0JM@??????.???>
To: Ron VE8RT <ve8rt@?????.??>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] when are TLE's too old to use?
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<CAHKCqnCoAj8bsOXSobuqV3raAw4Hwiup+NDeVRLB4V2Vhdwz0g@????.?????.???>
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Depends on what your margin for error is. In other words, define
"worthless."
In general, I update keps weekly. But for most LEOs and casual ham
operation, you could probably go 90 days or more and still find most birds
with your Arrow and handheld within a few minutes.
For ISS or other spacecraft with the ability to adjust the orbit with
thrusters, etc., you'd only be good until the next orbit boost.
--
Mark D. Johns
K?JM / M?GZO / ex-9H3DJ / ex-K?MDJ
Brooklyn Park, MN USA EN35hd
-----------------------------------------------
"Heaven goes by favor; if it went by merit,
you would stay out and your dog would go in."
---Mark Twain
On Sat, May 12, 2018 at 12:02 PM, Ron VE8RT <ve8rt@?????.??> wrote:
> I understand that there won't be a good answer for how old can TLE's be
> before they're of no use. If you were going to be offline for an
> extended period, roughly, for a LEO, how long would you go before
> they're worthless?
>
> Ron VE8RT
>
> --
> Ron VE8RT <ve8rt@?????.??>
> _______________________________________________
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End of AMSAT-BB Digest, Vol 13, Issue 162
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