RE: [multipsk] Multipsk 4.31 Satellite tracking question (Orbcomm)


Feb 19, 2016

 


----------------------------

#21598 Feb 19, 2016

Hi all,  Could someone tell me how often one should download the TLE data to keep it up-to-date?I guess that in the case where Orbcomm is changing the position of satellites it is obvious you need the latest ones.But if the satellite is stable, how often do you need to download the actual TLE?  The reason why I ask is that using the “Downloading” button you get all relevant (in this case Orbcomm) satellites.But at this moment not all satellites in this TLE are active.That becomes a problem as soon as a not active and an active satellite are visible at almost the same time, because MultiPSK will switch tot he one that is closes to you. I have seen examples where MultiPSK was nicely decoding a sattelite and suddenly switched to a not active one while the active one was still very strong.This can be avoided by deleting the not active satellites from the downloaded TLE.  PSAnd while on the subject of TLE data I wonder i fit is possible to ‘build’ your own TLE using the information in the “Ephemeris packet” messsages? If you have enough Altitude, Speed and Position values you could calculate the orbit, or not?? 19/02/16 12:17:26> Ephemeris packet -> Spacecraft Identifier: FM30 / The 19/02/16 at 12:17:27 UTC / Altitude: 782.3 km / Speed: 7.10 km/s / Position: 44.347°N 013.308°E (1294 Km Az=145° El=31°)    73,Dick  



----------------------------

#21601 Feb 19, 2016

Easy answer .. it depends



If there is a new launch (say some new cubestas deployed from iss ... then

sometimes I download new tle after a few hours ...



Sometimes you can live with old data ... but best is to use as actual data

as possible



Greetz



Sigi



Dg9bfc



> -----Urspr.ngliche Nachricht-----

> Von: multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com]

> Gesendet: Freitag, 19. Februar 2016 16:07

> An: multipsk@yahoogroups.com

> Betreff: [multipsk] Multipsk 4.31 Satellite tracking question (Orbcomm)

>

>

>

> Hi all,

>

>

>

> Could someone tell me how often one should download the TLE data to keep

> it up-to-date?

>

> I guess that in the case where Orbcomm is changing the position of

> satellites it is obvious you need the latest ones.

>

> But if the satellite is stable, how often do you need to download the

> actual TLE?

>

>

>

> The reason why I ask is that using the .Downloading. button you get all

> relevant (in this case Orbcomm) satellites.

> But at this moment not all satellites in this TLE are active.

> That becomes a problem as soon as a not active and an active satellite are

> visible at almost the same time, because MultiPSK will switch tot he one

> that is closes to you.

> I have seen examples where MultiPSK was nicely decoding a sattelite and

> suddenly switched to a not active one while the active one was still very

> strong.

>

> This can be avoided by deleting the not active satellites from the

> downloaded TLE.

>

>

>

> PS

>

> And while on the subject of TLE data I wonder i fit is possible to .build.

> your own TLE using the information in the .Ephemeris packet. messsages?

> If you have enough Altitude, Speed and Position values you could calculate

> the orbit, or not??

> 19/02/16 12:17:26> Ephemeris packet -> Spacecraft Identifier: FM30 / The

> 19/02/16 at 12:17:27 UTC / Altitude: 782.3 km / Speed: 7.10 km/s /

> Position: 44.347.N 013.308.E (1294 Km Az=145. El=31.)

>

>

>

>

>

> 73,

>

> Dick

>

>

>

>



----------------------------

#21603 Feb 19, 2016

HI Dick & all around !

Dick .. At the moment, and just on my case, found the most reliable .TLE data comes from ORBCOMM site direct because there is the list of (I think...) all active sats. Otherwhise sometimes the closest to you aren't transmitting .. So you can select the option "track only one sat." and follow the one which are you receiving 'till it's on your range. Here I'm doing that but I could be wrong.

www.orbcomm.com/en/network-data

73 de Txema - EA2AFR



----------------------------

#21607 Feb 19, 2016

Dick,  In the program, I display a message if one data i solder than 10 days. However I have not calculated the error. It’s an hypothesis. However, with a daily downloading, the error must be very low.  >This can be avoided by deleting the not active satellites from the downloaded TLE. All these satellites are supposed inactive and (normally) are not considered:IF (NOM='FM01') OR (NOM='FM02') OR (NOM='FM03') OR (NOM='FM17') OR (NOM='FM22') OR (NOM='FM24') OR ...(NOM='FM25').. OR (NOM='FM26') OR (NOM='FM28') OR (NOM='FM29') OR (NOM='FM37') OR (NOM='FM38') OR (NOM='FM39') OR (NOM='FM40'). OR (NOM='FM41') OR (NOM='FM111') THEN  >If you have enough Altitude, Speed and Position values you could calculate the orbit, or not?? With only one “Ephemeris packet”, it is not possible because you have not the displacement direction.With several “Ephemeris packet”, I suppose the orbit (at close time) could be evaluated, determining the displacement direction and the variation of altitude. I don’t think it would be very precise.  73Patrick  De : multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com] Envoy. : vendredi 19 f.vrier 2016 17:07. : multipsk@yahoogroups.comObjet : [multipsk] Multipsk 4.31 Satellite tracking question (Orbcomm)







----------------------------

#21610 Feb 19, 2016

Hello Txema and all,  The tracking is always done on the closest satellite, so the program can switch from one satellite to the following.Yes the only solution is to track only one satellite.  73Patrick  De : multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com] Envoy. : vendredi 19 f.vrier 2016 20:08. : multipsk@yahoogroups.comObjet : [multipsk] Re: Multipsk 4.31 Satellite tracking question (Orbcomm)



----------------------------

#21612 Feb 19, 2016

HI all around !

Wasn't my question but from Dick on msg. # 21598.That's reason why suggested him to use "track onlyone sat" which is what I do here avoiding the jump (when interested) on tracking a single one and MPSK jumps to the "closest".-

73 de Txema - EA2AFR



----------------------------

#21622 Feb 20, 2016

Hi all,





Could someone tell me how often one should download the TLE data to keep it

up-to-date?





I guess that in the case where Orbcomm is changing the position of

satellites it is obvious you need the latest ones.





But if the satellite is stable, how often do you need to download the actual

TLE?

[]

This can be avoided by deleting the not active satellites from the

downloaded TLE.

[]

73,

Dick

---------------





Dick,





For polar orbiters, if you only need 4/5 km position, probably once a week

is enough. If you need 1 km position, then 2-3 days.





To allow for Keplers being missed or updates not working, I would suggest an

automated update on a daily basis, as it's not too much traffic for a

limited number of satellites. I use my Kepler Manager for a daily automated

update (scheduled via the Windows Task Scheduler), but you might be able to

get away with a batch job running one or more instances of wget.





www.satsignal.eu/software/KeplerManager.htm





gnuwin32.sourceforge.net/packages/wget.htm





Cheers.

David

--

SatSignal Software - Quality software written to your requirements

Web: www.satsignal.eu

Email: david-taylor@...

Twitter: @gm8arv



----------------------------

#21623 Feb 20, 2016

Dick,

>For polar orbiters, if you only need 4/5 km position, probably once a week

>is enough. If you need 1 km position, then 2-3 days.

Without being very sure (as I have no absolute reference), I think the accuracy of the satellite position is about 10 km in longitude and latitude and 10 kms in altitude.



So I think an update each weak is sufficient.

>This can be avoided by deleting the not active satellites from the downloaded TLE.

All the "not active Orbcomm satellites" are ignored by the program.



73

Patrick





-----Message d'origine-----

De : multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com]

Envoy. : samedi 20 f.vrier 2016 11:11

. : multipsk@yahoogroups.com

Objet : Re: [multipsk] Multipsk 4.31 Satellite tracking question (Orbcomm)



Hi all,





Could someone tell me how often one should download the TLE data to keep it up-to-date?





I guess that in the case where Orbcomm is changing the position of

satellites it is obvious you need the latest ones.





But if the satellite is stable, how often do you need to download the actual

TLE?

[]

This can be avoided by deleting the not active satellites from the

downloaded TLE.

[]

73,

Dick

---------------





Dick,





For polar orbiters, if you only need 4/5 km position, probably once a week

is enough. If you need 1 km position, then 2-3 days.





To allow for Keplers being missed or updates not working, I would suggest an

automated update on a daily basis, as it's not too much traffic for a

limited number of satellites. I use my Kepler Manager for a daily automated

update (scheduled via the Windows Task Scheduler), but you might be able to

get away with a batch job running one or more instances of wget.





www.satsignal.eu/software/KeplerManager.htm





gnuwin32.sourceforge.net/packages/wget.htm





Cheers.

David

--

SatSignal Software - Quality software written to your requirements

Web: www.satsignal.eu

Email: david-taylor@...

Twitter: @gm8arv









---------------

Posted by: "David J Taylor" gm8arv@...>

---------------





---------------



Yahoo Groups Links



----------------------------

#21625 Feb 20, 2016

Hi Patrick,



You mention " All the "not active Orbcomm satellites" are ignored by the program."

What information do you use to determine that a satellite is not active?



If I look in " orbcomm.txt" I find

ORBCOMM FM24 [-]

If I look in "o16050.tle" from the Orbcomm site

there is no FM24

If I look in " SATELLITES_FREQUENCIES.TXT" is says:

FM24 137.2500 137.3125

But I do decode

20/02/16 05:48:30> Minor frame synchronisation -> Spacecraft Identifier: FM24 / Downlink channel number: 100 (137.2500 MHz) / Minor frame counter-Flag: 13-0



Which based on WXtrack using "o16050.tle" is from satellite K4 (FM104).



If I look in " orbcomm.txt" I find

ORBCOMM FM104 [+]

If I look in "o16050.tle" from the Orbcomm site I find

K4 (FM104)

If I look in " SATELLITES_FREQUENCIES.TXT" is says:

FM104 137.2500 137.3125



So I guess you use the [+] [-] indicators in the " orbcomm.txt" to determine which satellite ID is active.

Correct?





PS-1

This shows that satellite K4 (FM104) as Orbcomm mentions it in its "o16050.tle" is using ID FM24 in the messages.



PS-2

Now Orbcomm mentions on www.orbcomm.com/en/networks/satellite/orbcomm-og2

February 9, 2016

OG2 Update: All 11 Satellites Processing Customer Traffic, Being Positioned in Proper Orbits.



Would it not be better to use the TLE data from Orbcomm ("o16050.tle")?

I guess Orbcomm is the primary source of this TLE as they own these satellites..



73,

Dick



> -----Original Message-----

> From: multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com]

> Sent: Saturday, February 20, 2016 7:03 PM

> To: multipsk@yahoogroups.com

> Subject: RE: [multipsk] Multipsk 4.31 Satellite tracking question (Orbcomm)

>

> Dick,

>

> >For polar orbiters, if you only need 4/5 km position, probably once a

> >week is enough. If you need 1 km position, then 2-3 days.

> Without being very sure (as I have no absolute reference), I think the

> accuracy of the satellite position is about 10 km in longitude and latitude and

> 10 kms in altitude.

>

> So I think an update each weak is sufficient.

>

> >This can be avoided by deleting the not active satellites from the

> downloaded TLE.

> All the "not active Orbcomm satellites" are ignored by the program.

>

> 73

> Patrick

>

>

> -----Message d'origine-----

> De : multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com]

> Envoy. : samedi 20 f.vrier 2016 11:11 . : multipsk@yahoogroups.com Objet :

> Re: [multipsk] Multipsk 4.31 Satellite tracking question (Orbcomm)

>

> Hi all,

>

>

> Could someone tell me how often one should download the TLE data to keep

> it up-to-date?

>

>

> I guess that in the case where Orbcomm is changing the position of satellites

> it is obvious you need the latest ones.

>

>

> But if the satellite is stable, how often do you need to download the actual

> TLE?

> []

> This can be avoided by deleting the not active satellites from the

> downloaded TLE.

> []

> 73,

> Dick

---------------

>

>

> Dick,

>

>

> For polar orbiters, if you only need 4/5 km position, probably once a week

> is enough. If you need 1 km position, then 2-3 days.

>

>

> To allow for Keplers being missed or updates not working, I would suggest an

> automated update on a daily basis, as it's not too much traffic for a

> limited number of satellites. I use my Kepler Manager for a daily automated

> update (scheduled via the Windows Task Scheduler), but you might be able

> to

> get away with a batch job running one or more instances of wget.

>

>

> www.satsignal.eu/software/KeplerManager.htm

>

>

> gnuwin32.sourceforge.net/packages/wget.htm

>

>

> Cheers.

> David

> --

> SatSignal Software - Quality software written to your requirements

> Web: www.satsignal.eu

> Email: david-taylor@...

> Twitter: @gm8arv

>

>

>

>

---------------

> Posted by: "David J Taylor" gm8arv@...>

---------------

>

>

---------------

>

> Yahoo Groups Links

>

>

>

>

>

>

---------------

> Posted by: "Patrick Lindecker" f6cte@...>

---------------

>

>

---------------

>

> Yahoo Groups Links

>

>

>







----------------------------

#21626 Feb 20, 2016

HI Dick & all around !

I've suggested you on a previous message to use .TLE direct from ORBCOMM site .. That avoids the problem with the active/inactive satellites since there is (I think...) the only active ones. I don't know if you've read that message.

[Quoted from a previous msg]Dick .. At the moment, and just on my case, found the most reliable .TLE data comes from ORBCOMM site direct because there is the list of (I think...) all active sats. Otherwhise sometimes the closest to you aren't transmitting .. So you can select the option "track only one sat." and follow the one which are you receiving 'till it's on your range. Here I'm doing that but I could be wrong.

www.orbcomm.com/en/network-data

73 de Txema - EA2AFR[END]



----------------------------

#21627 Feb 20, 2016

Hi Txema,Yes I know, thank you.But MultiPSK is using the TLE ("orbcomm.txt" ) from Celestrak which is why I mentioned it.    I don.t use the "track only one sat." because that means I have to be watching it or I can monitor only one satellite. I prefer to let it run unattended (24/7) and see what I can learn from that..  73, Dick  From: multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com] Sent: Saturday, February 20, 2016 9:55 PMTo: multipsk@yahoogroups.comSubject: RE: [multipsk] Multipsk 4.31 Satellite tracking question (Orbcomm)



----------------------------

#21629 Feb 20, 2016

For tracking sats i use orbitron connected to hdsdr via dde link



Reason behind that is that in orbitron you can set an option that a new sat

sets new lo (and tune is set 12 kc away with a setting in hdsdr)



Then the tune stays locked while the sat is overhead ... and the lo changes

for Doppler correction



Does not work all times (cause you can have a new sat when the other is

still above you)



But it works in many cases (example you track just a few sats)



...



You can track just one ... or a list of sats



And you can work with any decoding software with that setup



(example decoding telemetry packets or similar things)



Greetz



Sigi



Dg9bfc





> -----Urspr.ngliche Nachricht-----

> Von: multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com]

> Gesendet: Samstag, 20. Februar 2016 22:45

> An: multipsk@yahoogroups.com

> Betreff: RE: [multipsk] Multipsk 4.31 Satellite tracking question

> (Orbcomm)

>

>

>

> Hi Txema,

>

> Yes I know, thank you.

>

> But MultiPSK is using the TLE ("orbcomm.txt" ) from Celestrak which is why

> I mentioned it.

>

>

>

>

>

> I don.t use the "track only one sat." because that means I have to be

> watching it or I can monitor only one satellite. I prefer to let it run

> unattended (24/7) and see what I can learn from that..

>

>

>

> 73, Dick

>

>

>

> From: multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com]

> Sent: Saturday, February 20, 2016 9:55 PM

> To: multipsk@yahoogroups.com

> Subject: RE: [multipsk] Multipsk 4.31 Satellite tracking question

> (Orbcomm)

>

>

>

>

>

> HI Dick & all around !

>

> I've suggested you on a previous message to use .TLE direct from

> ORBCOMM site .. That avoids the problem with the active/inactive

> satellites since there is (I think...) the only active ones. I don't

> know if you've read that message.

>

> [Quoted from a previous msg]

> Dick .. At the moment, and just on my case, found the most reliable

> .TLE data comes from ORBCOMM site direct because there is the list

> of (I think...) all active sats. Otherwhise sometimes the closest to

> you aren't transmitting .. So you can select the option "track only

> one sat." and follow the one which are you receiving 'till it's on your

> range. Here I'm doing that but I could be wrong.

>

> www.orbcomm.com/en/network-data

>

> 73 de Txema - EA2AFR

> [END]

>

>

>

>

>



----------------------------

#21630 Feb 20, 2016

HI Dick & all around !

Dick .. You can track only one if you want to see i.e. the max. distance you can get this one on range, avoiding in this case the "jump" to another one closest. MULTICOM uses Celestrak .TLE (automated for) or ORBCOMM .TLE in manual .. The advantage to use ORBCOMM .TLE is that there on the list is the active sats only.

73 de Txema - EA2AFR



----------------------------

#21632 Feb 21, 2016

Hello Txema,  You mentionMULTICOM uses Celestrak .TLE (automated for) or ORBCOMM .TLE in manual .Not sure about MULTICOM.. Do you mean MultiPSK?  I know that MultiPSK useswww.celestrak.com/NORAD/elements/orbcomm.txtBut I don.t understand what you mean withORBCOMM .TLE in manual  I could not find any info in the Help about .Manual. and. .ORBCOMM .TLE..  Can you explain how I can use the ORBCOMM .TLE .in MultiPSK?  73, Dick  



----------------------------

#21635 Feb 21, 2016

Hello again Dick !

Yes .. you're right and it was my mistake .. Wanted to say MULTIPSK and mixed it with ORBITRON hence MULTICOM HI HI.MULTIPSK goes direct to Celestrak site and download/install into the TLE_SATELLITES the file "orbcomm" but there is all them, actives and inactives marked (+) or (-). Problem is that MULTIPSK can't recognize the symbols (+)/(-) and assume ALL are actives. Otherwise you can go to ORBCOMM site and download the .TLE data which is actualized every day at:

www.orbcomm.com/en/network-data

Then you can copy the data and save it as "orbcomm.txt" into TLE_SATELLITES folder. before start MULTIPSK.

I'm sorry because my "Spanglish" isn't too good but I hope you can understand that.

73 de Txema - EA2AFR







----------------------------

#21636 Feb 21, 2016

In orbitron you also can download ALL sat data with just a mouse click (or

two)



(amateur.txt, orbcomm.txt, educational.txt ... and so on)



And that text files can be easy copied in the multipsk folder



.....



Dg9bfc



Sigi





> -----Urspr.ngliche Nachricht-----

> Von: multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com]

> Gesendet: Sonntag, 21. Februar 2016 16:07

> An: multipsk@yahoogroups.com

> Betreff: RE: [multipsk] Multipsk 4.31 Satellite tracking question

> (Orbcomm)

>

>

>

> Hello again Dick !

>

> Yes .. you're right and it was my mistake .. Wanted to say MULTIPSK and

> mixed it with ORBITRON hence MULTICOM HI HI.

> MULTIPSK goes direct to Celestrak site and download/install into the

> TLE_SATELLITES the file "orbcomm" but there is all them, actives and

> inactives marked (+) or (-). Problem is that MULTIPSK can't recognize

> the symbols (+)/(-) and assume ALL are actives. Otherwise you can go

> to ORBCOMM site and download the .TLE data which is actualized every

> day at:

>

> www.orbcomm.com/en/network-data

>

> Then you can copy the data and save it as "orbcomm.txt" into

> TLE_SATELLITES folder. before start MULTIPSK.

>

> I'm sorry because my "Spanglish" isn't too good but I hope you can

> understand that.

>

> 73 de Txema - EA2AFR

>

>

>

>



----------------------------

#21637 Feb 21, 2016

Hi Txema,

OK, now I understand what you mean. :-)

From Patrick I understood that only the active satellites are tracked when in auto mode.Not sure how MultiPSK determines which satellite is active and which is not.Maybe the (+) and (-) are used.Or maybe only satellites that are in SATELLITES_FREQUENCIES.TXT are tracked.

Actually that was what I was trying to ask in this post :

multipsk

multipsk Please note only would be subscribers that show either a callsign/swl number or show that they have a genuine interest in our hobby will be allowed t...



----------------------------

#21639 Feb 21, 2016

Dick,

>What information do you use to determine that a satellite is not active?

By default, all those satellites are ignored:

IF (NOM='FM01') OR (NOM='FM02') OR (NOM='FM03') OR (NOM='FM17') OR (NOM='FM22') OR (NOM='FM24') OR (NOM='FM25') OR (NOM='FM26') OR (NOM='FM28') OR (NOM='FM29') OR (NOM='FM37') OR (NOM='FM38') OR (NOM='FM39') OR (NOM='FM40') OR (NOM='FM41') OR (NOM='FM111') THEN

>So I guess you use the [+] [-] indicators in the " orbcomm.txt" to determine which >satellite ID is active.

On my local version (next test version), a satellite with the first line with "[-]" is also ignored.

>Would it not be better to use the TLE data from Orbcomm ("o16050.tle")?

Perhaps, but the data from Celestrac is updated very regularly and Multipsk does not need to be ultra-precise. Moreover the name on Celestrac is always the same whereas the one of Orbcomm changes each day which complicates a bit.



73

Patrick



-----Message d'origine-----

De : multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com]

Envoy. : samedi 20 f.vrier 2016 19:59

. : multipsk@yahoogroups.com

Objet : RE: [multipsk] Multipsk 4.31 Satellite tracking question (Orbcomm)



Hi Patrick,



You mention " All the "not active Orbcomm satellites" are ignored by the program."

What information do you use to determine that a satellite is not active?



If I look in " orbcomm.txt" I find

ORBCOMM FM24 [-]

If I look in "o16050.tle" from the Orbcomm site

there is no FM24

If I look in " SATELLITES_FREQUENCIES.TXT" is says:

FM24 137.2500 137.3125

But I do decode

20/02/16 05:48:30> Minor frame synchronisation -> Spacecraft Identifier: FM24 / Downlink channel number: 100 (137.2500 MHz) / Minor frame counter-Flag: 13-0



Which based on WXtrack using "o16050.tle" is from satellite K4 (FM104).



If I look in " orbcomm.txt" I find

ORBCOMM FM104 [+]

If I look in "o16050.tle" from the Orbcomm site I find

K4 (FM104)

If I look in " SATELLITES_FREQUENCIES.TXT" is says:

FM104 137.2500 137.3125



So I guess you use the [+] [-] indicators in the " orbcomm.txt" to determine which satellite ID is active.

Correct?





PS-1

This shows that satellite K4 (FM104) as Orbcomm mentions it in its "o16050.tle" is using ID FM24 in the messages.



PS-2

Now Orbcomm mentions on www.orbcomm.com/en/networks/satellite/orbcomm-og2

February 9, 2016

OG2 Update: All 11 Satellites Processing Customer Traffic, Being Positioned in Proper Orbits.



Would it not be better to use the TLE data from Orbcomm ("o16050.tle")?

I guess Orbcomm is the primary source of this TLE as they own these satellites..



73,

Dick



> -----Original Message-----

> From: multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com]

> Sent: Saturday, February 20, 2016 7:03 PM

> To: multipsk@yahoogroups.com

> Subject: RE: [multipsk] Multipsk 4.31 Satellite tracking question

> (Orbcomm)

>

> Dick,

>

> >For polar orbiters, if you only need 4/5 km position, probably once a

> >week is enough. If you need 1 km position, then 2-3 days.

> Without being very sure (as I have no absolute reference), I think the

> accuracy of the satellite position is about 10 km in longitude and

> latitude and

> 10 kms in altitude.

>

> So I think an update each weak is sufficient.

>

> >This can be avoided by deleting the not active satellites from the

> downloaded TLE.

> All the "not active Orbcomm satellites" are ignored by the program.

>

> 73

> Patrick

>

>

> -----Message d'origine-----

> De : multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com] Envoy.

> : samedi 20 f.vrier 2016 11:11 . : multipsk@yahoogroups.com Objet :

> Re: [multipsk] Multipsk 4.31 Satellite tracking question (Orbcomm)

>

> Hi all,

>

>

> Could someone tell me how often one should download the TLE data to

> keep it up-to-date?

>

>

> I guess that in the case where Orbcomm is changing the position of

> satellites it is obvious you need the latest ones.

>

>

> But if the satellite is stable, how often do you need to download the

> actual TLE?

> []

> This can be avoided by deleting the not active satellites from the

> downloaded TLE.

> []

> 73,

> Dick

---------------

>

>

> Dick,

>

>

> For polar orbiters, if you only need 4/5 km position, probably once a

> week is enough. If you need 1 km position, then 2-3 days.

>

>

> To allow for Keplers being missed or updates not working, I would

> suggest an automated update on a daily basis, as it's not too much

> traffic for a limited number of satellites. I use my Kepler Manager

> for a daily automated update (scheduled via the Windows Task

> Scheduler), but you might be able to get away with a batch job running

> one or more instances of wget.

>

>

> www.satsignal.eu/software/KeplerManager.htm

>

>

> gnuwin32.sourceforge.net/packages/wget.htm

>

>

> Cheers.

> David

> --

> SatSignal Software - Quality software written to your requirements

> Web: www.satsignal.eu

> Email: david-taylor@...

> Twitter: @gm8arv

>

>

>

>

---------------

> Posted by: "David J Taylor" gm8arv@...>

---------------

>

>

---------------

>

> Yahoo Groups Links

>

>

>

>

>

>

---------------

> Posted by: "Patrick Lindecker" f6cte@...>

---------------

>

>

---------------

>

> Yahoo Groups Links

>

>

>





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Posted by: "acarsd \(planet\)" acarsd@...>

---------------





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Yahoo Groups Links







----------------------------

#21643 Feb 21, 2016

Dick,  >Or maybe only satellites that are in SATELLITES_FREQUENCIES.TXT are tracked.These are only indications. Once the name of the satellite tracked known, it is searched the possible frequencies in the SATELLITES_FREQUENCIES.TXT file.  73Patrick

 De : multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com] Envoy. : dimanche 21 f.vrier 2016 17:44. : multipsk@yahoogroups.comObjet : RE: [multipsk] Multipsk 4.31 Satellite tracking question (Orbcomm)



----------------------------

#21644 Feb 21, 2016

Hello Patrick,

Thank you for explaining.



I wonder, would it not be easier and more dynamic to use the "SATELLITES_FREQUENCIES.TXT" to determine which satellite is active, instead of a hardcoded IF statement?

If a satellite is not in the " SATELLITES_FREQUENCIES.TXT" file then you don't have a frequency to tune to, so you could ignore this entry in the "orbcomm.txt" file.

Just a thought.. :-)



73, Dick





> -----Original Message-----

> From: multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com]

> Sent: Sunday, February 21, 2016 6:47 PM

> To: multipsk@yahoogroups.com

> Subject: RE: [multipsk] Multipsk 4.31 Satellite tracking question (Orbcomm)

>

> Dick,

>

> >What information do you use to determine that a satellite is not active?

> By default, all those satellites are ignored:

> IF (NOM='FM01') OR (NOM='FM02') OR (NOM='FM03') OR (NOM='FM17')

> OR (NOM='FM22') OR (NOM='FM24') OR (NOM='FM25') OR (NOM='FM26')

> OR (NOM='FM28') OR (NOM='FM29') OR (NOM='FM37') OR (NOM='FM38')

> OR (NOM='FM39') OR (NOM='FM40') OR (NOM='FM41') OR (NOM='FM111')

> THEN

>

> >So I guess you use the [+] [-] indicators in the " orbcomm.txt" to determine

> which >satellite ID is active.

> On my local version (next test version), a satellite with the first line with "[-]"

> is also ignored.

>

> >Would it not be better to use the TLE data from Orbcomm ("o16050.tle")?

> Perhaps, but the data from Celestrac is updated very regularly and Multipsk

> does not need to be ultra-precise. Moreover the name on Celestrac is always

> the same whereas the one of Orbcomm changes each day which complicates

> a bit.

>

> 73

> Patrick

>


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