Have the last days qso s made via AO-73 sat the rx goes from s 9 to 0 sometimes with a lot of QRM. I think the sat turned around its axis faster than a few months ago. Many stations have problems with QSO S via this sat. 73 PE1NIL
Agreed, severe QSB even with RHC rx antenna. Also, I'm not rx anywhere near the number of TLM frames since the xponder was turned on.
Hasan
On Mon, Dec 17, 2018 at 7:19 AM Cor van Heiningen < [email protected]> wrote:
Have the last days qso s made via AO-73 sat the rx goes from s 9 to 0 sometimes with a lot of QRM. I think the sat turned around its axis faster than a few months ago. Many stations have problems with QSO S via this sat. 73 PE1NIL _______________________________________________ Sent via [email protected]. 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
Suspect you're receiving less TLM frames as the beacon is using less power think about 30mW rather than the 400mW you was seeing before this is because the transponder is getting most of the power budget.
Good time to see if you can improve your RX setup for the weaker signal :)
Peter 2M0SQL
On Mon, 17 Dec 2018 at 16:36, Hasan al-Basri [email protected] wrote:
Agreed, severe QSB even with RHC rx antenna. Also, I'm not rx anywhere near the number of TLM frames since the xponder was turned on.
Hasan
On Mon, Dec 17, 2018 at 7:19 AM Cor van Heiningen < [email protected]> wrote:
Have the last days qso s made via AO-73 sat the rx goes from s 9 to 0 sometimes with a lot of QRM. I think the sat turned around its axis faster than a few months ago. Many stations have problems with QSO S via this sat. 73 PE1NIL _______________________________________________ Sent via [email protected]. 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 [email protected]. 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
Dear All,
Also noticed quite a difference on AO-73 reception this side, it used to be 100% reliable but less decodes theses day, I have not investigate same but for sure there is a degradation somehow.
Just FYI
73
Jean Marc (3B8DU)
On Dec 17, 2018, at 8:35 PM, Hasan al-Basri [email protected] wrote:
Agreed, severe QSB even with RHC rx antenna. Also, I'm not rx anywhere near the number of TLM frames since the xponder was turned on.
Hasan
On Mon, Dec 17, 2018 at 7:19 AM Cor van Heiningen < [email protected]> wrote:
Have the last days qso s made via AO-73 sat the rx goes from s 9 to 0 sometimes with a lot of QRM. I think the sat turned around its axis faster than a few months ago. Many stations have problems with QSO S via this sat. 73 PE1NIL _______________________________________________ Sent via [email protected]. 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 [email protected]. 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
Some personal thoughts on this subject. On the 14th December AO-73 was placed back in Transponder mode after having been in Educational Mode for many months to examine the performance of AO-73 in full sun. AO-73 is currently experiencing its second full sun encounter which will last until April 2019. The first experience was earlier this year when a number of observations were noted in AO-73's attitude. A controlled experiment has been undertaken during the first stage of this current full sun encounter to understand and quantify those previous observations.
Simply put, while in full sun AO-73 slowly speeds up due to Propeller Effect and reaches a point where due to an offset Centre of Gravity the Nutation becomes excessive and AO-73 finally ceases to rotate about its Z-Z axis.
Points of clarification. Educational Mode 300 milli-watts Beacon downlink. Transponder Mode 30 milli-watt Beacon. Propeller Effect occurs from the Materials Experiment on AO-73. Schools STEM Initiative. https://funcube.org.uk/education-outreach/ The fading you are currently seeing is medium to high Nutation (Wobble about the Z-Z axis). AO-73 has not ceased to rotate about the Z-Z axis or start tumbling. For past history please refer to Mike's Blog and in particular. http://www.dk3wn.info/p/?cat=79
73 Colin VK5HI
-----Original Message----- From: AMSAT-BB [mailto:[email protected]] On Behalf Of Jean Marc Momple Sent: Tuesday, 18 December 2018 04:15 To: Hasan al-Basri Cc: [email protected]; [email protected] Subject: Re: [amsat-bb] A0-73
Dear All,
Also noticed quite a difference on AO-73 reception this side, it used to be 100% reliable but less decodes theses day, I have not investigate same but for sure there is a degradation somehow.
Just FYI
73
Jean Marc (3B8DU)
On Dec 17, 2018, at 8:35 PM, Hasan al-Basri [email protected]
wrote:
Agreed, severe QSB even with RHC rx antenna. Also, I'm not rx anywhere near the number of TLM frames since the xponder was turned on.
Hasan
On Mon, Dec 17, 2018 at 7:19 AM Cor van Heiningen < [email protected]> wrote:
Have the last days qso s made via AO-73 sat the rx goes from s 9 to 0 sometimes with a lot of QRM. I think the sat turned around its axis faster than a few months ago. Many stations have problems with QSO S via this sat. 73 PE1NIL
First of all I would like to thank Colin for his many hours of work analyzing the behaviour of AO-73. Keep in mind that FUNcube uses passive stabilization and that the team can not influence the attitude and spin rate of the satellite.
We have done some experiments, like Colin already mentioned, and at the moment the satellite is placed in to full time transponder mode for the holidays. So expect the transponder to be on and the telemetry to be 30mW.
73
Wouter PA3WEG FUNcube team
On Mon, Dec 17, 2018 at 11:38 PM Colin Hurst [email protected] wrote:
Some personal thoughts on this subject. On the 14th December AO-73 was placed back in Transponder mode after having been in Educational Mode for many months to examine the performance of AO-73 in full sun. AO-73 is currently experiencing its second full sun encounter which will last until April 2019. The first experience was earlier this year when a number of observations were noted in AO-73's attitude. A controlled experiment has been undertaken during the first stage of this current full sun encounter to understand and quantify those previous observations.
Simply put, while in full sun AO-73 slowly speeds up due to Propeller Effect and reaches a point where due to an offset Centre of Gravity the Nutation becomes excessive and AO-73 finally ceases to rotate about its Z-Z axis.
Points of clarification. Educational Mode 300 milli-watts Beacon downlink. Transponder Mode 30 milli-watt Beacon. Propeller Effect occurs from the Materials Experiment on AO-73. Schools STEM Initiative. https://funcube.org.uk/education-outreach/ The fading you are currently seeing is medium to high Nutation (Wobble about the Z-Z axis). AO-73 has not ceased to rotate about the Z-Z axis or start tumbling. For past history please refer to Mike's Blog and in particular. http://www.dk3wn.info/p/?cat=79
73 Colin VK5HI
-----Original Message----- From: AMSAT-BB [mailto:[email protected]] On Behalf Of Jean Marc Momple Sent: Tuesday, 18 December 2018 04:15 To: Hasan al-Basri Cc: [email protected]; [email protected] Subject: Re: [amsat-bb] A0-73
Dear All,
Also noticed quite a difference on AO-73 reception this side, it used to be 100% reliable but less decodes theses day, I have not investigate same but for sure there is a degradation somehow.
Just FYI
73
Jean Marc (3B8DU)
On Dec 17, 2018, at 8:35 PM, Hasan al-Basri [email protected]
wrote:
Agreed, severe QSB even with RHC rx antenna. Also, I'm not rx anywhere near the number of TLM frames since the xponder was turned on.
Hasan
On Mon, Dec 17, 2018 at 7:19 AM Cor van Heiningen < [email protected]> wrote:
Have the last days qso s made via AO-73 sat the rx goes from s 9 to 0 sometimes with a lot of QRM. I think the sat turned around its axis faster than a few months ago. Many stations have problems with QSO S via this sat. 73 PE1NIL
Sent via [email protected]. 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
Noticed with AO-73 that it seems to be fading faster and having to use the polarisation switch a bit more.
I've also noticed that on EO-88 and AO-73 a few seem to be using a bit too much power on CW and it's using up quite a bit of the power budget.
Peter, 2M0SQL
On Mon, 17 Dec 2018 at 13:19, Cor van Heiningen [email protected] wrote:
Have the last days qso s made via AO-73 sat the rx goes from s 9 to 0 sometimes with a lot of QRM. I think the sat turned around its axis faster than a few months ago. Many stations have problems with QSO S via this sat. 73 PE1NIL _______________________________________________ Sent via [email protected]. 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
participants (6)
-
Colin Hurst -
Cor van Heiningen -
Hasan al-Basri -
Jean Marc Momple -
Peter Goodhall (2M0SQL) -
Wouter Weggelaar