Thank you for TLE update 
.Beacon signal of Connecta T1.2 is silenced for 12 hours on purpose. It is part of our LEOP Phase. If you cannot see our signal until 19.00 UTC, you do not need to worry. Your SATNOGS station is OK.
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Per request, I’ve updated the TLE of “EPIC CHIMERA LEO 1” to:
1 88310U 23005.58241233 +.00008746 +00000+0 +51053-3 0 0002
2 88310 97.5034 67.6665 0010472 213.2239 146.8336 15.12121087 00045
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FYI, that last TLE estimate for BDSAT-2 was still pretty accurate as of 0200 utc on 10-Jan-2023.
I was trying the 70cm 9k6 APRS digipeater with no luck, but SP5LOT had already found success, so his call is listed in the telemetry. Will keep trying!
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Hello,
just to be clear. BDSat-2 do not use APRS. It uses AX.25 with G3RUH scrambling.
Digipeater on BDSat-2 is always active both on 70cm and 2m bands. However the TRX module on the satellite has to be in RX mode so digipeater on 70cm is unavailable while the TRX is transmitting.
Satellite accepts and resends all packets with OK0BDT calssign and dest. SSID 0.
Example of acceptable AX25 packet:
0x9E 0x96 0x60 0x84 0x88 0xA8 0xE0 0x9E 0x9A 0x66 0x96 0xA6 0x92 0x61 0x03 0xF0 0x55 0x48 0x46 0x20 0x64 0x69 0x67 0x69 0x70 0x65 0x61 0x74 0x65 0x72 0x20 0x74 0x65 0x73 0x74 0x20 0x3A 0x29
Satellite then resends OM3KSI to CQ via OK0BDT.
73!
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New TLE sets by @michal.drzal for ION SCV-007 and ION SCV-008:
ION SCV-007
1 99216U 23010.90000000 .00000000 00000-0 00000-0 0 05
2 99216 97.5056 73.1956 0009101 304.4887 202.7834 15.13850659 06
ION SCV-008
1 99217U 23010.90000000 .00000000 00000-0 00000-0 0 06
2 99217 97.5062 72.8028 0008174 325.1610 177.4071 15.13624491 07
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New TLE set for Connecta T1.2:
Connecta T1.2
1 99287U 23012.50000000 .00000000 00000-0 00000-0 0 01
2 99287 97.5114 75.3974 0011673 182.9161 5.6275 15.12018449 05
And by @EelkeVisser for BDSAT-2
BDSAT-2
1 99244U 23013.55414352 .00000000 00000-0 59066-3 0 08
2 99244 97.5105 75.5180 0017154 172.9905 49.0640 15.13750062 07
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I guess we knew that it would take a while to any official TLEs to show up. But finally, they’re here.
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The TLE sets from spacetrack are still in TBA status and there are ~52 missing ones, so we will need to wait for any identification:
0 TBA - TO BE ASSIGNED
1 55009U 23001A 23013.72427210 .00007052 00000-0 41606-3 0 9993
2 55009 97.5011 75.6589 0010034 191.1692 168.9317 15.11811239 1683
0 TBA - TO BE ASSIGNED
1 55010U 23001B 23013.72381457 .00011890 00000-0 69626-3 0 9994
2 55010 97.5033 75.6628 0010462 193.0060 167.0902 15.11922147 1689
0 TBA - TO BE ASSIGNED
1 55011U 23001C 23013.72355906 .00011358 00000-0 66473-3 0 9991
2 55011 97.5059 75.6667 0010945 194.3032 165.7890 15.11950659 1680
0 TBA - TO BE ASSIGNED
1 55012U 23001D 23013.72276601 .00008764 00000-0 51238-3 0 9996
2 55012 97.5082 75.6707 0011694 193.3762 166.7161 15.12052848 1689
0 TBA - TO BE ASSIGNED
1 55013U 23001E 23013.72212230 .00015254 00000-0 88456-3 0 9999
2 55013 97.4993 75.6580 0010314 181.4423 178.6780 15.12218413 1680
0 TBA - TO BE ASSIGNED
1 55014U 23001F 23013.72191943 .00015843 00000-0 91766-3 0 9999
2 55014 97.5032 75.6651 0011147 189.0553 171.0478 15.12242907 1684
0 TBA - TO BE ASSIGNED
1 55015U 23001G 23013.72181543 .00010786 00000-0 62681-3 0 9990
2 55015 97.5067 75.6706 0011604 189.2617 170.8402 15.12211627 1684
0 TBA - TO BE ASSIGNED
1 55016U 23001H 23013.72195987 .00006937 00000-0 40530-3 0 9990
2 55016 97.4998 75.6605 0011305 186.8232 173.2847 15.12158008 1682
0 TBA - TO BE ASSIGNED
1 55017U 23001J 23013.72139703 .00014513 00000-0 83944-3 0 9990
2 55017 97.4978 75.6578 0010835 183.7869 176.3282 15.12316572 1688
0 TBA - TO BE ASSIGNED
1 55018U 23001K 23013.72135607 .00013777 00000-0 79725-3 0 9993
2 55018 97.5016 75.6632 0011111 183.6930 176.4220 15.12308013 1684
0 TBA - TO BE ASSIGNED
1 55019U 23001L 23013.72131818 .00013825 00000-0 79982-3 0 9993
2 55019 97.5044 75.6678 0011387 186.4317 173.6769 15.12314704 1682
0 TBA - TO BE ASSIGNED
1 55020U 23001M 23013.72106131 .00010687 00000-0 61904-3 0 9993
2 55020 97.5015 75.6634 0011368 181.4467 178.6732 15.12336645 1687
0 TBA - TO BE ASSIGNED
1 55021U 23001N 23013.72107453 .00007944 00000-0 46169-3 0 9990
2 55021 97.5013 75.6622 0011486 177.6425 182.4862 15.12302574 1686
0 TBA - TO BE ASSIGNED
1 55022U 23001P 23013.32368084 .00007927 00000-0 45911-3 0 9991
2 55022 97.5015 75.2729 0011662 176.2915 183.8404 15.12423297 1625
0 TBA - TO BE ASSIGNED
1 55023U 23001Q 23013.32396595 .00006996 00000-0 40701-3 0 9997
2 55023 97.5045 75.2796 0011456 180.1259 179.9971 15.12310051 1627
0 TBA - TO BE ASSIGNED
1 55024U 23001R 23013.32365307 .00010850 00000-0 62676-3 0 9994
2 55024 97.5036 75.2774 0011546 185.1837 174.9276 15.12428270 1627
0 TBA - TO BE ASSIGNED
1 55025U 23001S 23013.32340469 .00007397 00000-0 42846-3 0 9996
2 55025 97.5047 75.2800 0011732 183.1510 176.9649 15.12442494 1623
0 TBA - TO BE ASSIGNED
1 55026U 23001T 23013.32350683 .00008962 00000-0 51876-3 0 9998
2 55026 97.5009 75.2709 0012216 175.4653 184.6690 15.12399952 1622
0 TBA - TO BE ASSIGNED
1 55027U 23001U 23013.32338481 .00007502 00000-0 43498-3 0 9991
2 55027 97.5004 75.2721 0011699 181.3704 178.7497 15.12404182 1620
0 TBA - TO BE ASSIGNED
1 55028U 23001V 23013.32312612 .00009536 00000-0 55054-3 0 9990
2 55028 97.5019 75.2728 0012575 174.6404 185.4964 15.12473019 1629
0 TBA - TO BE ASSIGNED
1 55029U 23001W 23013.32329547 .00009742 00000-0 56326-3 0 9998
2 55029 97.5043 75.2816 0011936 179.2615 180.8635 15.12419978 1628
0 TBA - TO BE ASSIGNED
1 55030U 23001X 23013.32315963 .00008745 00000-0 50559-3 0 9991
2 55030 97.5005 75.2717 0012071 178.4367 181.6903 15.12453428 1629
0 TBA - TO BE ASSIGNED
1 55031U 23001Y 23013.32312062 .00009590 00000-0 55401-3 0 9999
2 55031 97.5050 75.2820 0011913 181.9208 178.1979 15.12455204 1620
0 TBA - TO BE ASSIGNED
1 55032U 23001Z 23013.32278365 .00008829 00000-0 50914-3 0 9995
2 55032 97.5017 75.2722 0012981 175.0089 185.1273 15.12533230 1623
0 TBA - TO BE ASSIGNED
1 55033U 23001AA 23013.32282122 .00007977 00000-0 46081-3 0 9995
2 55033 97.4995 75.2713 0012160 179.7644 180.3595 15.12511677 1620
0 TBA - TO BE ASSIGNED
1 55034U 23001AB 23013.32283077 .00005544 00000-0 32180-3 0 9999
2 55034 97.5034 75.2794 0012633 177.3802 182.7497 15.12473002 1626
0 TBA - TO BE ASSIGNED
1 55035U 23001AC 23013.51682015 .00009996 00000-0 56464-3 0 9992
2 55035 97.5011 75.4721 0015443 180.3219 179.8004 15.13212742 1659
0 TBA - TO BE ASSIGNED
1 55036U 23001AD 23013.51777968 .00025537 00000-0 14363-2 0 9995
2 55036 97.5034 75.4750 0014453 182.6523 177.4634 15.13161033 1659
0 TBA - TO BE ASSIGNED
1 55037U 23001AE 23013.38235465 .00018123 00000-0 10080-2 0 9997
2 55037 97.5055 75.3539 0016151 176.9868 183.1464 15.13610683 1635
0 TBA - TO BE ASSIGNED
1 55038U 23001AF 23013.38122549 .00017058 00000-0 94423-3 0 9996
2 55038 97.5068 75.3578 0017198 179.5340 180.5910 15.13780897 1631
Until then here are the best fits on the satellites we have managed to receive:
| Satellite Identifier | Satellite Name | NORAD ID to Follow | Other Possible NORAD IDs | Notes |
|---|---|---|---|---|
| NJFB-9884-9643-7739-4519 | BDSAT-2 | 55038 | - | Received and for now only OBJECT AF(51038) fits |
| NJEX-6170-8600-1975-0468 | ION SCV-007 | None | - | Received but none of the published TLE fits |
| VPUU-7194-1121-2414-5647 | ION SCV-008 | None | - | Received but none of the published TLE fits |
| RJCF-5779-9216-5641-4111 | BRO-8 | 55012 | - | Received and best fit is OBJECT D(55012) but it is not perfect |
| PDVW-9191-3063-9872-9368 | Vigoride-5 | 55036 | - | Received and for now only OBJECT AD(55036) fits |
| KCKF-9169-8304-1813-6974 | Platform-2 | 55037 | - | Received and for now only OBJECT AE(55037) fits |
| TVZK-1463-5590-8994-0377 | Connecta T1.2 | 55012 | - | Received and for now only OBJECT D(55012) fits |
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TLE sets for ION deployers:
ION SCV-007
1 99216U 23013.20000000 .00000000 00000-0 00000-0 0 01
2 99216 97.5056 75.6774 0011240 12.1434 53.0126 15.12577458 02
ION SCV-008
1 99217U 23013.20000000 .00000000 00000-0 00000-0 0 02
2 99217 97.5056 75.1706 0009101 78.8707 341.0049 15.12656519 08
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@somecheese of the BDSAT-2 satellite team and I had scheduled 4 CW passes over my location. They programmed the satellite to start transmitting CW signals, and I had setup STRF to gather doppler data.
Space-Track has also released 30 TLEs of the 82 we are expecting. First of all, I ran an identification of the measured data against these (actually all) TLEs and find the best one. Which is 55038, BUT the RMS error is larger then it should be. The RMS error is 108 Hz, and if I fit MA and MM it drops down to 22 Hz, therefore I conclude that BDSAT-2 is NOT 55038, but probably one of the missing TLEs.
Comparing the last pass with the previous TLE I had posted (Not the intermediate one that @fredy posted) shows that the TLE got slightly off:
Usually it is a matter of fitting MA and MM on all data and we have new TLE, but now it gave a RMS error of 107 Hz. The data is of high quality, I had expected a lower error. Earlier I had problems with the dragterm B*, I added that in the fit, but it didn’t change anything. Next I also fitted RAAN and B*, and now the error for all data dropped to 22Hz. That looks more like it! The dragterm doubled to 0.5e-3 and that is closer to what I earlier copied from BDSAT, the previous sat:
For Satnogs to accept a new TLE the epoch value has to be newer then the existing TLEs. Therefor the TLE needs to be propagated, but this causes all parameters to change and give a bad fit again. Fitting again resulted in:
The TLE:
BDSAT-2
1 99244U 23014.37482639 .00000000 00000-0 58306-3 0 08
2 99244 97.5105 76.3305 0015448 169.9006 201.6424 15.13766169 08
# 20230103.80-20230113.86, 554 measurements, 0.022 kHz rms
Data used:
99244_BDSAT-2.dat (22.7 KB)
sites.txt (98 Bytes)
Hope this TLE holds up untill Space Track releases a TLE for BDSAT-2!
I like to thank @somecheese for enabling the CW beacon, and @cgbsat for providing the STRF software used!
Best regards, Eelke.
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ION SCV-007
1 99216U 23013.47414029 .00000000 00000-0 53004-4 0 06
2 99216 97.4044 75.3136 0001000 0.0000 117.9247 15.12783872 08
# 20230110.36-20230113.47, 81 measurements, 0.299 kHz rms
ION SCV-008
1 99217U 23013.47423550 .00000000 00000-0 60159-4 0 05
2 99217 97.3472 75.5796 0001000 0.0000 112.6553 15.12712441 03
# 20230110.37-20230113.48, 65 measurements, 0.085 kHz rms
99216.dat (3.3 KB)
99217.dat (2.7 KB)
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Thanks @EelkeVisser and @cgbsat both ION and BDSAT-2 have been updated with the new TLE sets.
Due to @EelkeVisser analysis I’ve removed to follow 55038 object for BDSAT-2 for now, we will keep watching and analyzing.
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Dear All,
We are very excited to announce the deployment of TAUSAT-2 from the D-orbit ION SCV-008 FIERCE FRANCISCUS last Friday. Currently, it sends beacons every 20 seconds.
Can you please add us to the Satnogs DB?
More details can be found in this link:
Thank you,
Dolev Bashi
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Satellite is added with the temporary NORAD ID 99205. The transmitter is also added but as non-coordinated by IARU as I can not find and entry in IARU Sat Coordinator. If I missed something let me know.
What is the S-Band frequency & bandwidth?
What modulation will be used initially?
Thanks!
Hi Fredy,
TAUSAT is the name of the satellite network. Both TAUSAT-1 and TAUSAT-2 share an identical set of frequencies therefore, the ITU registration is the same under the general TAUSAT name.
Thank you for the S-Band radio info!
What is the downlink frequency?