Tracking Request of JINJUSat-1B

Satellites & Observations
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Hello again,

My name is Hongju So.

I’d like to request you to tracking and observing the JINJUSat-1B’s signal.

The JINJUSat-1B will be launched 25.03.15 06:39 UTC and be deployed 25.03.15 07:34 UTC. (Expected)

JINJUSat-1B’s transmitter spec is as follows :

  • Frequency : UHF 435.185 MHz
  • Protocol : AX.25
  • Modulation : BPSK-G3RUH
  • Data rate : 9600bps
  • Beacon interval : 10s

Beacon example and included information is in the following attachment.

JINJUSat-1 Beacon TM Information.pdf (288.8 KB)

You can use the UZ7HO’s soundmodem(version : G3RUH-BPSK-9k6) to decode JINJUSat-1B’s signal.

Thanks for your help.

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Hi Hongju,

In November 2023 I followed your tracking request for JINJUSat-1.
Unfortunately, a deployment malfunction happened so JINJUsat-1 was lost.

I wish you good luck for this time with the successor JINJUSat-1B.

Since -1B is also IARU uncoordinated but will transmit on an amateur radio frequency, what can the amateur satellite community expect from your satellite in terms of amateur satellite service?

Will there be QSL cards to confirm reception reports?

73
Daniel, dl7ndr

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Hello @hongjuso,

Regarding SatNOGS network tracking on JINJUSat-1B, since your satellite will operate on ham radio band and has the status IARU UNCOORDINATED, the satellite will be followed the first days for SSA operations, but after that, due to this status, only few stations will be able to track it (but still it should only be related to SSA activities) and there will be some limitations regarding data availability :slight_smile:

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Hi Hongju,

I’ve received, decoded and uploaded 12 beacons from JINJUSat-1B on 2025-03-15 at around 09:28.

73
Daniel

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Hi Daniel,

Thank you for your kindness help.

Could you please send me 12 beacons via my email address?

My email address is hjso90@ktl.re.kr.

Again, I really thank for your help.

Best regards,

Hongju So

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Sent.

A few values from your ‘Beacon TM Conversion’ table:

96 A8 98 8E 9C AA E2 94 92 9C 94 AA A6 63 03 F0 08 02 C1 D9 00 6E 10 03 19 00 61 9D BF 66 04 01 02 00 00 00 01 00 00 00 00 10 00 00 19 7D 20 73 00 00 0B DF 0B FC 00 D3 00 AF 00 29 00 B2 02 05 00 02 00 0D 00 0D 00 0E 00 0D 00 0A 00 09 01 00 06 B2 00 0D 0E 00 D4 00 02 00 05 00 00 00 06 00 07 00 07 00 08 09 AF FF 86 20 5E 00 15 00 0B 00 23 00 00 00 09 00 09 3E F8 5A E8 BE 0C 94 A4 BE 30 3C CC 49 68

Beacon from 2025-03-15 09:26:52 UTC

Operating Mode Status 04 = Standby Mode
Antenna Deploy Status 01 = Deployed
OBC # Reset Counter 02
Received Command Counter 00 00 00 01
Rcvd Cmd Error Counter 00 00 00 00
OBC Temp 10 = 16°C
OBC Uptime 00 00 19 7D = 1.8125 hours

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Screenshot_30
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About 10 packets were heard and decoded by me here in Brazil :brazil: around 13:56UTC

I hope we have a program to issue digital QSL cards for this satellite !!

“The times are weird because I decode from an IQ file I recorded”

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JINJUSat-1B RAW Telemetry
36 Frames uploaded to SatNOGS DB

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Strong signal from JINJUSAT-1B over brazil

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Scheduling observation that starts at 2025-03-18 04:17:41 UTC exceeds scheduling limit for the period from 2025-03-16 08:51:48 UTC to 2025-03-18 04:30:48 UTC Reason for scheduling limit: JINJUSat-1B(98650) is frequency violator satellite

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