Pslv-c60/spadex

[K4KDR]

Hello! The ISRO PSLV-C60/SPADEX mission launched a short time ago. The target orbit is a 55° inclination, so the deployments will have much better visibility to most of us than some of the previous, lower latitude ISRO orbits.

The launch is streaming at: https://www.youtube.com/live/_OBGAiJrjJU

There are several payloads that might be of interest to us.

In addition to the primary mission payload (SpaDeX Mission), which lists VHF, UHF, & S-Band freqs ( Frequency range result ), there are also:

BGS ARPIT ( IARU Sat Coordinator ) ( GitHub - Raisa0608/BGS-ARPIT )

-and-

Swetchasat ( Frequency range result )

… and several other sats that I have not fully researched yet.

Here is a document that contains a lot of info about the mission goals as well as the secondary payloads:

https://www.isro.gov.in/media_isro/pdf/Missions/PSLVC60/PSLVC60-mission-brochure-english.pdf

Let’s hope the deployments go well and we have some more satellites to track!

[K4KDR]

Ok, looks like a good deployment of the primary payloads (-2- sats that will conduct docking & related experiments together).

There will be an orbital altitude change before the other payloads are deployed.

[tckb]

I am still looking at all the payloads too @K4KDR the payload document only suggests UHF. The frequency range result suggests the swetchsat uses LoRa but I am not 100% sure.

[K4KDR]

Looks like the first 3 objects have been assigned from this launch!

[deepak26]

POEM-4 TLE is added to celestrak.org

[fredy]

Feel free to suggest satellites from this launch and their transmitters in DB.

For satellite suggestions:

1. Login in SatNOGS DB
2. Go to All Satellites section in the left menu
3. At the top right click on Edit button and choose Suggest New Satellite
4. Leave blank NORAD ID if it isn’t known or satellite isn’t identified

For transmitter suggestions:

1. Login in SatNOGS DB
2. Go to the satellite page (if new satellite you can access the last 5 from the home page)
3. At the top right click on Edit button and choose Submit New Transmitter
4. If modulation isn’t know please choose the FM one.

[vu3tyg]

Thanks, I have submitted for satellite and transmitter suggestions for BGSARPIT. Yet to confirm from ISRO if the payload will be turned ON for global services or over India only.

73, Nitin ,VU2JEK
Secretary, AMSAT INDIA

[fredy]

Thanks I’ve reviewed it and I’ve made some small fixes.

The Satellite is ready to be scheduled in the Network, I’ve scheduled a couple of them

[vu3tyg]

Great, Thanks Fredy, During the 15.30 UTC pass over India we have heard the SSTV and APRS Beacon, Confirming with ISRO if the payload will be turned ON for global services.

[dl7ndr]

Hi Nitin,

Thanks for the information.

I’m trying to understand the sequence for the payload.
Once switched on, it stays on for 15 minutes.

First comes a 45 seconds audio, then 1 minute silence while switching to digipeater.
How long does the digipeater stay active until it switches to SSTV?

Daniel

[K4KDR]

POEM-4 pass just ending over the U.S. East Coast; nothing heard on 145.825, 145.870, or 436.500. However, the max elevation was only 22°, which is not good at all for my location (unless the transmitter is very strong).

Are the ride-along sats deployed, or all still connected to the launch vehicle at this time?

Thanks!

[vu3tyg]

The payload are bolted to the last stage of PSLV and in orbit. They will not be deployed.

[vu3tyg]

Hi Daniel,

The 1 minute silence is the digipeater mode where someone has to digipeat.

73
Nitin

[K4KDR]

And sorry, I’m not clear from the discussion if we know whether BGS ARPIT will be active world-wide or only over India.

Has that been determined yet? Thanks!

[vu3tyg]

Orbit 32 15.00 Hrs UTC On Jan 1st will be global

[dl7ndr]

Just to understand you correctly.

Am I right, that you only made a statement about orbit no. 32 and that on this orbit at 15:00:00 utc the 15 minutes timer will be activated (once)?

Will following transmissions also be global?
Will there be a schedule?

[K4KDR]

Had better elevation for a POEM-4 pass tonight (Eastern U.S.) but nothing seen on 436.500, 145.825, or 145.870.

I actually thought I had a signal starting at just the right time & place for a beacon from ‘something’ on 436.500, but turned out it was the END of some other object!

[K4KDR]

Very high-elevation pass of the POEM-4 module this morning but no signals seen.

Have downlinks been observed from any of the payloads on POEM-4?

[K4KDR]

Great news - whether we are catching any downlink signals or not, apparently ISRO is conducting comms w/ POEM-4:

ISRO (@isro) on X

-and-

ISRO (@isro) on X

[pe2bz]

I have 62460 - SDX02 on S-band, 2210 MHz , wide signal:

62460 SDX02