This is an ISRO launch for Bluebird 06.
The satellite has got grant from FCC to transmit in the range of 430-440 MHz.
Theoretically we expect a signal at 435 MHz with baudrate 19k2, but it could be anywhere in this 430-440 MHz range.
This UHF range will be used outside US and only for Emergency TT&C Communications (space-to-Earth and Earth-to-space)
TLE based on launch time 2025-12-24 02:50 UTC
Bluebird 06
1 98451U 25358.12152778 .00000000 00000-0 50000-4 0 05
2 98451 53.0000 47.4847 0001450 0.0000 162.6222 15.15323704 03
While the 70cm downlinks on the previous BlueBird sats may or may not be the same on this one, I wanted to share just for reference.
Freqs listed were: 430.5 MHz, 432.3 MHz, 434.1 MHz, 435.9 MHz,
and 439.5 MHz
… and the 2k4 / Light-1 demod settings were:
… finally, here is a session from 26-Sep-2024 (BlueBird-5):
Thanks Scott,
This should also work but needs some tuning after reception.
name: BLUEBIRD-6
norad: 98451
data:
&tlm Telemetry:
unknown
transmitters:
2k4 FSK downlink:
frequency: 435.800e+6
modulation: FSK
baudrate: 2400
deviation: 600
framing: Light-1
data:
- *tlm
9k6 FSK downlink:
frequency: 435.800e+6
modulation: FSK
baudrate: 9600
deviation: 2400
framing: Light-1
data:
- *tlm
19k2 FSK downlink:
frequency: 435.800e+6
modulation: FSK
baudrate: 19200
deviation: 4800
framing: Light-1
data:
- *tlm
Launch datetime has been changed to 2025-12-24 03:24 UTC
TLE set for the launch time 2025-12-24 03:24 UTC:
Bluebird 06
1 98451U 25358.14513889 .00000000 00000-0 50000-4 0 01
2 98451 53.0000 56.0079 0001450 0.0000 162.6222 15.15323704 06
BlueBird 6, built by Texas company AST SpaceMobile, will lift off atop an LVM3 rocket from India’s Satish Dhawan Space Centre tonight at 0324 UTC
@db2os I’ve moved your messages to in this topic as it is dedicated for the Bluebird 6.
According to the stream the launch time will be around 2025-12-24 03:25:29 UTC
For this launch time, this is the updated TLE:
Bluebird 06
1 98451U 25358.14616898 .00000000 00000-0 50000-4 0 05
2 98451 53.0000 56.3798 0001450 0.0000 162.6222 15.15323704 07
Lift-Off!
Hopefully in about 15 minutes we’ll have deployment of the sat.
goooooo!
auto award for violator sat.. 
A new TLE update based on the data from launch stream at the separation time, 3:41 UTC:
Bluebird 06
1 98451U 25358.15347222 .00000000 00000-0 50000-4 0 08
2 98451 53.0000 54.5750 0001450 0.0000 191.6300 15.15323704 04
Not fully confident about it, but I think it should be closer to the real orbit. Use with caution. 
PS it is ~3min different from my previous calculation:
A small fix on the previous TLE at separation time based on a small change on the position of the rocket at the separation time:
Bluebird 06
1 98451U 25358.15347222 .00000000 00000-0 50000-4 0 08
2 98451 53.0000 52.7337 0001450 0.0000 193.7915 15.15323704 00
as ussual, for new sat, auto schedule by @fredy
Ok, nothing heard on the 70cm & S-Band freqs previously used by the other AST sats, Mid-Atlantic USA. Of course, it could be too early since antennas have to be deployed, etc. And with this being a larger, commercial sat, there are solar panels and other things to attend to as well. So, will keep watching on future passes.
let make a hot coffee 
Scott, can you share the previous S-band frequencies used?
Jan | PE0SAT
