And lets not forget the new HydraSDR RFOne that also has no center spike and great performance.
For now using it, in combination with a S-band down converter.
Jan | PE0SAT
2 Likes
Ok, success with decoding 400k baud packets from the 1.6M I/Q file very kindly provided earlier. You DO get a number of valid frames with the CRC check enabled, but naturally even more when both the ‘OK’ and ‘Fail’ outputs are monitored. (as shown in the screen shot of the GRC file farther down)
… please note the signal after muting the DC spike and shifting over a bit to center the data packet:
(this may or may not be the exact center - please experiment & improve!)
Here is the entire flowgraph (using a short crop of the original 1.6M I/Q file so there’s no wait for frames)
… which is available at the following URL if anyone would like to use portions of this in a flowgraph arranged to suit your personal preferences. (also please note that I’ve only tested w/ the 32-bit float I/Q file input - audio input blocks are present but I don’t expect that 400k baud can be decoded from audio) {so, I might add an SDR Source in the flowgraph for live decoding - but for now at least we can test w/ an I/Q file source}
1 Like
its work with satnogs? you have sample obs with this device?
Yes, have a look at station 2173.
Soapy support can be found at the HydraSDR github page.
Jan | PE0SAT
Check below for TLE:
old TLE sets
TLE set for PHASMA satellites:
PHASMA-DIRAC
1 98528U 25330.80269676 .00000000 00000-0 50000-4 0 01
2 98528 97.4380 36.0210 0011918 0.0000 345.3910 15.18682558 01
PHASMA-LAMARR
1 98531U 25330.80269676 .00000000 00000-0 50000-4 0 05
2 98531 97.4380 36.0210 0011911 0.0000 345.3910 15.18681301 03
Waiting to compare them with celestrak preliminary ones.
4 Likes
deprecated TLE
A new TLE set calculated better:
PHASMA-DIRAC
1 98529U 25330.76458333 .00000000 00000-0 50000-4 0 07
2 98529 97.4380 35.4833 0011918 0.0000 144.7372 15.18682558 09
PHASMA-LAMARR
1 98530U 25330.76458333 .00000000 00000-0 50000-4 0 09
2 98530 97.4380 35.4833 0011911 0.0000 144.7373 15.18681301 00
2 Likes
deprecated TLE
Updated TLE based on celestrak ones for launch date: 2025-11-28 18:18 UTC:
PHASMA-LAMARR
1 98530C 25276AE 25332.80257208 -.00021974 00000+0 -10938-2 0 04
2 98530 97.4397 38.1888 0001372 66.5176 286.5636 15.17686729 15
PHASMA-DIRAC
1 98529C 25276AF 25332.80269940 -.00022056 00000+0 -10977-2 0 03
2 98529 97.4396 38.1890 0001368 67.3306 286.4458 15.17689147 12
I’m working on an updated TLE that will be published later today before launch, however the above one can be used for the first hours after deployment.
2 Likes
deprecated TLEs
TLE generated by following this guide
PHASMA-DIRAC
1 98529U 25332.76458333 .00000000 00000-0 50000-4 0 09
2 98529 97.4380 37.4546 0011918 0.0000 144.7372 15.18682558 02
PHASMA-LAMARR
1 98530U 25332.76458333 .00000000 00000-0 50000-4 0 01
2 98530 97.4380 37.4546 0011911 0.0000 144.7372 15.18681301 02
Expected timeline for PHASMA mission:
| Relative to Launch Time | UTC Time | Action |
|---|---|---|
| T-00:00:00 | 2025-11-28T18:44:30Z | Rocket Launch |
| T+00:57:44 | 2025-11-28T19:42:14Z | PHASMA-LAMARR Deployment |
| T+00:57:55 | 2025-11-28T19:42:25Z | PHASMA-DIRAC Deployment |
| T+01:27:44 | 2025-11-28T20:12:14Z | PHASMA-LAMARR First Transmission |
| T+01:27:55 | 2025-11-28T20:12:25Z | PHASMA-DIRAC First Transmission |
Updated with the new launch time: 2025-11-28 18:44:30 UTC
3 Likes
New TLE based on the celestrak one but changed for the latest launch time: 2025-11-28 18:44:30 UTC:
PHASMA-LAMARR
1 98530C 14900A 25332.82097486 .00000000 00000-0 -10938-2 0 05
2 98530 97.4397 44.8319 0001372 66.5176 286.5636 15.17686729 07
PHASMA-DIRAC
1 98529C 14900A 25332.82110218 .00000000 00000-0 -10977-2 0 05
2 98529 97.4396 44.8321 0001368 67.3306 286.4458 15.17689147 04
1 Like
TLE generated by following this guide based on the new launch time: 2025-11-28 18:44:30 UTC
PHASMA-DIRAC
1 98529U 25332.78298611 .00000000 00000-0 50000-4 0 02
2 98529 97.4380 44.0978 0011918 0.0000 144.7372 15.18682558 05
PHASMA-LAMARR
1 98530U 25332.78298611 .00000000 00000-0 50000-4 0 04
2 98530 97.4380 44.0978 0011911 0.0000 144.7372 15.18681301 05
EDIT: Fixed NORAD IDs and Naming
1 Like
In ref to this post ( https://x.com/LibreSpace_Fnd/status/1994526523525931274 ), I was not able to decode from the audio.
By chance is an I/Q file available?
Thanks!
1 Like
Here is an IQ I recorded but not enough SNR
Jan | PE0SAT
2 Likes
If I remove the CRC block in GNU Radio, a couple of the packets from your I/Q file decode. Do either of these payloads look like what we should expect from the PHASMA sats?
2 Likes
The first one could be something but without the crc difficult to say.
1 Like
Post-launch TLE from satcat.com for PHASMA satellites:
0 PHASMA-LAMARR 799601753
1 99029U 00000AC 25332.82079396 .00000000 00000-0 47961-3 0 12
2 99029 97.4385 44.8326 0006532 1.7634 350.3547 15.16313754 04
0 PHASMA-DIRAC 799601754
1 99030U 00000AD 25332.82092127 .00000000 00000-0 47961-3 0 11
2 99030 97.4363 44.8329 0005848 7.4340 345.3837 15.16492238 02
Changed to the temporary NORAD ID used in SatNOGS DB:
0 PHASMA-LAMARR 799601753
1 98530U 00000AC 25332.82079396 .00000000 00000-0 47961-3 0 18
2 98530 97.4385 44.8326 0006532 1.7634 350.3547 15.16313754 00
0 PHASMA-DIRAC 799601754
1 98529U 00000AD 25332.82092127 .00000000 00000-0 47961-3 0 13
2 98529 97.4363 44.8329 0005848 7.4340 345.3837 15.16492238 04
Using the above, TLE set update for PHASMA-DIRAC based on Network and strf observations:
PHASMA-DIRAC
1 98529U 00000AD 25333.16074498 .00000000 00000-0 47961-3 0 01
2 98529 97.4363 45.3274 0005848 7.4340 38.9767 15.16033503 02
dirac_303_v1.dat (1.7 KB)
sites.txt (11.6 KB)
3 Likes
One small update on the TLE of PHASMA-DIRAC:
PHASMA-DIRAC
1 98529U 00000AD 25333.37408547 .00000000 00000-0 47961-3 0 00
2 98529 97.4363 45.5488 0005848 7.4340 123.3102 15.16881059 00
sites.txt (11.6 KB)
dirac_303_v2.dat (1015 Bytes)
1 Like
Got my first look at the PHASMA sats w/ decent elevation. Good signals in the waterfall (blacked out noise lines) for PHASMA-DIRAC, but could only decode w/ CRC-check block bypassed. Will test more w/ the strongest packets in capture; started w/ the most powerful burst at the 166-second point in my recording. Will get I/Q files uploaded asap & post URL.
6 Likes
First, if anyone would like a smaller download w/ only the strongest packets from my pass tonight, the URL is:
… this I/Q file is a Float-32 w/ Sample-Rate = 156250
5 Likes
And here is the entire I/Q (32-bit float, Sample-Rate = 156250).
Please note that the center freq was 400575000 because I was monitoring both PHASMA freqs.
The date/time stamp (20251130_033116) is UTC.
My location is: 37.78 N, 77.61 W
6 Likes