Today, at the alleged time of the RSP-3 pass, I several times observed a weak signal similar to CW with a pronounced Doppler effect.
The frequency is approximately 25 kHz below the calculated one, i.e. approximately 437.025 kHz.
I do not know any sat at this time at this frequency over KO33ru.
In SatNOGS observations I did not find this signal, or too far from the central frequency, or too weak.
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maybe because this we cannot find the signal track on waterfall, because satnogs default limited to 48 kHz, 24 below, and 24 above. is it possible for station to change manually the sample rate of waterfall ?
No, this is controlled by the observation and consequently flowgraph, which is based on the DB transmitters. The mode FM and CW will always result in 48k rate.
Also, only those with a downlink frequency range can be adjusted when scheduling. For this kind of search, iirc, @fredy wants a new transmitter suggestion set as unconfirmed. I’m not sure what the limit for frequency drift is.
this is good idea
@EU1SAT can you also check if any of these where visible at that time from your station:
ISS
1 25544U 98067A 25264.50666189 .00017816 00000-0 31405-3 0 9999
2 25544 51.6340 189.6600 0004358 3.8529 356.2493 15.50479098530107
OPAL (OO-38)
1 26063U 00004C 25264.58362947 .00000199 00000+0 84866-4 0 9998
2 26063 100.1964 146.9286 0036585 74.5007 286.0209 14.37812763344680
0 CHUBUSAT 2
1 41338U 16012B 25264.40702623 .00008047 00000-0 39344-3 0 9997
2 41338 30.9985 280.4189 0010171 217.9073 142.0851 15.16800917527515
0 CZ-4C R/B
1 43012U 17072C 25264.54789851 .00000638 00000-0 13564-3 0 9992
2 43012 98.5746 358.9836 0122088 259.1604 99.5834 14.58393077417479
0 ESEO
1 43792U 18099AL 25264.60749471 .00003178 00000-0 24030-3 0 9990
2 43792 97.4370 308.1033 0012651 165.4946 194.6645 15.02978692371448
0 DEKART
1 46493U 20068H 25264.58380921 .00015110 00000-0 53462-3 0 9998
2 46493 97.8670 251.3195 0012180 144.6613 215.5436 15.29192779274605
0 OSCAR 16 (PACSAT)
1 20439U 90005D 25264.59911418 .00000192 00000-0 85982-4 0 9997
2 20439 98.8851 288.5549 0009647 302.6354 171.4494 14.33810485863441
0 OBJECT A
1 55009U 23001A 25264.41233759 .00013947 00000-0 43004-3 0 9996
2 55009 97.3595 323.8240 0006776 17.5755 342.5721 15.33685946150906
0 KUWAITSAT-1
1 55103U 23001CY 25264.41369276 .00018974 00000-0 52618-3 0 9991
2 55103 97.3648 327.8852 0009681 337.2147 22.8667 15.36932284151134
0 RUZAEVKA-390
1 61766U 24199AH 25264.58298057 .00054867 00000-0 10697-2 0 9999
2 61766 97.3333 135.3673 0009972 143.1568 217.0369 15.47297033 93066
0 OBJECT K
1 57175U 23091K 25264.44062303 .00013091 00000-0 58858-3 0 9992
2 57175 97.5477 321.1259 0010860 347.4115 12.6847 15.21205172123335
0 OBJECT AA
1 57190U 23091AA 25264.47124606 .00046346 00000-0 10992-2 0 9992
2 57190 97.5447 330.9938 0004489 281.5217 78.5526 15.41580053123984
2023-091AS
1 57206U 23091AS 25264.48769328 .00032784 00000+0 96346-3 0 9995
2 57206 97.5450 328.5992 0005416 296.5618 63.5069 15.35037161123831
0 OBJECT AV
1 57217U 23091AV 25264.42944068 .00012622 00000-0 55425-3 0 9990
2 57217 97.5484 322.0184 0011796 327.5124 32.5384 15.22013203123380
EQUALIZER03 HERONMK2
1 70375C 23174CC 23315.83661433 -.00026412 00000+0 -14574-2 0 09
2 70375 97.4819 28.7762 0009329 264.3585 154.3842 15.14010932 14
0 SONATE-2
1 59112U 24043Q 25264.63811983 .00027953 00000-0 71460-3 0 9996
2 59112 97.5266 38.2285 0010905 102.9605 257.2859 15.39356398 86320
2024-125A
1 60203U 24125A 25264.36362600 .00028083 00000+0 68216-3 0 9996
2 60203 97.2653 115.3011 0018985 118.1260 242.1908 15.40780569 67922
R5-S4
1 60206U 24125D 25264.56250014 .00014834 00000+0 45475-3 0 9997
2 60206 97.2692 113.6241 0021794 117.8119 242.5336 15.33636518 67829
0 MORDOVIA-IOT
1 61765U 24199AG 25264.57925007 .00065085 00000-0 11630-2 0 9991
2 61765 97.3333 135.8306 0009815 142.2265 217.9677 15.49757457 93090
0 OBJECT BE
1 61787U 24199BE 25264.62271637 .00011215 00000-0 38618-3 0 9996
2 61787 97.3381 131.1080 0015162 181.0824 179.0387 15.30094383 95932
0 OBJECT BA
1 61783U 24199BA 25264.59037859 .00071578 00000-0 12926-2 0 9995
2 61783 97.3301 135.1003 0011968 158.5976 201.5778 15.49405143 96202
0 OBJECT AS
1 61775U 24199AS 25264.61264270 .00016031 00000-0 47998-3 0 9999
2 61775 97.3375 132.0172 0018995 162.8108 197.3783 15.34427609 92848
0 INNOCUBE (TUSAT-31)
1 62616U 25009H 25264.16562146 .00009887 00000-0 44740-3 0 9991
2 62616 97.4166 342.5757 0006560 187.3343 172.7798 15.21082418 37840
POQUITO
1 98706U 25009BY 25021.90669764 .00000000 00000-0 -14212-2 0 09
2 98706 97.4429 104.2661 0003354 352.9277 63.3351 15.17186318 09
RSP-03
1 98654U 98067A 25263.34858520 .00000000 00000-0 26251-3 0 07
2 98654 51.6324 195.5052 0004198 355.4694 19.4145 15.51326978 01
GHS-01
1 98541U 98067A 25263.34858520 .00000000 00000-0 26251-3 0 02
2 98541 51.6324 195.5052 0004198 355.4694 19.4145 15.51326978 06
@bali
Before adding another transmitter for experimenting, I would suggest we get a couple more observations from different locations from this signal.
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All these satellites except 55103 and 70375C are in my base and have already been checked.
NOTE
The following objects from your list are active and unequivocally defined (I often demodulate them):
55009 (OBJECT A) - STAR-VIBE
57175 (OBJECT K) - CubeBel-2
57190 (OBJECT AA) - NANOZOND-1
61783 (OBJECT BA) - ZIMSAT-2
3 Likes
RSP-03 437.050 kHz over KO33ru:
12:45-13:25 UTC - NOTHING HEARD
14:05-15:00 UTC - NOTHING HEARD
15:50-16:40 UTC - NOTHING HEARD
17:40-18:05 UTC - NOTHING HEARD
19:20-19:50 UTC - NOTHING HEARD
at 437.025 kHz Unknown satellite heard again
16:18-16:26 UTC
17:59-18:01 UTC
19:38-19:39 UTC
4 Likes
Thanks for sharing the audio file, listening, I immediately reconsigned the garbled AO-16 tones and that is sometimes active on 437.026 MHz
I guess when you add object 20439 you will see Amsat Oscar 16 also passing.
Jan | PE0SAT
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According current TLE It can’t be 20439 !
Or Space-Track again confused the satellites in places?
2 Likes
MTV …MT approximately in CW as I hear
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Thanks,
Looking at the date and time AO-16 shouldn’t be in your foot print.
A mystery, let investigate further.
Jan | PE0SAT
2 Likes
I have heart the signal before, can you try and listen to IQ that belongs to this observation SatNOGS Network - Observation 9305336. This IO-26.
The IQ file can be found at this location
This are the details of the recording and can be replayed with SDR#, SDR++ or similar.
Input File : 'iq_48000_9305336.wav'
Channels : 2
Sample Rate : 48000
Precision : 16-bit
Duration : 00:08:36.29 = 24781702 samples ~ 38721.4 CDDA sectors
File Size : 99.1M
Bit Rate : 1.54M
Sample Encoding: 16-bit Signed Integer PCM
Jan | PE0SAT
1 Like
So this isn’t CW but BPSK 1200? What about the frequency difference?
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According current TLE It can’t be IO-26.
Maybe it’s time to create a separate topic?
2 Likes
@EU1SAT I checked your observations and based on the UTC timestamps you provided either in the screenshot or the text, here is the list of the LEO satellites that were passing over your station (at KO33ru) at all these timestamps:
| NORAD ID | Satellite Name |
|---|---|
| 25544 | 0 ISS (ZARYA) |
| 36827 | 0 PRISMA (TANGO) |
| 49044 | 0 ISS (NAUKA) |
| 63129 | 0 PROGRESS MS-30 |
| 63520 | 0 SOYUZ MS-27 |
| 64751 | 0 PROGRESS MS-31 |
| 65077 | 0 DRAGON ENDEAVOUR 6 |
| 65304 | 0 DRAGON CRS-33 |
| 65586 | 0 PROGRESS MS-32 |
| 65616 | 0 CYGNUS NG-23 |
To be honest I wouldn’t expect any of them to transmit at ~437MHz, so my guess is that it could be one of the deployed satellites. Except if we miss something.
2 Likes
Sorry to all for the confusion I maybe added to this topic, AO-16 sounded pretty convincing.
The search continues.
Jan | PE0SAT
2 Likes
Unknown satellite is ISS !!!
“The truth is out there”
SDRSharp_20250923_152914Z_437035028Hz_AF.zip (7.5 MB)
IQ Files in my Telegram channel:
4 Likes
Unexpectedly an unknown satellite is the first object from your list 
1 Like