Thanks, @fredy!
I’ve checked the Ikhnos plot — the predicted and observed Doppler curves align quite well, confirming that RSP-03 = OBJECT XL (65732).
I’ve added a 
on the result page.
Appreciate all the work from the SatNOGS and Dwingeloo teams!
czh00361(estima5633)
RymanSat project
Hi,@PY4ZBZ
Thank you so much for the clear CW capture of RSP-03 and for sharing the plot.
May I ask a couple of details about your setup so we can better compare with other receptions?
With your permission, we’d like to use your numbers as a reference point to cross-check other stations’ results. Thanks again for the excellent report!
czh00361(estima5633)
Subject: RSP-03 reception by PY4ZBZ — link budget cross-check
HI,@PY4ZBZ
Thank you PY4ZBZ for your impressive reception report of RSP-03!
Your 10-element OWA Yagi with 15 dBi gain and 23 dB LNA (NF < 0.5 dB) achieved a very clean CW trace at 437.055 MHz around 22:06 UTC on 2025-10-06.
We confirmed that object 65732 (RSP-03) indeed passed over southeastern Brazil at that time, roughly 1000 km slant range and 30–40° elevation.
The resulting FSPL ≈ 145 dB → expected RX level ≈ −83 dBm, which seems consistent with your SDR# screenshot.
Could you please confirm if the observation was done with horizontal polarization only (no switching)?
We are trying to understand if the good SNR may imply partial antenna deployment or favorable polarization match.
The FSPL and RX level calculations were made together with ChatGPT for verification purposes — I believe they are reasonable, but would appreciate confirmation from other experts as well.
Many thanks for your excellent support to the amateur-satellite community!
czh00361 (estima5633),
Fresh news from Dwingeloo observations, in observation 12530297 CW signals were received.
With this observation we can confirm and identify that Dragonfly is OBJECT XH (65729). I’m going to update DB later today or tomorrow.
The singal is visible at ~3.88 KHz away from the center frequency, so we are going to add this drift in the transmitter entry in DB.
EDIT:
IQ files can be found in:
This RX was with pol H only. It seems that the satellite is spinning, and I have never been able to hear it again…
In https://network.satnogs.org/observations/12548804/ (H) and https://network.satnogs.org/observations/12548805/ (V) we tracked GHS-01 and saw convincing signals at the expected frequency and with the correct Doppler. So we are convinced that GHS-01 is indeed 65733. The signals look very strange (like a double helix in the spectrum), maybe an on board failure of some kind.
Here’s a usb demodulation of the recorded IQ, at -6kHz and 8kHz wide, wav:
12548804_usb.zip (271.7 KB)
Thanks for demodulation. We were also confused by the shape of the waveform, we suspect it may be due to some kind of onboard malfunction:
I don’t understand, how is this marked good?
All I see is a very faint, bent line typical of a Doppler affected terrestrial signal. Does this mean the TLE info is incorrect?
This is marked good automatically due to the existence of a demodulated frame, unfortunately this frame is a “noise” one and doesn’t come from the satellite.
The waterfall is not vetted yet, tbh I can see some chirps that may come from the satellite but it could be also noise, so I personally would vet it as bad.
This is indeed a terrestrial signal. The TLE set is right and accurate so we expect to see the signal in a straight vertical line.
If you have good eye sight, or a really good imagination, MAYBE a hint of RSP-03 on the 2.5-turn helical omni 14-Oct 1134utc over the Eastern U.S.
Could not find it in Inspectrum, so this is my only image.
Hi @K4KDR,
Great catch! It looks quite similar to what we observed here in Japan.
Using SDR# and a V-dipole setup, we detected a clear vertical trace around 437.0499 MHz on Oct 14 (UTC+9).
Here’s the capture: https://x.com/irotori_h/status/1974408503185100806
It might correspond to the same faint signal you spotted near 437.040 MHz — possibly RSP-03’s CW or GMSK beacon.
Dwingeloo has already confirmed reception of GMSK from RSP-03, so your signal could indeed be part of the same transmission path.
(https://network.satnogs.org/observations/12511022/)
Thanks a lot for your continued monitoring and for sharing your spectrum snapshot!
czh00361(estima5633)
Glad to help!
Please note that while my doppler tracking had moved farther to the left at the time of this screen shot, the observed mark (possibly from RSP-03) was right at 437.050 a few minutes earlier.
Just didn’t want anyone to think they should be watching at the lower freq. Will keep looking!
Thanks a lot, @K4KDR!
Observations like yours are very helpful.
Wider monitoring in Japan and Europe could really support our efforts to identify and improve the signal.
If you have any IQ data or raw captures, we’d really appreciate it if you could share them for further analysis.
czh00361(estima5633)
The 32-bit float I/Q file (samp rate = 78125) may be downloaded from:
IF that was a signal there at the mid-point, it’s very faint.
Dragonfly is now identified as 65729, ikhnos results can be found here.
Hi, @fredy,
Some time has passed, but I finally tried the ikhnos tool you previously recommended for the RSP-03 → OBJECT XL (65732) identification. From Japan I’m observing RSP-03 with a QFH antenna; my waterfalls often include multiple satellites, which makes the analysis a bit tricky. Even so, using ikhnos (with the workflow I summarized via ChatGPT), the predicted Doppler with the current TLE for 65732 matches my observations well (e.g., obs 12577597, 12571225, 12561003).
I’ll keep monitoring more passes to strengthen the evidence. Many thanks to you, LSF and the Dwingeloo team for the continued help and guidance.
czh00361(estima5633)
