Posts by s-band

This is unusual, it's one of the most inclined geo satellites still in use and is circular polarised. It was received using a linear feed. It looks like all slots, except 2 at the low end, are in use. It would be interesting to see what's actually there using circular polarised feeds. I think it's data not GS but perhaps someone else can confirm it. The downlink band is about 12200-12700MHz. It was at about +12.2° latitude at the time of observation.

The beacon plots are here: RE: Beacon Levels & Spectra

18.0°E (Incl.) AMC-14

Two telemetry beacons; one on 12694.5MHz Vertical and the other on 12698,5MHz circular polarisation (received using linear feed). +11.15 degrees latitude at the time of observation.

Searching for Luch 5B at 13.5GHz I noticed this at -3.4 deg latitude at the time.

The transponder noise is visible from 12.5-12.75GHz.

Polarisation is horizontal.

16.3°W (Incl.) Luch 5B

https://spaceflight101.com/spacecraft/luch-5b/

https://en.wikipedia.org/wiki/Luch_5B

The plots here were done to try to find any transponder noise from Luch. However, the only thing confirmed as being from Luch is the beacon on 10747.5MHz, circular polarisation. There is only about 0.3dB excess ground noise plus a spurious on 12450MHz and some side lobe pick-up from 15W. The UK may be too far West to see much. If anyone could look from the East, it would be interesting. A good time might be during journeys of Soyuz capsule to and from ISS.

16.3°W (Incl.) Luch 5B

10747.5MHz circular polarisation. No sidebands visible to me on a 1.2m dish

Quote from qwer

Just my test setup with AN8024 transceiver on 1,2m dish.

You might find it better to not use the modem but to power it directly from the 24V PSU. That way the 10MHz does not enable the TX part and it will run a lot cooler. The LED will then be red indicating a fault.

qwer I think you either found transponder noise from 20.2-20.7GHz (LHCP) or it is spread spectrum (green line is base reference). What ever it is, there's a lot of power in it.

There seem to be 4 carriers, spaced at about 2.6MHz. 2 LH and 2RHCP. The X polar rejection is not good on the AN8024 but the plots are attached.

I think that this is Syracuse 3A. I don't see any DVB but there are 2 bands of transponder noise. One at the low end which has what looks like FHSS signals. The other a 15MHz wide one centred on 7495MHz. This may be what you are seeing qwer, CS often shows BPSK as a cross. There are 2 continuous BPSK signals and 2 burst BPSK/CW signals. The strongest, on 7499 appears to have a symbol rate of 12KHz, the other 6kHz. The vector plot is the best I can get as the analyser will not go below 13kHz so it's set to 2x12kHz.

The waterfall displays are centred on 21.4MHz = 7495MHz and the upper display is frequency inverted.

Received on an 8.4GHz RHCP feed which has poor rejection of LHCP. The signals are probably LHCP

I'm assuming that this is a beacon on 7662.5MHz RHCP. The polarisation needs to be confirmed.

21.4MHz = 7662.5MHz

1st image from Arktika:

https://www.roscosmos.ru/30436/

It's been a long time since I've seen this. The fast Doppler makes Mars craft difficult but I caught it at a time of slower change.

It was -122dBm on DSS65, Madrid at the time with 550kBd data and at 246.3Mkm.

21.4 = 8445.346MHz

The Chang'e 5 orbiter is now orbiting the L1 point after dropping its Lunar samples at Earth.

https://spacenews.com/change-5…sun-earth-lagrange-point/

Still a good signal. Thanks to DF2MZ for the coordinates.

8471.230 = 21.4MHz

Was -106dBm at 14:00, -98 at 15:00, -96dBm 15:30, -94dBm at 15:53

21.4MHz = 7865.000MHz

https://nssdc.gsfc.nasa.gov/nm…splay.action?id=2007-004B

According to the link above it is in equatorial lunar orbit with periapsis altitude of approximately 100 km and apoapses of 19000 km. (To be verified) It was -109.3dBm, 550kBd on DSS63 at the time. A second frequency of 8445.336MHz at 11Bd and -148dBm was far below my threshold.

8438.9626MHz = 21.4MHz on plot

Arktika-M-1 weather satellite in a Molniya orbit https://www.nasaspaceflight.co…z-2-launches-arktika-m-1/

7865.021MHz = 21.4MHz on plots, RHCP

Signal level approximately -100dBm at the feed

Quote from qwer

I can confirm the last wide mux, Feedsat foundtwo years before... (using band C LNB here)

I think they are the pair in this post 30.0°W SpainSat

It looks they have different relative levels for you.

Mars Orbiter Mission (MOM, India)

Best S-band DX so far at 223.2Mkm

1.2m dish

512ks/s

Here' a waterfall of the transponder. It was at 18Ms/s but the Pluto can not run at that rate continuously so the plot was recorded in bursts. The FFT was 132k.

Here are waterfalls of the upper and lower transponders.

5Ms/s, 132k FFT

1.2m dish RHCP feed