X-band beacons

**s-band** · 4. Juli 2017

1.2m Prodelin 2.5dB total system NF LHCP

12W WGS3
7600.000MHz 40dB SNR in 100Hz

28.2E Astra 2G (To be confirmed that it is not XTAR at 29E)
7676.000MHz 30dB SNR in 100Hz

**s-band** · 10. Juli 2017

1.2m Channel Master with LHCP feed and ~2dB NF LNA

17.8W Skynet 5C 7340MHz LHCP (-150Hz offset)

30W XTAR-LANT 7493MHz LHCP (-330Hz offset)

At the signal levels received, I did not see modulation but it needs confirmation that they are actually CW and beacons.

**s-band** · 13. August 2017

12.0°W WGS-3

Here's the TT&C on 7600.000MHz showing modulation. (2.4m PF)

The frequency read out is not quite correct. The beacon is within 300Hz of 7600.000

**s-band** · 6. Januar 2018

6.0°E WGS-1

7600.000MHz with 1024kHz sidebands typical of WGS series
About 35dB SNR in 1kHz
1.2m Offset Dish

**s-band** · 6. Januar 2018

42.5°W (incl.) USA 170 (DSCS-3 14)

2 beacons specific to the DSCS SLEP series (Service Life Enhancement Program), I think. One at 7600.000MHz the other at 7604.705MHz. The latter frequency differs from the info here: https://www.globalsecurity.org/space/systems/dscs_3.htm

WGS-1 (6.0°E) and WGS-3 (12.0°W) on Same Plot

Both nominally on 7600.000MHz but on this plot WGS-1 is in yellow and WGS-3 in green. Using the 8.4GHz RHCP feed so probably 10dB lower than usual (polarisation not determined at 7.5GHz). 1.2m dish.

Note the plot shows the carriers only. There is TT&C modulation on both signals.

**s-band** · 3. September 2018

Govsat-1 (21.4°E)

This plot was made whilst it was at 23.5E

7748.5MHz LHCP

This plot was taken on 10/7/23 whilst at 21.4E

**s-band** · 2. Januar 2019

30.0°W Spainsat

1.2m Offset dish with 8.4GHz LNA/Feed, Polarisation not adjusted
7749.5MHz RHCP (TBC). Another plot showing ~28kHz shift since the previous (analyser locked to GPS).

**s-band** · 4. August 2019

11.8°E Sicral 1B

1.2m Offset dish with 8.4GHz LNA/Feed, Polarisation not optimised

**s-band** · 4. August 2019

47.0°E Syracuse 3A

1.2m Offset dish with 8.4GHz LNA/Feed, Polarisation not optimised

Satdump will demodulate it to an encrypted binary stream.

**s-band** · 25. November 2020

30.0°W XTAR-Lant/ Spainsat

7250.518MHz LHCP

Waterfall added: 21.4MHz = 7250.518MHz

**s-band** · 26. März 2021

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

21.4MHz = 7662.5MHz

Edit 11/10/23 - See this post for an analysis

**s-band** · 10. Juli 2023

13.2°E ComsatBW-2

7676.0025MHz LHCP

37dB SNR in 100Hz on a 1.2m dish

**s-band** · 10. Juli 2023

42.0°E Turksat 3A & 4A

I don't know which is which.

A CW beacon on 7252.5MHz at 31dB SNR in 100Hz on a 1.2m dish

Another CW beacon on 7420.0MHz at 38dB SNR in 100Hz on a 1.2m dish

**s-band** · 11. Oktober 2023

49.0° E Syracuse 3A

7720MHz LHCP

5.2° W Syracuse 3B

7705MHz LHCP

45.5° E Syracuse 4A

7729MHz LHCP

All on a 1.2m dish, 1dB NF LNA, 9GHz LO, Airspy R2 on RPi, Satdump on Linux

3A close to trees

**s-band** · 11. Oktober 2023

29.0°E (Incl.) XTAR-Eur

7749MHz LHCP

1.2m dish, 1dB NF LNA, 9GHz LO, Airspy R2 on RPi, SDR++ on Linux

**s-band** · 11. Oktober 2023

30.0°W XTAR-Lant/ Spainsat (Analysis)

7662.5MHz LHCP & RHCP

This is a strange one. In the earlier post I was confused about the polarisation. I re-installed the system and whilst optimising polarisation noticed that there are both LH & RH signals present. The RH appears to be much stronger than the LH. The X polarisation rejection seems to be better for RH than LH but that needs to be re-checked.

The LH beacon was about 180Hz low of 7662.5MHz and the RH about 150Hz high.

LHCP

RHCP