Coverage map
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| Phase 4 AMSAT-DL planed |
Qatar Satellite Company’s second satellite, Es’hailSat-2 (OS-100), will be placed in a geostationary orbit by a Space-X Falcon-9 rocket in November 2018. It will carry an AMSAT linear transponder as a secondary payload, giving Radio Amateurs access to a geostationary satellite for the first time.
Es’hailSat-2 will be “parked” 35 786 km above the equator at 25.5°East, nearly due North from Pretoria and Johannesburg (which are at 28°E).
Planned Frequency.
This satellite will have two linear transponders. (250 Khz and 8Mhz wide)Narrow band transponder:
Up-links: 2400.050 - 2400.300 MHz modes SSB and CW. 5 Watt up link power,
Down links: 10489.550 - 10489.800 center 10 489.675 MHz. Vertical polarization.
Wide band transponder:
Up-links: 2401.500 - 2409.500 MHz
Down-links: 10491.000 -10499.000 MHz
It will be so nice to have fixed antennas mounted on mast pointing to the satellite having continuous communication to any where in Africa and Europe. HI ;-) ;-)
Will have to start looking for some equipment and antennas for this one.
Link to Live websdr http://zr6aic.giga.co.za:8902
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| Live SDR of Es'hail 2 OS-100 |
Here is a list of Equipment that should work for the P4A satellite.
X-Band 10 GHz Down link:
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HailSat-2 Down link configuration.Please note Some LNB's is using a 22khz tone to switch Polarization.Only the Generic LNB work with voltage switching. |
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| Click to enlarge Satellite Systems |
Here is how I inject my power. The black typed lead has an short peas of coaxle cable with an Inductor on Center peas going to a 13V Power supply.
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| Power DC blocker and Power injection |
Top coax go to LNB
Left Bottom go to SDR and has build in Cap to isolate dc from SDR
Right Bottom has inductor on center going to 13V Power supply
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| Power Injection and DC isolation to SDR |
I have change the LNB to new one here is the LO details
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| LO 9.75 for 13V |
Satellite frequency For now is 10.706 - 9.75 = 0.956Mhz
| For Narrow 250Khz Band Polarization is 0 deg V |
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| Add caption 0 Deg V Polarization |
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| 2.4Ghz Tx Grid |
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| Dish 60deg Elevation about 0 Deg Azimuth |
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| 2.4Ghz Transmitting Grid |
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| View from back of two Antennas |
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| 15db Grid antenna. just made it into satellite with ssb. CW was fine | . |
LNB (14 - 18V Polarization switching) 10.7Ghz
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| Generic one Port LNB Available from Giga Technology |
Link to Live websdr http://zr6aic.giga.co.za:8902/
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| Websdr http://zr6aic.giga.co.za:8902 |
I think the signal must look lie this
Linear transponder 2400.050 - 2400.300 MHz Up-link 10489.550 - 10489.800 MHz Down link
Wide band digital transponder 2401.500 - 2409.500 MHz Up-link 10491.000 - 10499.000 MHz Down link
My RTL dongle needs to listen on the following frequency
LO with 12V injection = lo - 10.489500Ghz + 1M to get center of bottom of the Spectrum on websdr
=9.75Ghz - 10.489500Ghz + 1Mhz = 7395Mhz (this is still debatable )
- 89 cm dishes in rainy areas at EOC like Brazil or Thailand.
- 60 cm around coverage peak,
- 75 cm dishes at peak -2dB.
Wide Band: linear horizontal polarization.
S-Band 2.4 GHz Narrow Band-Uplink:
- Narrow band modes like SSB, CW
- 5W nominal Uplink power (22.5 dBi antenna gain, 75cm dish)
- RHCP polarization
S-Band 2.4 GHz Wide Band-Uplink (DATV):
- Wide band modes, DVB-S2
- Peak EIRP of 53 dBW (2.4m dish and 100W) required
- RHCP polarization
Azimuth and Elevation details for Johannesburg South Africa.
(For now the Elevation is 59.17 and Azimuth 350.43)
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| Azimuth and Elevation from Johannesburg |
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| Paper with a piece of string at back of Dish |
Here is the Paper details
Gpredict tracking details.
Catalog number of Satellite is 43700 |
| It seems that the satellite is still rotating around the equator |
With the new TLE the Satellite has stabilized. at 59.17 Elevation and 350.43 Azimuth
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| Elevation is now 59.17 and Azimuth 350.43 |
2.4GHZ Transmitter.
The plan is to use my LimeSDR or hackrf for transmitter with low pass filter and a Power AMP. Details to follow
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| 2.4Ghz Transmitter Diagram |
Gnuradio Block diagram for Hackrf SSB
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| SSB Transmitter for Eshail2 |
Antenna setup
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| 15db 2.4Ghz wifi Grid Antenna |
Here is my presentation at the SARL on QO-100
My new transceiver setup.
- 1) Raspberry Pi 3B +
- Hackrf.
- MSI SDR dongle 10Mhz Bandwith 12bit. RX.
- 8W RF Amp.
- 40db Pre-Amp
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| My Eshail-2 QO-100 transceiver setup. |
Connect remotely via Wifi
Now start testing my Horizontal DBV-S2 Reception.
Video of DBV-S2 reception.
DBV-S2 decoding using leansdr (leandbv)
I will add more details soon.
https://docs.google.com/presentation/d/195l60I4IvKEl59Dl87AVFxjkrKzAcY5ZyUXNKXBXBcs/edit?usp=sharing
You can generate your own elevation and azimuth here http://www.satlex.us/en/azel_calc-params.html?satlo=&user_satlo=25.5&user_satlo_dir=E&location=-26.16%2C28.03&la=-26.16&lo=28.03&country_code=za&diam_w=75&diam_h=80
REF:
Information http://amsat-uk.org/2015/07/03/phase-4-spacecraft-frequencies/
and here http://www.itu.int/en/ITU-R/space/workshops/2015-prague-small-sat/Presentations/Eshail-2.pdf
Spectrum Analizer for RTL https://github.com/pavels/spektrum/releases
Frequency list http://frequencyplansatellites.altervista.org/Beacon-Telemetry_Europe-Africa-MiddleEast.html
Azimuth direction finding http://www.satsig.net/ssazelm.htm
