The Es'Hail 2 satellite was launched in November 2018 and supports the first geostationary ham radio transponder. On this page you see:
Future development may include digital voice, images, text using Opus as the codec and up to 32 QPSK carriers in a 2.5 to 3 kHz bandwidth (we have the bandwidth, let's use it). Opus is an outstanding codec with excellent compression.
Here's a link to G4ELI's station - still being assembled.
Here's the Es'Hail 2 footprint. Use the Satellite option in SDR Console to display:
There is a very small amount of Doppler, even for a geostationary satellite, but not enough to worry about.
And here's the software in action.
Follow these steps to successfully configure the console to receive with any SDR and for transmiteither the Pluto or Lime SDRs.
To display a frequency greater than 9.999 GHz open the Program Options and navigate to Display, Spectrum. Select a frequency range of 99.9 GHz, then press [OK].
The narrow band transponder details are show below.
Define a Downconverter offset for the LNB (a LNB is a downconverter), the offset is the LNB's local oscillator frequency, for example 9,750MHz. This value is selected when starting the SDR.
In the Radio Definitions window check Converter selection, then press Edit.
In the converter definitions window add a down-converter using the LO frequency of your LNB. Usually this is 9.75 GHz but it's quite common for a LNB's oscillator to vary, for example the Octagon LNB in use at G4ELI has a frequency of 9.750190 GHz (190 kHz higher than 9.75 GHz), so in the window below you would enter 9.750.190.000 .
Ideally the frequency you enter results in the Es'Hail 2 beacons being within 10kHz of their nominal frequency as this makes the beacon locking easier.
The BATC has an interesting page on their Wiki Es'hail-2 LNBs and Antennas.
Now start the SDR, selecting the new down-converter definition.
From the transmit options, add an offset which is then added to the displayed transmit frequency. For Es'hail 2 this offset is 8089.5 MHz.
In the Transmit DSP enable Sync RX so the receive and transmit frequencies are the same.
(Available in 3.0.7) Enable the Geostationary Beacon option: Ribbon Bar, View, More Options..., check [X] Geostationary beacon.
Note: the idea for synchronising with the telemetry beacon comes from Moe Wheatley (AE4JY) in his AO-40 Telemetry Decoder Project. Moe's code explains how the data beacon works as the QO-100 beacon is the same as that in AO-40 (RIP). The implementation here was coded from the the ground up to ensure it is as efficient as possible, every saved cycle helps!
The telemetry beacon frequency is 10.489.800.000 Hz, or 10,489.800 MHz. The beacon transmits BPSK, simple BPSK decoding software can determine the offset from the nominal center frequency, so compensation for an un-modified consumer LNB is possible.
Follow these steps:
Use the Save 💾 option to download the offset data to a CSV file, this file can be viewed with programs such as Excel.