Mode QO 100

QO-100: the amateur satellite's transponders with exact frequencies from its beacons.

Group	Satellite & navigation
Default sample rate	10 Msps
In the mode list	Es'hail-2, 10.49 GHz

Step-by-step: Tutorial-QO-100

What QO-100 is

QO-100 (Es'hail-2) is the first geostationary amateur radio satellite, covering Africa, Europe, the Middle East and Asia, with a narrowband and a wideband transponder at 10.49 GHz.

Frequencies and settings

Es'hail-2, the geostationary amateur satellite: downlink 10489.5 - 10500 MHz through a Ku LNB (IF 739.5 - 750 MHz with 9750 MHz; 9739, 10000, 10600 or any LO).

Setting	Value
Tuning range of the mode table	50 to 1200 MHz
Sample rate asked	10 Msps
Lowest working rate	2 Msps
Channel width	10 MHz

OnAir takes any frequency you type; the numbers above are the mode's starting point and the range its table describes. In the app the shortcut label is Es'hail-2, 10.49 GHz.

What OnAir shows

Beacon lock: the CW beacons measure the LNB's frequency error and drift (kHz, ppm, history) and correct every frequency shown; the narrowband transponder as a high-resolution spectrum and waterfall with SSB listening (USB, 2.7 kHz); the wideband transponder's DATV carriers with their symbol rates and a hand-over to DVB-S/S2.

Tips and caveats

• Checked with generated signals and impairments; recordings of real signals welcome.
• Which radio: Probably not: an RTL-SDR tunes up to about 1.7 GHz. A HackRF (1 MHz to 6 GHz) or another wideband radio is the usual choice for this frequency range.
• Try it without a radio: most modes include a built-in synthetic test signal, so you can open the screen and try the controls first.
• Receiving and the law: Receiving satellite downlinks is generally legal. Encrypted or spread content is not decoded, and voice codecs that are patented are not shipped with OnAir. See Legal.

Related pages

• All modes, Satellite & navigation
• Supported radios, Troubleshooting, FAQ
• More in Satellite & navigation: GNSS, Inmarsat-C, Inmarsat Aero, Iridium, Meteor-M LRPT, GOES HRIT, Elektro-L, Orbcomm, CubeSat telemetry, Globalstar