Zarya - Soviet, Russian and International Spaceflight
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Tyneside, UK
2021 Apr 14
Wednesday, Day 104

Maintained by:

Omid Frequency Registration

Iran registered two frequency bands with the International Telecommunications Union prior to the launch. One was for the uplink from the ground to the satellite, the other was the downlink. As part of the registration process, the orbit was given as 250 x 530 km with an inclination of 56.87 degrees.

Uplink (MHz) Downlink (MHz)
401.000 to 401.025464.9875 to 465.0125

The range of frequencies in each case takes account of signal bandwidth and the Doppler shift that would be experienced by an observer. The purpose of registration is to ensure that another operator does not choose the same frequencies and cause interference to operations. Thanks go to Sven Grahn for providing the registration information.


On launch, the Iranian news agency mentioned that Omid operates in "...two frequency bands". This is a reference to the existence of uplink and downlink frequencies. There is no indication of a second downlink frequency.

The downlink frequency range is what can be tracked. It centres on 465.000 MHz so it is easy to tune a receiver and easy to get a reasonable determination of the time of closest approach by noting when the received frequency passes through 465.000 MHz.

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Freq (MHz) Satellite Mission Signal Type Notes