1/25/2024 0 Comments Iss downlink frequencyThis high speed makes radio signals appear to shift in frequency, a phenomenon called Doppler Shift. The International Space Station is traveling around the Earth at over 28,000 km/h. There are a number of websites that tell you when to listen such as the N2YO site.Īstronaut Sunita Williams KD5PLB on the ISS This means you need to make sure you’re listening at the right time to hear it. The ISS is in a very low orbit and so is only in range 5 or 6 times each day and then only for a maximum of 10 minutes on the best orbit. You should never transmit on 145.800 MHz. If you are lucky and hear them calling CQ just remember to activate your rigs repeater shift to ensure you reply on the correct frequency. When the astronauts put out a CQ call they also use 145.800 MHz FM but operate “split” listening for replies 600 kHz lower on 145.200 MHz. In recent years a number of UK schools have made contact with the space station thanks to volunteers from AMSAT-UK. These educational contacts enable students to communicate directly via Amateur Radio with the Astronauts and ask them questions. The ISS amateur radio station is used for school contacts. You can check the current mode of operation on the AMSAT Satellite Status page. The aim to start with is simply to listen to the sounds from the satellite. (Note: Packet digipeater is no longer active)Īstronaut Susan Helms KC7NHZ having a contact Voice and SSTV transmissions take place on 145.800 MHz FM, the AX.25 packet may be heard on 145.825 MHz FM. It can act as an AX.25 APRS Packet Repeater, voice repeater or transmit Slow Scan Television (SSTV) pictures. Much of the time the Space Station equipment operates in “automatic mode”. R4UAB WebSDR when ISS is over Russia /Ĭheck the N2YO site to see when the ISS is in range.Farnham WebSDR when ISS is in range of London.Select a Frequency of 145800.0 kHz and Mode FM: If you don’t have an amateur radio receiver you can still listen to the ISS by using an Online Radio, also known as a WebSDR. Hand-held rigs all seem to have a single wide filter fitted as standard. Most rigs can be switched been wide and narrow deviation filters so select the wider deviation. In the UK we use narrow 2.5 kHz deviation FM but the ISS transmits using the wider 5 kHz deviation used in much of the world. You can receive the ISS outdoors using a 144 MHz hand-held with its helical antenna but a 1/4 wave whip will give far better results. Large 144 MHz colinears are not as good because the radiation pattern is concentrated at the horizon while the ISS is above 15 degrees elevation for most of a pass. A ¼ wave ground plane has a high angle of radiation and works well. As far as the antenna is concerned the simpler the better. Almost any 144 MHz FM rig will receive the ISS, you can even use a general coverage VHF scanner with an external antenna.
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