As a satellite such as the International Space Station (ISS) orbits the Earth, the orientation of its transmitting antenna changes with respect to the Earth. It could have an orientation anywhere from horizontal to vertical. To get a good signal, the Earth-based receiving antenna must match the orientation of the ISS’s transmitting antenna, especially when using only a hand-held tranceiver with stock antenna. An antenna with a pair of elements placed at right angles with each other (such as a cross Yagi or a cross dipole) is best suited for satellite work, because elements at right angles can receive signals from both horizontally and vertically-oriented antennas. In this video, I have demonstrated this effect and shown how changes in antenna orientation affects the strength of the signal received.
To learn more about receiving SSTV images from the ISS, click here. To learn more about my progress in amateur radio, click here.
In the previous post, I have mentioned that I am currently engaged in amateur radio activities, particularly, satellite communications. At the moment, I am only receiving transmissions from the International Space Station (ISS). Shown below is the gear I use to send and receive SSTV images.
Equipment for Sending and Receiving SSTV Images
Transmitter (Motorola CP1660) + DIY connector (smart phone’s line out to transmitter’s microphone in) + encoder (smart phone with SSTV Encoder app)
Receiver (Motorola CP1660) + DIY connector (transmitter’s line out to smart phone’s microphone in) + decoder (smart phone with Robot 36 app)
To learn more about my progress in amateur radio, click here.