When they say it takes about 5-6 mins to send radio signal back to earth, what kind radio signal are they talking about? Not FM/AM signal right?
Wow cool contraptions. Thanks. I'm try to set one up.NASA uses microwave C band and X band frequencies to communicate with the probes. Uplink is in C band about in 7.8 GHz range, and downlink is 8.4 GHz.
Microwaves travel alot better in space, require less power, and more data can be sent than on lower frequency bands.
I don't remember what modulation Nasa uses, but it's probably QAM because you can cram alot of data.
If interested, you can build your own receiver to pick up signal from Mars probes, no kidding.
hope that helps