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In this case it requires a 400W transmitter and an extremely large parabolic antenna. Probably not something they'll have at the local hackerspace. Satellites

• jacquesm 12y ago
  The 400W transmitter is doable, the large parabolic antenna would be a bit harder to hide. Though, as you up the power you can use a smaller antenna. The giveaway then becomes fried birds falling out of the sky.
  • Already__Taken 12y ago
    You also wouldn't have the hardest time finding where a 400W+ signal is coming from.
    • jacquesm 12y ago
      You're going 'up' with a highly directional antenna, and you're going to be transmitting very short bursts. The biggest risk will be the lobes projecting from the antenna some of those will be pointing back at the planet instead of into space. Airtraffic will have the biggest risk of interference (also because the frequency band is close). So kidding aside you will need to make very certain that (1) you have the right permits and (2) that your gear is not inadvertently sending out a dirty signal. The narrower the better. Better start shopping for a second hand spectrum analyzer ;)
  • Serow225 12y ago
    It's not even building a big dish that's the problem, it's that it has to be pointed extremely accurately and stably, and preferably able to track..t
  • snops 12y ago
    Half of the problem is recieving signals back, as you can't just turn up the power on the satellite. I suppose if you knew exactly what command to send, and there was no form of handshaking this might not be a problem.