Quote:
Originally Posted by bojan
Alex,
Someone made the calculation of thrust produced by parabolic antenna, fed with the same power (I forgot where I saw this, sorry)
The measured efficiency of this thing (Thrust/kW) is about 1/10 of much simpler and common antenna-transmitter system.
I mentioned elsewhere in this forum, if this effect is really real, it must have been noticed when operating MW (and this is quite moderate output for military radars, not to mention radars used in studies of planets and asteroids) radar equipment.. and it wasn't, never as far as I am aware.
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I would note a major difference there (As an ex RADAR tech) Unless we are talking about something space based where effects might stack up, RADAR antennas are generally quite robust and are often quite large and have to withstand large wind loads. Similarly, waveguides are generally quite rigid and are bolted to support structures so I would not expect to see effects that would be measured probably in millinewtons at most being noticed in a RADAR system.