[jbri]

It's the responsibility of the receiver to ignore signals transmitted at appropriate power levels, yes.

The receiver is not required to be overengineered to cope with transmissions vastly more powerful than expected - that's why limits on broadcast power exist in the first place.

[marshray]

OK I see it now. It looks like everything in that adjacent band had previously been designated space-to-earth.

I suppose it would be reasonable for an engineer to assume a receiver is not going to end up within a few KM of a 15 KW transmitter at those frequencies.

[X-Istence]

At high power you can overpower adjacent frequencies wether you have good band filtering on it or not. For example a 2 Watt FM transmitter at 100 Mhz can easily overpower radio's tuned to 95 Mhz just because of its power, even with the appropriate filtering.

[marshray]

The internationally-agreed upon plan for the adjacent band was to have all the transmitters in orbit and all the receivers on the ground. So I don't think a 2W transmitter in orbit is going to overpower receivers in a different band.

40,000 of 15KW transmitters on the ground may be another matter.