Please suggest me some solution for narrow band.
I had an idea: use 1.000 GHz oscillator, find 5th harmonic and mix it with 5.abc GHz LO, extract "abc" freq offsetm then do tuning for "abc". But i read about harmonics, it is somewhat difficult to produce predictable results, especially for higher harmonics. I very like 5GHz fet oscillator, it is simple and low power/power consumption, but frequency changes all the time and never stops! I thinked about doubling, quadrupling, etc, but it needs filtering and amplification few times.
Also looked at some wifi chips, but power consumption and radiation is more than i need (3v 100mA).