I am not transmitting narrowband on 24GHz yet. I have enough equipment to do so but I have to do a lot of work with it to be able to decide how to best make use of it. I have collected a Gunn osc based system build by Microwave Radio Corp and a transistorised multiplier and amplifier stage, right to output, 'Microstar' system manufactured by Harris Microwave. This Harris system looks to probably be the best one to trial first, once I have mastered power supplies for it. Click here for a circuit diag that I drew out for the transmitter stage. Below is a pic I took of the TX board.