Home › Forums › temp › range 2 expect w/shoestringbudget stereo AM ’15 at my loc? › Directional array
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I think the biggest problem with using part 15 transmitters for a directional array will be the phasing. You’re not going to get the response or coverage you want by using multiple radiators with separate transmitters. There’s just no way I can think of to control the phase of the subsequent transmitters. Commercial directional stations generally use one transmitter and a phasing array for each additional tower (which may consist of nothing more than a specific length of coax going to the next tower and that’s going to put you over part 15 rules on antenna length). That way they have control of the directional pattern. For instance if your second antenna was 180 degrees out of phase with your first antenna’s signal when it arrived at your second antenna there would be little or no signal transmitted in the direction of the line of antennas. It is complicated, but unless you have a way to reliably sync your multiple transmitters I don’t think you will end up with a consistent coverage area. You might try a passive elements and get some directional results, but they probably won’t be impressive.