# If the desired frequency is known, can an antenna tuner tune its 'x' different dimensions sequentially for maximum gain?

Assume I have rotators that are able to move an antenna in different dimensions. For example, on the x, y, and z axis. I want to automatically move the antenna to its optimal physical orientation, using a home-made system. The system knows the frequency we want to turn to, so it shouldn't get confused by stronger signals on other frequencies.

I want to know if sequentially tuning each axis in this way will result in the most efficient orientation of the antenna. For example, tune the 'x' axis until the signal strength is the highest on that axis, then tune subsequent axis the same way. Each axis is only tuned once.

• Do you mean rotator? A tuner in any usual sense does not change the antenna orientation. Sep 4, 2014 at 18:01
• In that case, a rotator, one that can move in different axis. Sep 4, 2014 at 18:37
• Can you edit the question to make more sense? If you are talking about a rotator, I'm not sure why the frequency is relevant. Sep 4, 2014 at 21:43
• I restated the question to hopefully make more sense. Sep 4, 2014 at 22:40

Radio propagation is complex. In particular, a desired signal may be received by multiple paths. That means there are multiple directions in which the antenna may point and get improved reception. Some paths are better than others, so there's probably just one direction which is best, but without trying all the directions, you can't know for sure if you've found the absolute best direction, or just a local peak of a sub-optimal path.

Fortunately, it's usually pretty easy to try all the directions, and in very many situations there may not be significant paths in significantly different directions from the best one. Thus the simple answer, "yes".

There's also the additional problem that in some situations (HF, especially) the path is constantly changing. What the best path is now is different from what it will be in 30 seconds, so the best we can manage with a mechanically rotated antenna is to orient it in the direction that's pretty good most of the time.

Further complicating the issue is that orienting the antenna for maximum received signal power is not necessarily optimal for communication. What we are actually trying to optimize is the signal-to-noise ratio, so we also want to minimize received noise. That is, in some situations it may be more advantageous to aim a null at the noise, rather than aim a peak at the signal.