I recently increased the height of the tower I shunt feed for 160 to 105'. Presently no antennas on the top only a bit of mast out the top. The 2:1 BW is quite narrow so I decided to try to motorize one of the caps in the omega match. First I used large air variables to get a match. Then measured and found I had a vacuum variable that could be used which was great because they take more "rotation" of the shaft to change capacitance vs the air variables.
I was trying to decide what motor to use and was digging around "stuff" I had. I found an old broken car power antenna. Opening it I found it had a quite large motor, 12V of course. I used the large "wheel" that the plastic cable to raise and lower the mast was wound on to adapt to the capacitor. Using the large wheel gave me a slower rotation which turned out to be the perfect speed. Its fast but again, with the vacuum variable it takes more movement so it all turned out well. And, best part, the motor and gearing was FREE! 73 Ron N4XD _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
