David -

For a computer application (HamRadio Deluxe) to have “remote control” of another device ... it requires a communication path (using standards like serial, RS-232 or RS-422, for distance) and an intelligence (u-Processor) within device to interpret the communications and perform desired actions. — The Channel Master 9521(A) TV antenna rotator is a simple 50+ year 3-wire motor control design, updated in past decade with “Bling” (7-segment display and IR control) controller using a u-processor, to appear “modern” to non-STEM consumers. https://support.channelmaster.com/hc/en-us/articles/200382985-Rotator-System...

In addition, there is No True BRAKE in these inexpensive designs (reason CDE created the Ham-series of azimuth rotators in 1957) The designs are virtually the same as early 1950s TV rotators in post-WW2 America.

Why is that an important? NO positive feedback between actual direction of outside rotator and inside control box (subject to mis-alignments).

Adding Position Control to 3-wire Rotators (Radio Shack, Channel Master, NTE) by Doug Braun, NA1DB (amsat-bb, circa 2001) http://www.amsat.org/amsat/archive/amsat-bb/200110/msg00027.html

No schematic diagram provided, BUT YouTube disassemble videos exist. https://youtu.be/KhvxsMiObTY

Building a PIC rotator controller, NA1DB http://www.dougbraun.com/pix/rotor_controller/index.html

greg, w9gb

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