This is a little bit on some Industrial R/C equipment I repair from time to time. These systems are used to guide and control concrete pumping trucks, though I have have worked on some that remotely controlled cranes, and even one skid-steer. There's practically no shops that do this, so it has become a bit of a niche repair operation in my workshop. I've worked on various models operating on 370mhz, 900 mhz, 2.4ghz, and even 10ghz. This particular system was made by Omnex, and operated on 2.4 ghz. I questioned the previous history of it, as it seemed to have maybe been used as a parts unit...every aspect of it had problems. The portable unit had wires cut, the internal antenna was missing and wiring damaged, and the TX final output device was toast. In the base station (the fixed unit that is installed on the concrete truck), the proportional module that controls the arm had to blown modules, and the receive module has a bad 1st rf amp (lightning strike, maybe?). No matter, I repaired it all, gave it a range test, and it's back on the job site and controlling a remote controlled concrete pumping truck :-)
Dave WB4IUY
