[amsat-bb] help with yaesu 5500 rotator

Hello Amsat-ers

I am using an Yaesu 5500 rotator controlled by a Lab jack under Satpc32 v8.1. Intermittently the rotator stall under computer control. The LED on the lab jack indicate a signal to control the rotator to move but no movement. Terminating Satpc32 the rotator works normal. Suggestions??

Nick k6qxj