I use a JR transmitter also. Assuming you have the JR cable that connects to a printer port as I do. I found that the cable works a lot better after I went into the BIOS of the computer and set the printer port, LPT1, to SPP and not ECP. Hope this helps. (Mine really didn't work at all until I did this and now it works well.) There are differences in Computers, we know this, so I would think this should be checked by everyone with this cable setup. Who knows, it might make someones FMS sim quit working. Hope this helps, but there is no guarantees.