I bought this tuner to use with my 706 originally with the cable and it works flawlessly. I got this Yaesu 857d and the cable and it does not work. It will try to turn but it doesn't work right and a match is never obtained. If I go into the radio and turn the power down very low and remove the tuning cable I can manually tube it if the power is very low on the radio. I notice the y100 version uses cat cables not the acc plug. I dont think the radio goes into low power tune mode. I've read the entire 857d manual and the ldg manual I must be missing something. It appears all the settings for tuner in the radio are for one of the serial ports not the ACC port I've tried them anyways just to see what it would do and I set the radio to tuner. I had a similar problem with the new 891 but it would actually get a match but it didn't do any automatic push to talk tuning or anything like that. You had to control the tuner from the tuner button. It seems all the cable is doing is telling the radio to send a carrier but it's not sending a low carrier for tuning and the tuner cannot handle the power so it gets confused I guess. Does anyone know how to make this tuner work with this radio?