I have a little input...
I have never heard the burst of undecoded C4FM unintentionally. But if you set the B VFO on the same frequency (which only does FM) as A VFO you will hear DATA for a split second just before the B VFO mutes and Digital audio comes thru the A VFO.
The audio of System fusion is pretty good. Sounds even better with external speaker for mobile and speaker mic on portable.
Overall system fusion is about as close as you can get to commercial performance as far as air interface. Defenitly better in fringe areas than D-Star. But it is not up to par yet compared to D-Star as far networking repeaters. But I am told there are some things in the works so to speak on networking end of it.
Yaesu still has a way to go with the product, though. Luckily most of the added features and/or problems can be updated with simple firmware updates.
Rant: Why do Amateur radio manufactures insist that most portables and mobiles be as small as possible, thus leading to punny speakers, I will never know. LOL off Rant.
Thanks for the ON TOPIC and germane reply as opposed to others who feel the need to bash the OP for their selfish reasons.
There are a couple of Fusion repeaters in the Atlanta area, my understanding is they are on "perma loan" from Yaesu and are essentially beta testers, and under the beta testing program, are not authorized at this time to provide details of the system performance in blogs, YouTube videos, or web sites at this time.
I heard from one station in the Lakeland, FL area on NXDN worldwide that the repeaters emit a loud burst of C4FM when a subscriber unkeys. Having not actually heard the repeaters in my area as I don't personally own a Fusion subscriber radio, I am concerned about this.
One gripe I have is the lack of built in networking on the repeaters, like D-Star, you have to purchase a separate gateway/router. I guess this is where NXDN has a real advantage when it comes to networking infrastructure.
I do concur that the small size of the units is a complaint, while many people like small pocket sized radios, they usually suffer from ergonomic issues (cannot hit the buttons without fat fingering!), lacking audio volume, run hotter than a road flare on transmit, and until the advent of lithium ion batteries, had subpar battery life.
A good MEDIUM sized portable would be ideal, but my guess is in Asia where smaller is better in the electronics world, there isn't much desire to build big "Americanized" versions.
Thank you again for your relevant reply.