Ok I understand, so you have not checked the weight (or the autodetect feature) yourself - then I understand. I can tell you the actual weight of the units are what I said in my last post = 13.5 g. If your data is quoted from Great Planes website (the Futaba north america distributor) - then they have written the wrong info. We are the Scandinavian Futaba distriubutor and I messured them myself and my info is 100% correct as I put them on my scale today.

I can also assure you that ALL R603FF, first generation R603FS (without external antenna & blue decal), R603FS with internal and external antenna (as they are now) with blue or orange decal all are autodetect PPM/HRS. Do note, it cant be autodetect PCM as FASST does not work on PCM. If you have any other info then thats simply not the correct info.

http://www.futaba-rc.com -> This is the North America distributors Futaba website = Great Planes.

Check this page:
http://2.4gigahertz.com/receivers/index.html

There you see that Great Planes says that the R603FF receiver weights about 13 g. But do note - that is not the R603FS receiver, the R603FF has no internal antenna = no dual diversity = thats why its lighter then R603FS.

This is Futaba's own website (as in Futaba Japan):
http://www.rc.futaba.co.jp/hobby_en/index.cfm