Bingo! The 3PMX came with the 603FF The 604FS comes with the 4PK. The one I bought included 2 receivers. The 3PMX seems to work fine in the PP mode with non digital servos and the 603FF- but if the dual antenna 604FS is a better receiver I'd rather use it- just can't seem to find any info. on compatability.R604FS is 4 channel receiver for the 4PK & 4PKS.
Not sure if it will work with a 3 channel transmitter.
Craig, Think I'll do just as you suggested. Don't want to fix anything thats not broken or damage a $100.00 receiver.If you do a search you will find that many use the 603FF with great results. The 603FS and 604FS are in theory better because of the second antenna.... If you are concerned run the FF with the antenna out of the radio box. I'm pretty sure the 604FS will not work with your 3 channel radio, but you surely could give it a try.
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