in reply to tomcatguy, ie. difference in type of reciever's....
the packaging that came with your particular plane should have that information some where on the outside of the package or in the literature that came with it......the biggest difference between a parkflyer rx and a full range rx is, some park flyers are so small and hard to see that they were meant to fly kinda close to you, usually within a couple of hundred feet with the factory installed rx......most full range rx's are purchased seperately and are exactly as stated, "full range".....they are usually tiny and light but are designed a little better and cost a bit more.....i fly HI-TEC ELECTRON 6 and JR R610UL RX'S with my JR X6102 Computer radio......i like that this radio has 10 model memory and i don't have to lug a bunch of radios to my club field like the "old day's"......the hi-tec electron 6 recievers are nothing short of great, i have one in my SIG E-FORCE 3D'er and when new, i was not familiar with it's range.....being very careful, i took it further and further away to test it's range and found that i could lose sight of my plane before i ever lost my signal or went out of range......HI-TEC has been around forever and has a very good reputation, just ask anybody.....also, HI-TEC RX's will work with JR or FUTABA as long as you buy the right crystal.....on the otherhand, the JR R610UL RX's are alot smaller and "lighter" and considered "full range", but will only work with JR radio's.....i don't own any spektrum products....i think you do and i think they're all 2.4.....regarding the range of your RX's, if you can't find any info. on or in the box, check the manufacturer's website.....the manufacturer's website usually offers more information than the packaging because, it would cost too much to print on every box???....you could also post right here what equipment your running and in all likelyhood, somebody has the information you need???....that's what these forum's are for, right.....like i said, i don't own any SPEKTRUM, my post was more to clarify the difference between short-range and full-range.....i hope this help's???.....