Andy,
No, not dual conversion receivers. But dual receivers, a 'two-in-one' kinda thing. Has to do with the polarity of received signals and how the strength of them varies and no missed signals. (UHF signal polarity can make for lots of variations in signal strength and missed signals, short ranges, etc.) One of the hobby sites has the 6 channel going for $200/ea, but for 'park flyers'. Didn't check the price on the 3 channel one. I've heard of someone on these forums getting one and plan to let him 'beta' test the system - LOL. If it works okay for him, I'm gonna change my Christmas 'wish list' !
- 'Doc