Guys, don't confuse pure single conversion (no filtering) with what JR calls "single conversion". Dual Conversion is a filtering technique used to clean the signal. JR opted for a different filtering technique they refer to as ABC&W that they believe is superior to dual conversion. Therefore when you read "single conversion" on the JR RX it doesn't mean they have no filtering.

This begs the question of why does JR have dual conversion RX's. From what I hear it's because some people simply won't buy an RX that isn't dual conversion so JR provides that as an option so as not to loose market share (remember this is coming from someone that has no connection with JR so it's conjecture, but probably not far from the truth).

Most JR users swear by ABC&W filtering and are adamant that it makes no sense to fly the JR dual conversion RX's. However, on two occasions I have gotten minor glitches (lockouts) using the JR ABC&W PCM and solved the problem changing to the JR Dual Conversion PCM RX. The latest case was with the JR 770 slim line RX in my electric pattern plane (electric is know for causing interference). I got numerous short lockouts on turn around maneuvers. When I changed to the JR 945 Dual Conversion PCM RX the problem went away. However, later to make weight I tried the JR 790 slim line Synth RX (also ABC&W) and I've been glitch free for well over 100 flights. So maybe the problem was with the JR 770 design, that particular 770 or even the crystal, who knows.

Ozzieflier, am I understanding correctly that you used the same physical RX in both pattern planes that crashed?

Keith Black