[Doc]

FWIW

Single conversion receivers are slightly less 'selective' than a dual conversion receiver. Which doesn't make a lot of difference usually (only in the cost of construction). 'Selectivity' deals with 'picking' a particular signal from several in a fairly narrow range of frequencies (adjacent channel rejection). The more selectivity there is, the 'better' the receiver is at 'hearing' the desired signal from a glob of them in a band. Most modern single conversion receivers are sensitive and selective enough to work just fine. If there happens to be a 'dirty', or wider than normal transmitter being used nearby, you may have problems (actually, the one with the 'dirty' transmitter is the one with the problem). As long as the difference in price isn't much, go with the dual conversion stuff, it's just "more better"...
- 'Doc

[Watercadet]

The only DC rx I can think of it the Hitec DCX. It is arround $50, requires a DC crystal and is somewhat larger than other Hitec rx that are just as "clear." I have the Hitec rx with the built in failsafe and it is just awesome.
Adam

[Watercadet]

Thanks for the clairification on terms Doc-
Adam

[hederjr]

Yeah, what he said x2!

[Doubledog]

I'm learning. Thats a good thing. LOL.
& thanks for taking time to explain it.

[hederjr]

Here is what I found in a back issue of RCBM April 04. Two adjustable servo fail safes. One by futaba #fp-fsu1 which can be purchased through Marine Specialties (marinespeacialties.com) #rs-fs1 for $59.75 . the second by RAM (Radio controled models) #ram62 $29.95 ramrcandramtrack.com .