Dual Conversion Receiver
 

I have a Futaba T6XA radio and receiver on channel 48 that I am currently using in my trainer. I have since bought a new Futaba Dual Conversion receiver that I would like to put in another airplane. This receiver does not have a crystal installed. Where is the best place to buy crystals[:@]

RE: Dual Conversion Receiver
 

Any hobby shop can order them. (you did order the correct "High" or "Low" and RX for your frequency didn't you?)

Futaba ghas decided its cheaper to ship the RX's without the crystaland make you pay the $12 for the separate crystal. (same with a lot of other recievers..)

If you had ordered the Hobbico Command Reciever on the correct frequency... you would have saved appx $10 on the reciever... and the crystal would have been included (for a total of appx $22 savings... ) The Hobbico RX appears to be a relabeled Futaba... (I haven't opened the case of peeled the label... but the case appears to be out of the same mold as my Futaba RX.)

RE: Dual Conversion Receiver
 

the receiver I bought is a futaba FP-R127DF, 7 channel. Dual Conversion FM which is the same receiver that I have in my other airplane. This is a 72 MHz Aircraft use only transmitter with a 72.750 MHz crystal iinstalled.

Hope I havent messed up buyint this other receiver, help me on this one please

RE: Dual Conversion Receiver
 

The RX box should have a label that says "High band" or "Low Band" on it. You want high band. (48 is in the upper half.)

If it does not have the label... and you bought it used... you have a 60% chance of it working fine with the channel 48 crystal even if it was a low band RX. The difference between the 2 is a small adjustment of the tuning capacitor. ( someone with the right equipment could tune it dead-on frequency with the correct crystal.... usually they are off just a little bit.)

There should be nothing wrong witht he RX you bought... you just need a crystal. Next time... look at the options of other brand RX's. Plenty of them out there. Just verify its Futaba compatible, instead of JR compatible. (some makers make both... like FMA and GWS.)

RE: Dual Conversion Receiver
 

mod1cat,
It appears that you bought this used, do you know what channel the receiver WAS on? As FH said, Futaba makes receivers in two bands, low and high. I believe the low bands Rx's are channels 11 through 39, high band 40 through 60. Therefore you'd want a FP-R127DF "high band" receiver. If it's low band then it's questionable whether it will work properly or not.

Futaba is the ONLY manufacturer that has chosen to divide the 72 mHZ frequencies into high and low bands. Why....?? Who knows.
Dennis-

RE: Dual Conversion Receiver
 

why divide it into high and low?

Maybe they found a technical reason... that makes it more reliable as far as tuning accuracy.

Maybe they figure by dividing them... they won't have quite as much TX crystal swapping going on. (since only half the frequencies would be applicable to any given RX... And FCC says don't swap TX chrystals...)

Maybe they just figured that by labeling them that way... they might sell more receivers...

No idea why they did it. the Futaba rep may or may not know either...:eek:

've never SEEN a problem from putting a high band crystal in a low band RX. I've not heard of problems from it. But I've not heard of people messing with it either.

I have heard of serious problems from putting a Hitech crystal in a Futaba RX... or a Futaba crystal in a Hitech RX (they fit...:eek: but have different multipliers so its definitely WAY out. Range check of... may as well have the TX off... it don't work.)

RE: Dual Conversion Receiver
 

I have also wondered when you read Futaba's web site advertisment on the flight packs with reciever and servos, it only comes in low band and not high band.

RE: Dual Conversion Receiver
 

By the way Low band is up to 35. High band is 36 and up. I used to think the cut off was 39. I got called out on it. I looked it up on Futaba's web site. Appearantly I was wrong. Just be sure you have the correct reciever for your channel and proper chrystal.

Mark Shuman

RE: Dual Conversion Receiver
 

It is the same as the futaba 127, I have one. The fcc label on the back of the hobbico rx is exactly the same as the one on the futaba rx.