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8U Radio System FAQ

General Questions

  1. Training Information

  2. I want to use my radio with a student's radio. How can I let the student use all of the programming, mixes, etc that my radio has to offer?

  3. I broke a switch on my radio. The radio is out of warranty and I am comfortable servicing my own equipment. Can I just purchase replacement switches?

  4. I am thinking of purchasing an aftermarket Tx module for my module radio. Is this OK to do? Does this affect my warranty?

  5. If I remove my transmitter battery for cycling, will I lose my model memories? If not, how is this memory protected?

  6. What is 'battery fail-safe'? What does this mean? How does it work?

  7. I own a 6X (or 8U or 9Z) airplane radio. I want to use it with helicopters. How do I get it changed?

  8. Why are there different modules for the 9Z and the 8U? Can I use my 9Z module in my 8?

  9. Is there any risk to using cellular phones in close proximity with my radio?

  10. What receivers can I use with my transmitter other than the model which shipped with the radio?

  11. What are the differences between an 8U and an 8U super?

  12. What's new with the Super?

  13. If my receiver is PCM, do I need a PCM module or PCM crystal for my transmitter? Do I need PCM crystals for it?

  14. How do I change this radio from FM to PCM or vice versa?

  15. Information on changing bands from 72 to 75, and others.

  16. Resetting countdown timer when changing models?

  17. How do I use 8 servos with the R148DF/DP receivers?

  18. When I am using my radio for programming, setup within my house, experimenting, etc, is there anything special I should do?

  19. My CAMPac seems to be behaving strangely. I can copy models within my transmitter's regular memory fine, but if I try to copy to the CAMPac, the model name carries over but some other functions do not. What's wrong?

  20. I own an 8U and an 8U Super. I want to use the CAMPac to move models from the 8U to the Super. How can I do this?

  21. The transmitter beeps twice on boot up and the light under TIM blinks regularly. Is this normal?

  22. How do I store the trims after a flight?

  23. My transmitter occasionally gives a very long beep, not associated with my timer or anything. What does this mean?

  24. When I turn on my radio, I get a warning which says (throttle cut, idle down, snap roll, air brake, butterfly, inverted, throttle hold, or idle up). I've tried moving every switch on the radio, and I can change the error but not get rid of it. I cannot operate my radio. What do I do?

  25. My ailerons work fine, but when I turn the flap knob they both move as ailerons. What's wrong?

  26. I think the preset mixes and things in my 8U are really nice! But I want to operate my (name function here, for example, flaps), from a switch not the knob on the front of the transmitter. How can I do that?

  27. I have mixed channel 6, 7 or 8 to another function and do not want the knobs to affect these channels any longer, OR I want to be able to turn this knob on and off in flight. How can I deactivate the knob?

  28. I want to use twin aileron servos (flaperons) on my 8U Super with a 5 channel receiver, so my second servo must be plugged into channel 5 not channel 6. How do I do that?

  29. I was using my radio, and suddenly my throttle servo went to idle. If I pull my throttle stick all the way back and then move it again, it works for a while and does it again. Am I doing something wrong?

  30. My radio's sticks don't operate right. For example, the throttle and elevator are crossed, or the rudder and aileron are crossed. What's wrong? What do I do?

  31. Can I use the PA2 in conjunction with fail-safe on my PCM transmitter to help protect my airplane in the event of interference?

  32. Can I use my computer radio in a different MODE (ie. mode 1)?

  33. What does V1 or V2 mean on my 8U display when I have a CAMPac in place?

  34. Why would I want separate trims in my 3 flight modes?

  35. We have a very short runway at our field, how do I set my plane up to cut down on landing distance?

  36. When I am using my radio for programming, setup within my house, experimenting, etc, is there anything special I should do?

  37. Can I purchase a flight pack in the PCM mode?

  38. Can I use synthesized equipment with this radio?

  39. I did not find the answer to my question here. How do I get further assistance?

Airplane Programming

  1. What is the easiest way to do twin elevator servos?

  2. How do I get aileron differential WITH flaperons?

  3. I am trying to set up a flap-to-elevator mix. Can you please help?

  4. Can I assign flaperons, elevons, or ailevators to a switch so they're only functional sometimes (I want to use them for special stunts but not the rest of the time)?

  5. I want to set up two servos to operate a single surface, but not use a preset feature like flaperons or ailevators to do so. How can I do this with a mix?

  6. When using the elevon feature of my computer radio, I give elevator input and the surfaces move like ailerons. When I give aileron input they move like elevators. What's wrong?

  7. When using a 2-servo function like Ailevator with digital servos, I notice a small lag in the response time of the second servo. How can I fix this?

  8. I am a little confused with how to set up the flaperons on my 8U so they will act as both flaps and ailerons. Can you explain how to set it up for both a 5-channel and a 7- or 8-channel receiver?

  9. I want to create a mix which is only active if my throttle is above a certain point. For example, I only want my smoke to come on if my throttle is above 1/2 to avoid killing the engine. How can I do this?

  10. How can I vary my onboard glow with throttle position?

  11. How do I keep from overdriving my throttle servo when using an elevator-to-throttle or aileron-to-throttle mix?

  12. How can I set up a twin which uses rudder-to-throttle mixing to have throttle aid water steering and slow speed steering? The rudder-to-throttle mixing should not function when above 1/2 throttle. I also want to have one engine only options on throttle.

  13. How can I have my gear doors open and close automatically before/after my gear and also move more slowly, more scale?

  14. How can I set up a 6-servo glider to use outer ailerons, inner ailerons and flaps or spoilers?

  15. Can you give me some guidelines on how to set up a complex 7-servo aerobatic model with separate flap and aileron servos?

  16. I am setting up a twin engined-model and want to be able to command the engines separately at certain times. Specifically, I always want the engines to respond only to the throttle stick (never any knobs or other items), and I want the left engine to operate alone if the C switch is in the up position with the right engine at idle; the left and right engines operating together in the C center position, and the right engine to operate alone in the C down position, with the left engine at idle. Can I do this?

  17. What are twin aileron servos and flaperons? Are they beneficial?

  18. My airplane's electric motor runs in the wrong direction. What do I do?

  19. Can I use a gyro in an airplane? When is it a good idea?

  20. On the 351 gyro, can I use flaperons while in heading hold mode?

  21. I am setting up a Delta/Flying Wing plane with my 8UA/S and I am having problems getting the control surfaces to function correctly, can you explain any easy way to do this?

Helicopter Programming

  1. Turning gyro on/off with gear switch (for take offs/landings).

  2. How can I set up a 45-degree CCPM?

  3. How can I fly a non-CCPM heli on a 5-channel receiver?

  4. How do I set up CCPM on an 8U non-super?

  5. I am having problems with my 120 CCPM set up. All the servos seem to be going the right way, but my pitch is still backwards. What's wrong?

  6. If I use the offsets to set separate trims in my idle ups, how do I adjust those trims in flight?

  7. My throttle trim, throttle hold, or throttle curve functions seem to be working backward. For example, my trim only affects the high end not the low end. What's wrong?

  8. How do I set up a heading hold gyro on my 8U non-super or 8U Super?

  9. Can I fine tune my governor settings in flight? That is to say, adjust from say 1500 to 1525?

  10. My model is CCPM but one of the functions is backwards. For example, my elevator servo is forward on my swash plate, not aft, so the elevator function works backwars. How do I fix that?

  11. I'm fairly new to helicopters. How do I know what servos to use?

  12. I am new to helicopters and I see a lot of swash types to choose from. What do they mean and which one do I use? Also, what is eCCPM?

  13. I have my gyro mounted onto a graphite plate in my chopper and am seeing some slight drifting. Is there anything I can do about this?

  14. My model shows no wag in a hover, but after a pirouhette the tail wags briefly.

  15. What is the proper way to turn on my heli/aircraft, and then carry it out to the flight line?

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