Ryan,

Okay, you have one 9C on channel 38 and a 4FM on channel 47? Is this correct?
And you are getting the same range problem with BOTH radios, and have done the following:

"changed out the receiver, switch, and made sure the battery was charged well, but the same problem persisted. The next day, another flyer put his crystal which was 47 in my receiver and I used his transmitter with no trouble, so I think that the airborne pack is okay. "

I would suspect the receiver crystal in the 4FM if you had not stated that BOTH radios (on different channels) are showing the same problems.

I must admit that I am at a loss on this, the only thing that I can think of if the information that I have is correct, is that there may be interference from soemthing new in your area. The statement that the 4FM worked fine for you for years, and the fact that the channel 38 9C is also affected makes me suspect this.

Also, are you using both these systems with separate planes? I am wondering how you have your antenna run, and when you used the other gentleman's radio and everything worked fine, were you using your plane or the other gentleman's plane?

I hope you find this information helpful. Should you have any further questions or concerns, please do not hesitate to contact us at 217-398-8970 for Support, 217-398-0007 for Service or via fax at 217-398-7721 or by email at [email protected].

Sincerely,
Krysta
Lead Futaba Customer Service and Programming Technician
Also you may want to check our Website at (http://www.futaba-rc.com)