I rencently attempted to switch over to 6 meters. Unforntunately, I am unable to obtain a proper range check on my equipment. I have a Fut 9CAP with a Channel 05 TX module and a 127 RX with the channel 05 crystal. I have tried two different receivers and two different crystals in the plane and still no good. I switch back to 72 mHz and all is well. I am guessing that the TX module is bad, is this a good assumption?

Victor

Did you purchase a 50 MHz receiver or only change the crystal? You cannot change from 72 MHz to 50 MHz in receivers by simply changing the crystal. You need an entirely new receiver intended for use on 50 MHz.

If you have a 50 MHz receiver to go with your 9C with 50 MHz transmitter module, then one or the other needs to be checked for proper operation and tuning.

One other thing to consider is how the receivers are mounted in your airplane. Do you get a good range check if the receiver's out of the model and about 3 feet off the ground with the receiver antenna vertical? Are you trying to use one of the after-market mini receiver whip antennas? Are you using the standard transmitter antenna? Are you in a "clean" RF environment...that is, no other 50 MHz radio traffic in your area...no repeaters, active HAM use? The RC channels on the Amateur Radio channels are not exclusive RC channels, but are also used for other purposes by amateur operators. There's just a general agreement that they will keep off the RC channels to make things easier, but there is no regulation to that effect.

If you can get a good range check when the receiver's not in the model with unaltered transmitter and receiver antennas, then your installation would be suspect.

If you can't get a good range check with the equipment outside of the model, then it needs to come into the service department to see what might be wrong.

Bax,

First, yes I did use 50mhz receivers. Stock rx antenna, stock TX antenna standard installation in a H9 Stick. Set up is fine on 72, but the new 50 module setup won't give me a good check no matter what combo rx/crystal i use. (have two 50 mhz receivers and two crystals on channel 05) That is why i think it might be the TX module.


Tried them in and out of the plane in what I believe to be a clean rf environment. I get the same results at the field, in my yard and in my basement (lights off to guard against rf interference). Lots of twitching of the control surfaces.

I am going to try a new TX module and see how that works.

Thanks for your response.

Victor

We'll be glad to examine your items to see what might be wrong. You're right, if you have known, good receivers, then the transmitter module may be suspect. You'd only need to send the module to us, and not the entire transmitter, since you mentioned that it's working well with a 72 MHz module.

I have the Futaba 6EXA and I was wondering what the range check distance should be?

I have installed onboard glow on a war bird and when I do the range check currently I am getting about 35 yards before it goes nuts. I have not tried it yet with the motor running.

Thanks in advance for any help.