hello... wondering if you guys can help with this... i have an old Airtronics Radio Infinity 600 Series/Airtronics 92765 Receiver and about a month ago i had a crash and wrecked the receiver. i just purchased a new hitec shift selectable 7ch. supreme receiver, plugged in my crystal and i can't get it to work? does anyone have some suggestions i should try? i was told this receiver would do the job.!??
thanks

Make sure your jumper is set to negative shift (JR/airtronics). The instructions show you how to do this!

You did order the correct crystal for it, didn't you? Also, if your transmitter is really that old, it could be that they are incompatible with each other.

yeah, i've checked... it's actually Positive for AirT. i just changed the jumper over from factory shipping(which is hitec).

i'm using the original crystal ch. 21... i need to replace that as well?

Yes, the crystal out of your old rx will not work. You need to order a crystal specifically for the hitec. Get on towerhobbies and find the rx that you bought, and order the crystal to match. I'm sure it's a dual conversion, but make sure first! Or, go to the LHS and do the same!

OK, thanks for the beta on that! I will see what i can find up here in canada!!

In Canada try Great Hobbies. Good pricing and customer service. Check link below.
http://www.greathobbies.com/

OK... i picked up the right crystal for this receiver and it STILL doesn't work!! the server does move a little when it's first turned on but nothing else! any ideas at all on this!
thanks

Is your luck such that the crash would have broken the transmitter?

But seriously maybe the transmitter broke first causing the crash. There is not enough information since you said nothing about the cause of the crash.

Bill

no, the crash was caused by me! no fault of the radio unfortunately! this is a rather old Airtronics so maybe that has something to do with it??

As I recall, "old" Airtronics radio systems have the servo (not server) wires set up differently from Hitec, JR or Futaba.

If you're using old Airtronics servos, the system will probably not work.

Hitec, JR and Futaba servos have the servo wires arranged at the plug as follows:

Black on one side (ground), Red in the middle (Battery Positive) and white, yellow or orange on the other side (receiver signal.

Older Airtronics are definitely different. Airtronics experts, Please jump in here.

Ok, I fly nothing but Airtronics. Yes, the wiring on the servos are different. You can use any brand of servos with any brand of receiver just as long as you get the wiring correct on the servos. Please see the attached diagram for wiring on each type of radio.

As far as the older Airtronics. There should be no reason why it shouldn't work. I've got 3 of the older Airtronics radios and they work great.

Hope this helps

Ken

My concern would be if you plugged Airtronics servos into a Hitec receiver, bad things may happen, the least of which would be they don't work.

Swixtt: are you using Airtronics servos? If so, that is the problem with your system

Also wanted to let you know of another great hobby shop in canada www.hobbywholesale.com they are out of Edmonton and have great shipping rates and very competitive prices. If you order is enough money they will waive the shipping.

Flyboy76

Yes, i have old servos that came from another system. they aren't even airtronics servos... we converted them over to Airtronics wiring and they worked just fine. So when i got this new HiTec Receiver i bought 4 converter z style plugs that change the wiring over to z style of plug which that receiver needs to have.
i can't think of anything else to try... i've tried all different servos,etc. do i have to reset the Transmitter back to factory or anything? i've made sure the jumper is set to Airtronics on the receiever. hmmmm... i was told by the hobby shop too that it would work? any other ideas, thanks guys.

The only other think I can think of is that you may have actually got a bad receiver. It happens sometimes

Ken

i am going to double check the wiring diagram and check it against what i have. if it is z style than it won't work.... i'll have to change the z style plug to match the hitec wiring diagram? the physical z style might be the right plug but the wiring maybe isn't!? i will check!

OK... i figured it out! the wiring was fine so i looked into the Radio Configuration. I turned off PCM and now everything works very nicely!!! i am going to have to read up on the differences in the two types!
thanks all for your help!

Yep, you got it now.

FM vs PCM:

With FM, the data is put on the RF signal in a certain format. Most FM transmitters send out similar FM signals, except for the frequency shift, up or down. It's called PWM, or Pulse Width Modulation. The width of each servo signal varies accordingly with the position of the appropriate transmitter stick.

With PCM. the transmitter is still transmitting using an FM type modulation, but the data being added to the RF is coded differently, Pulse Code Modulation. Basically a Digital data stream. I don't know what it looks like. You don't need to know either.

You can't interchange FM equipment with PCM equipment, and even most PCM systems are not compatible with other PCM systems. Some transmitters, like yours probably, has the ability to select FM or PCM. Receivers don't have that capability.

(Corrections will be gratefully appreciated)

Now, stop typing and go out and fly!

thanks for the info on the PCM versus FM type receivers! now i can get this working in another plane and get some flying in before winter comes!!

Hi,

I have a Micro 535 Hitec receiver with negative shift (JR) and I was wondering if it is possible to convert it to positive shift.
Thanks

If it says JR on it, then it is already positive shift. I am unfamiliar with the 535, but the closest thing I could find online was the 555, which is not shift selectable. Just look at the rx. If it has a little jumper wire at the bottom, then it is shift selectable. If not, then it is not possible to change shifts with this rx.

Marco the 535 is the RCD predesessor to the 555 and no longfer in production. As 2slow indicated it is not shift selectable and if it is marked JR or Airt it is positive shift not negative. he only thing you could try is factory service however I have doubts they will do it either.

Another alternative is to pull a trade with someone else with the wrong Rx, people buy the wrong ones all the time. That is the down side to internet shopping and places like Ebay.

John

Ok!

Thanks for the answers... I imagine that it wasn't possible but I decided to ask... It came with a JR f400 that I'm not using anymore...

Thank you guys..