Thread: Transmitter help please !

Try another set of xtals, remove Rx from sub and try on bech just connected uo to servos. With RX in sub connect 1 channel at a time and see what happens.

I will give it a go. The odd thing is the servos still twitch when the main batteries arent connected. I am using futaba servo extensions, I was even considering the fact that they arent twisted to prevent interference.

I will definately try another set of crystals.

Paul

The transmitter and reciever came together. There both Robbe units, so I would hope they are compatible Think I will check with Robbe though all the same.

But I will check the crystals, I am not sure but I think there hitec crystals which I was told were compatible with Robbe handsets.

I have some different ones which I am going to try today.

Thanks

Paul

Originally Posted by Bunkerbarge

The crystals also have to be the same i.e. single conversion, AM/FM etc.

I think they are the problem from what you are saying.

Thanks Bunker, much appreciated. I have been looking through the literature that came with the handset, and on there website. I cant find much in the way of single conversion etc. AM FM isnt the problem, there both fm. And the crystals are all from FM sets.

But what you said about them not being from the same manufacturer was spot on. I have 5 sets of crystals, and I tried them all this afternoon. Only 2 sets were compatable with the Robbe transmitter and reciever !

So thanks for that, I will order some more tommorrow. Starting to think the interference is coming from one of the electrical systems, in particular the diving tanks.

More on that tommorrow, I have ran out of time tonight!

Thanks again

Paul

Originally Posted by Broomstick

Hi I have a F16 Myself and have found out thye dont like any other crystal EXCEPT Futaba ones.As far as your servos twitching may i suggest that if you ahve nto surpressed your motors this is where the inteferance is conming from,if you need supressor packs then Google Action Products and give dave Milburn a ring and he will sort you out


Stavros

Thanks for the reply Stavros. I think the problem with mine was due to incompatible crystals, like you say. I was using Hitech I think they were, and obviousley there no good.

The other problem was induction from the power cables in the submarine. I had to re-wire it totally, and separate all power lines and control wires totally. And the addition of ferrite rings helped a lot as well.

It was buggin the hell out of me at the time, couldnt get it fixed. But fingers crossed its ok now !

Thanks for the help Stavros.

Paul

Originally Posted by Screw Loose

I am having bother with my radio gear in my Engel Typhoon Submarine.

I am using a Robbe F16 transmitter and a Robbe 8 channel reciever. The problem I am having is all the servos are twitching, and the pumps and motors i have running off the reciever are switching on and off permanently. And when the motors and pumps are deliberatley turned on they go on and off!

I have moved the aerial away from batteries and motors etc. All motors are surpressed, and am fast running out of ideas!

Whats really odd is when I turn the transmitter off, the whole thing settles down, servos stop twitching, pumps and motors stop and everythings fine. Till I turn the transmitter on and it all goes mental !

Starting to think transmitter is faulty! So if anyone has any ideas I would love to hear them, this one is bugging me now !

Thanks

Paul

I have had that problem in the past with model cars 27 band and aircraft 36 channels, when out doors the problem stopped when the aerial was fully extended, never operate the transmitter with aerial down it can cause damage too it. It does sound like there a problem with the crystals not being matches.