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Old 03-25-2006 | 06:34 AM
  #47  
SimjetAU
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Joined: Feb 2002
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From: BrisbaneQueensland, AUSTRALIA
Default RE: Opto-isolator or not

I have been reading this thread with interest and there are good arguments for both sides. My personal opinion is KISS for those who dont know its (Keep It Simple Stupid) I am involved in electronics on a daily basis. Two way radio, satellite telphones, design and manufacture of many different electronic projects for other companys and also do repairs to radio control and also bandwidth testing for them here. I dont think I have ever had any rf interferance in my leads and I do have some long leads in my models. I always try to keep things simple because the more stuff you put into your model the more chance you have of a failure. Its true electronic devices are extremely reliable nowdays but the more of them in there the more chance you have of having a failure. There are only a few simple things that I always do and it works and has done for 30 years of modelling and the last 6 or 7 years with turbines as well. I only ever use heavy duty servo leads and once they get past 400mm long I make my own from much larger cable. I have the plug housings and pins and use a special wire I get locally which is silcone seathed and looks like miniture welding cable. The key here is VOLTAGE DROP !!!. Most problems are caused by this and its mostly generated in all the leads not in the busbar of the receiver. just measure how long the cable from your battery to your switch to your receiver then out to your servo is....you might be very surprised . The radio manufacturers need to address this problem. They need to supply decent heavier duty leads. The other main issue is batteries. Everyone needs a decent microprocessor based charger to make sure batteries are never overcharged. My rule of thumb is to change my batteries every 2 years regardless this ois not costly and very good insurance. I use nicads because the technology is well proven and can take large current draws and also large current swings just like what we put our servos through in flight. I dont believe that dual batteries are anything but extra weight if needed for balance. I also charge after every flight all batteries but this is only with a good quality charger and I have tried a lot of different chargers and have found some to be lacking or they overcharge the batteries. Its horses for courses I suppose and everyone is entitled to do what ever they think will help protect thier $10,000+ model and if you feel comfortable with all this great technology then thats fine with me...dont get me wrong I dont hate new technology I think its great......but I feel that personally I prefer to keep all my models nice and simple. I have only ever had 1 crash with a jet in 7 years of flying them. That crash was caused by a shoot down and it was basically total destruction...the only thing that was salvaged was the engine and that cost me $700 to repair but all the rest was written off. So for all that written above my last word on the matter is KISS

Regards

Mark Kyle
Simjet Distributor Australia
Kyle Communications Pty Ltd