need some help please! - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-03-2006, 09:44 PM   #1
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need some help please!

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Hey guys, I just bought a car that came with the 2 servos, and receiver , but no controller. They are futaba , probably a few years old. I was under the impression that if I used one of my futaba controllers, and two like crystals that the system would work. Well they didn't, they would glitch but that was it. Can someone tell me the best course of action to get the system to work, could the receiver be to old to work with the radio I have? I don't know what to do. Thanks.
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Old 01-03-2006, 10:11 PM   #2
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Make sure you're on the correct modulation. If the receiver is AM, then your transmitter should be AM too and vice versa with FM. Those can never be different. If that checks out, make sure the crystals you're using are the same frequency. For example if you're using a 27.145 for your RX and 27.045 for your TX, that won't work. It'll glitch and might operate at close range, but that's it. If that checks out, then check both Antennas of the RX and TX. See if there are any frays or cuts or any type of damages to the antenna. If that checks out, then check for any outside interference. Things such as flourecent lights, TV's, motors, metal on metal rubbing, electrical lines, etc can cause interference. Move away from those areas. If all that checks out then it might be the receiver itself. An old receiver will tend to lose it's "tune" to the frequency. Since inside the RX are inductors and capacitors and resistors that do modulation and frequency selection, there is a chance that these parts may have exhausted themselves. Inductors are usually the main source because the ones used inside these particular RX's are variable. This means they have a ferrite rod that can be adjusted to tune the RX. As times goes by things like vibrations could cause the inductor to lose it's preset position therefore losing the wanted frequency. This would cause glitching. Your best bet is to buy a new RX and give that a try. Or if you want to keep the RX, then you can bring it to a technician and they can help you tune back the frequency. They got expensive equipment like a spectrum analyizer that can help tune it.
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Old 01-04-2006, 06:04 AM   #3
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If you need a radio check out the for sale area of the forum. There are always radios for sale. I sold a FM radio worth $300 for $80 a several months ago and I've see radios and receivers sell for as low as $30!!!
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