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Hitec crystal in Futaba 127 receiver

Old 09-08-2008, 11:53 AM
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JollyPopper
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Default Hitec crystal in Futaba 127 receiver

I am in the market for a good used Futaba 127 receiver, preferably on channel 41, for an old plane whose receiver went south. There is one inthe marketplace here, not on channel 41, but with a Hitec crystal in it. Just in the interest of knowingwill that work? I know Hitec and Futaba components are both negative shift and virtually interchangeable as components, but will a Hitec crystal work in a Futaba receiver or the other way around? I suppose if they are exactly the same size physically, they would, since a crystal basically just vibrates at a very precise frequency. Any input?
Old 09-08-2008, 12:28 PM
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BarracudaHockey
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Default RE: Hitec crystal in Futaba 127 receiver

There's plenty that will say it will work fine and indeed it may.

You just have to decide whether or not your plane is worth more than the 12 dollars it will cost to get the proper crystal.
Old 09-08-2008, 03:40 PM
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A.T.
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Default RE: Hitec crystal in Futaba 127 receiver


ORIGINAL: JollyPopper <snip> I suppose if they are exactly the same size physically, they would, since a crystal basically just vibrates at a very precise frequency. Any input?
Futaba crystals are actually larger than Hitec crustals and do not fit into a Hitec Xtal holder.
Whilst some say that the 72Mhz xtals have been interchanged in USA, they are definitely not interchangeable elsewhere.
Crystals are no longer interchangeable between brands, contrary to popular belief they are totally different in cut, overtone value and a few other specs. e.g. Hitec DC RX crystals on 35.36 & 40MHz have a frequency 10.7MHz ABOVE the nominal frequency whereas Futaba DC RX crystals are 10.7MHz BELOW nominal frequency. Hitec FM TX xtals are cut at half nominal frequency whereas the Futaba FM TX xtals are cut at 1/3 nominal frequency.
Whilst you may get reasonable results in good conditions with Hitec xtals in Futaba RX, Hitec crystals must be used in Hitec RX for optimum results. Futaba single conversion RX crystals may appear to work but with proven less range and glitching, especially noticeable in damp weather or wet ground. Local radio technician was surprised but ran a number of tests with result he is also now convinced that there is a significant difference in the crystals as has also been confirmed by the local crystal manufacturer who supplies USA military and others requirements.
For further information, refer to Crystal compatibility between brands
Regards
Alan T.
Alan's Hobby, Model & RC FAQ Web Links
Old 09-08-2008, 07:39 PM
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airbusdrvr
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Default RE: Hitec crystal in Futaba 127 receiver


ORIGINAL: JollyPopper

I am in the market for a good used Futaba 127 receiver, preferably on channel 41, for an old plane whose receiver went south. There is one inthe marketplace here, not on channel 41, but with a Hitec crystal in it. Just in the interest of knowingwill that work? I know Hitec and Futaba components are both negative shift and virtually interchangeable as components, but will a Hitec crystal work in a Futaba receiver or the other way around? I suppose if they are exactly the same size physically, they would, since a crystal basically just vibrates at a very precise frequency. Any input?
I sent you a PM
Old 09-09-2008, 07:58 AM
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ronwc
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Default RE: Hitec crystal in Futaba 127 receiver

I've used Hitec rx crysatls in Futaba rx's for over 10 years with no problems - but found that the Futaba crystal didn't work in Hitec -

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