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Futaba crystals in old Airtronics???

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Old 02-13-2003, 03:03 AM
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t4
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Default Futaba crystals in old Airtronics???

Hey--my first post on RCU.

Has anyone had any success using Futaba crystals in early '90s gold sticker Airtronics transmitter & receiver? I wonder what, if any, problem(s) this might present?
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Old 02-13-2003, 03:32 AM
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MikeL
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Default Futaba crystals in old Airtronics???

Other than it not working, it shouldn't cause any problems.
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Old 02-13-2003, 04:00 AM
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Lynx
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Default Futaba crystals in old Airtronics???

What is the deal with Futaba crystals? What is it about them that are different than 'standard' crystals?
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Old 02-13-2003, 03:20 PM
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jetranger-RCU
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Default crystals

Use the crystal made for the radio crystals are cut different for each radio
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Old 02-13-2003, 06:34 PM
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Steve Lewin
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Default Futaba crystals in old Airtronics???

Originally posted by Lynx
What is the deal with Futaba crystals? What is it about them that are different than 'standard' crystals?
Basically it's that there is no such thing as a standard crystal. A Futaba crystal in an Airtronics Rx is about as likely to work as Ford brake disc on a GM car. It might be similar or it might not .

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Old 02-13-2003, 09:54 PM
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Lynx
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Default Futaba crystals in old Airtronics???

What I don't understand is why? Do they just use slightly different reference frequencies to piss people off? That's all the crystal's are for. And if you can't interchange crystals with different brands then what frequency do these crystals ACTUALLY vibrate at? Because it's obviously not the frequency on the crystal itself, or they'd be interchangeable.
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Old 02-14-2003, 09:03 AM
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Steve Lewin
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Default Futaba crystals in old Airtronics???

There is a lot more to the specification of a crystal than just the frequency. And the resonant frequency of the crystal is usually not the channel frequency marked on it for various reasons. In fact it is never that frequency for a receiver crystal.

It's one of those things where either you learn a fair amount about the way RF electronics actually work and then analyse exactly if particular crystals are likely to be interchangeable or you just use the specified crystal. 'Fraid I don't have time for the complete tutorial but there's plenty of information about if you're really interested.

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Old 02-14-2003, 07:58 PM
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Default Futaba crystals in old Airtronics???

In transmitters ,some transmitters use a different frequency multiplication scheme. The crystal oscillator may be require a different loading of the crystal. The capacitve loading of the crystal will also dictate a different crystal.

So much for the "A CRYSTAL is A CRYSTAL" stuff that has been spouted here recently huh ? And so much for the new Amateur Extra Class examination since one of those folks was an Extra Class amateur.
No evil conspiracy just an engineering call. Still the right crystal is the way to go.
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