RC Radios, Transmitters, Receivers, Servos, gyros Discussion all about rc radios, transmitters, receivers, servos, etc.

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Old 05-18-2003, 09:28 PM
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dan1220
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do any crystals work with any transmitter/reciever? Or do thaey have to be the same brand or what?
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Old 05-18-2003, 11:01 PM
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m.gramling
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The Tx, crystal needs to be in the Tx, and the Rx crystals needs to be in the Rx. You also need to use the brand crystal as the radio manufactor.
Example,
Use Jr in Jr equipment only
Futaba in Futaba only,
Hitec in hitec only.
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Old 05-18-2003, 11:40 PM
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ok, so what If I wanted to have a traxxas reciever and a futaba radio? I d need 2 sets?
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Old 05-19-2003, 01:33 AM
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I really don't understand your question.

But say for instance, in one plane I use
JR Transmitter, with a Hitec (JR compatiable) receiver. Naturally the JR Tx has a JR Tx crystal, and the Rx has hitec Rx crystal.
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Old 05-19-2003, 10:16 PM
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Originally posted by dan1220
ok, so what If I wanted to have a traxxas reciever and a futaba radio? I d need 2 sets?
Traxxas reciever with Traxxas crystal on the same channel as the Futaba crystal in the Futaba transmitter. Most manufacturers sell the Tx and Rx crystals seperately.

By the way, in the US, it is illegal to swap crystals in the Tx. It is legal to swap Rx crystals.
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Old 05-19-2003, 11:46 PM
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I know it is illegal but by te sounds of it, it sounds like nobody really obeys that law
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Old 05-19-2003, 11:54 PM
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Originally posted by dan1220
I know it is illegal but by te sounds of it, it sounds like nobody really obeys that law
Kind of like the speed limit on the highway / Interstate. Many people ignore it, but boy do they complain when they get caught.

If you swap transmitter crystals, please don't fly at my field.
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Old 05-20-2003, 10:29 PM
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Not that im going to go out and break this law because I havent, but who would check? do people check? Just remember Im new
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Old 05-20-2003, 10:49 PM
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strato911
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As far as I know, no-one is actively performing spot-checks. However, it is almost guaranteed that is when an accident occurs and a claim is filed with the AMA, they will refuse a claim if evidence of crystal swapping is found, and they would likely report it to whoever enforces the FCC regulations.

The biggest problem as I see it, not enough people know it is illegal. With my previous analogy, the speed limit is clearly posted every few miles... I have never seen the FCC regulations posted at a flying field.
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Old 05-20-2003, 11:27 PM
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What type of accident could happen? Why is it illegal? Im only 15 so dont think im dumb
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Old 05-21-2003, 12:35 AM
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Dan - I would never have made that assumption.

If a plane goes out of control due to interference, or some other reason, it can kill or hit cars, houses, etc... and do damage. More importantly, an out-of-tune transmitter can cause interference to the industrial users in between our channels.

Why is it illegal? there are a number of theories, but the main thing is the law says so. We don't have to agree with it, but we do have to obey it, or risk the consequences.

Most people familiar with these laws (including myself) believe it is primarily due to those industrial users I mentioned. Imagine if your transmitter is slightly out-of-tune, but not interfering with anyone at the field. You keep flying, without realizing you've caused industrial equipment to malfunction and hurt someone.
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