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RX crystal question

Old 03-31-2003, 11:43 PM
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Default RX crystal question

ok, im kinda confused and need your guys inpt

Here is the dilemma, I was told its not good to swap out the crystal in a rx for something else becuase it might not work? hmm..

Scenario:

I have a old RX on chanell 20 and my current TX is on 34 so I want to drop a ch 34 crystal in the RX so I can use with my current TX. Is this something I can do?


Whats are rules regarding swapping out crystals etc?



matt
Old 04-01-2003, 01:40 AM
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Default RX crystal question

Depends on brand and age. We need more info.
Old 04-01-2003, 02:35 AM
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Default RX crystal question

I have a fairly new Futaba 6DA on ch 34
Old 04-01-2003, 01:44 PM
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Default RX crystal question

You did not say what receiver you have. If it is the receiver which comes with the Futaba 6DA system then it should be a R127DF receiver. If that is the case then from the Futaba Website:

"Futaba 72MHz receivers are all center tuned within 1/2 or the other 1/2 of the frequency band. So, if you have a receiver on any channel within 11-35 (72.010 through 72.490), you can purchase a receiver crystal and change it to any other channel within 11-35. If you have a receiver on any channel within 36-60 (72.510 through 72.990), you can change the crystal and use it on any other channel within 38-60. However, ALWAYS perform a full range check prior to utilizing the equipment."

Rich
Old 04-01-2003, 06:29 PM
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Default RX crystal question

you are correct rRich, the 127df is my receiver.

So from what I read I am able to perform the swap as long as I stay within the low band range. My old rx is on ch20 so I will swap the crystal and hopefully it will work.

thanks
Old 04-01-2003, 09:35 PM
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Default RX crystal question

I HAVE A FUT, 9C THAT WAS ON CH. 59, NOW I HAVE A CH 20 IN IT . I HAVENT HAD A BIT OF TROBLE WORKS FINE. BUT THEY ARE RIGHT DO A RANGE CHECK...
Old 04-02-2003, 12:42 AM
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Default RX crystal question

You can swap to any channel you want, but it'll cause the whole circuit to be further out of tune that you might like (decreased range) so just ground test it THROUGHLY, if it still works okay you're not gonna have a problem.
Old 04-02-2003, 04:54 AM
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Default RX crystal question

Slingshot,

Swapping Tx xtals is against FCC regs unless you're a licensed tech and retune the Tx.
Old 04-02-2003, 06:05 AM
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Default RX crystal question

herbtjj

I dont plan on swapping the tx crystal just the rx crystal..if that makes a difference.
Old 04-02-2003, 03:43 PM
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Default RX crystal question

It makes a big difference. Swapping Tx crystals is illegal, but swapping Rx crystals is legal.

Go ahead - all the rules are in your favor. Drop the ch34 crystal into the old (ch20) receiver, & perform a range check. If the range check is good, go flying.
Old 04-02-2003, 06:29 PM
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Default 9c

you mean you cant snap the modu. out and replace it with a new one with a differnt ch.
Old 04-02-2003, 07:02 PM
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Default RX crystal question

Yes, you can change the module, so long as the new module is one that is certified for use with that transmitter, Modules and transmitters are type certified as a unit.

It is legal to change the entire module (se above) but illegal to change the xtal unless you are a certified tech with the proper equipment to retune/verify correct operation.

It is also illegal to use a module from a manufacturer that is dfferent than your transmitter, e.g. Hitec module in a Futaba transmitter. Yes I know that a lot of people have done that and that it works, the fact ramains that it is illegal to do so.

Jerry
Old 04-02-2003, 07:07 PM
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THANKS MR. JERRY. NOW I NO
Old 04-03-2003, 02:31 AM
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Default RX crystal question

Originally posted by transmission_dr
It is also illegal to use a module from a manufacturer that is dfferent than your transmitter, e.g. Hitec module in a Futaba transmitter. Yes I know that a lot of people have done that and that it works, the fact ramains that it is illegal to do so.

Jerry
Thanks for the support Jerry. I've contacted a couple on-line retailers which had the Hitec Spectra module advertised for use with Futaba, and after pointing out that this violated the FCC regulations, they promptly changed their web-sites.

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