Changing Frequencies.....danger??

[Ken Thompson]

I'm guessing, Dwayne, that when you change the settings on a synthesized 
module the tuning, for proper output, is done automatically.  If you were to 
change a crystal in the "fixed" module, you would have to get the module 
re-tuned to match the new channel, all probably the same price as getting a 
new module.

I've got a couple of modules I'm going to get re-tuned and will buy new 
modules in the future.

Ken
----- Original Message ----- 
From: "dwaynenancy" <dwaynenancy at cox.net>
To: <discussion at nsrca.org>
Sent: Wednesday, June 29, 2005 11:21 PM
Subject: Re: Changing Frequencies.....danger??


> The synthesized modules have had to pass a FCC test to be accepted.  It is 
> not the same as changing crystals.  Dwayne
> ----- Original Message ----- 
> From: "Ken Thompson" <mrandmrst at comcast.net>
> To: <discussion at nsrca.org>
> Sent: Wednesday, June 29, 2005 8:07 PM
> Subject: Re: Changing Frequencies.....danger??
>
>
>> Pretty good question Scott, after our conversation on Sunday, I looked 
>> this on the RC Universe Futaba forum.  Futaba tech support says that the 
>> changing of crystals in the transmitters such as the 6XAS is illegal 
>> according to the FCC.  Not having the transmitter re-tuned could allow 
>> some errant radio waves to be emitted that could possibly cause some 
>> interference outside of the RC range of the 72MHz band.  This still 
>> doesn't explain the synthesized modules.
>> As I told you Sunday, I have been switching modules for different planes, 
>> without any ill effects, but that doesn't mean I'm doing the right thing.
>>
>> Ken
>>
>> Sorry I didn't get back to you today, I just now got a minute, I'll give 
>> you a call.
>>
>>
>> ----- Original Message ----- 
>> From: <F3AFlyer7 at comcast.net>
>> To: <discussion at nsrca.org>
>> Sent: Wednesday, June 29, 2005 8:41 PM
>> Subject: Changing Frequencies.....danger??
>>
>>
>>> Well I've heard a couple of opinions on this so I figure I'd get some 
>>> more. I need to get a new frequency for the NATS but don't want to send 
>>> my transmitter in. I have a Futaba 9C. Some have told me that I can 
>>> change as many frequencies as I want without mishap, while others have 
>>> told me that you can only go 6 up or 6 down or else your transmit range 
>>> gets shorter. Is this true for transmitters with crystals in them only, 
>>> or for both crystal and module transmitters? If this is also true for 
>>> module transmitters, then why are there synthesized modules for the 9C?
>>>
>>> Thanks!
>>>
>>> Scott
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>
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