Crystals

[MILLER, EDWARD, MGSVC]

Yes. FYI, I was told with Futaba's, "Low Band Rx" are tuned to channel 18, "high band Rx" are tuned to channel 53. Futaba low band covers channel 11 to 35, high band covers channel 36 to 60. What you cannot do is change crystals to a different frequency in the Transmitter/transmitter RF module, this is breaking the law. Of course if you have Futaba's synthesized "dial a crash", you don't have this problem.
Ed M. #841 already renewed for 2003.




-----Original Message-----
From: Jeff Hughes [mailto:jhughes at hsonline.net]
Sent: Thursday, December 12, 2002 3:30 PM
To: discussion at nsrca.org; discussion at nsrca.org
Subject: Re: Crystals


I guess the real question is can a futaba receiver be "retuned" for the 
opposite range? 

> 
> 
> Some brands are tuned to work with the whole range. Futaba and I 
think JR 
> are tuned for high and low.
> 
> 
> 
> 
> 
> >From: s.vannostrand at kodak.com
> >Reply-To: discussion at nsrca.org
> >To: discussion at nsrca.org
> >Subject: Re: Crystals
> >Date: Thu, 12 Dec 2002 14:13:56 -0600
> >
> >No problem.  THe differences are in the receivers, not the 
crystals.  Just
> >be sure you know if your reeiver is low or high band, then just buy 
the
> >crystal a channel that the receiver will work with.
> >
> >--Lance
> >  Forgive my ignorance....  My local hobby store sells receivers, 
PPM, and
> >separately sells crystals for them.  Might be channel 6..or 60.  
Could
> >this be a problem?
> >
> >Harry..
> >
> >  ----- Original Message -----
> >
> >From:  s.vannostrand at kodak.com
> >
> >To:  discussion at nsrca.org
> >
> >Sent: Thursday, December 12, 2002 1:59 PM
> >
> >Subject: Re: Crystals
> >
> >
> >
> >Tony S can give you the tech detail, but receivers are tuned 
circuits. The
> >crystal is key to creating the reference frequency used to filter the
> >signal picked up on the antenna.  The crystal sets up the basic 
reference
> >frequency and the circuitry around it can only be used for a narrow 
range,
> >or band, of frequencies.  The futaba receivers come in two types 
that have
> >components that tune each to a different band.  You can put a low 
freq
> >crystal in a high band receiver, but you'll have a detuned system, 
reduced
> >range, and possible signal lock loss.  I wouldn't do it.
> >
> >--Lance
> 
> 
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