Let me add to that. FCC care for emissions, any emissions that falls within
the FCC bible. That include Rx emissions of a pre-approved radio product.
Any RF Rx product that has one or more oscillators is potentially harmful
until proven safe. Once proven safe, changing Xtals in Rx beyond its factor
specifications (in theory) should not cause FCC concern but may cause Rx
frequency offset. A Rx with offset frequency is a concern shared by the
insurance company, and thus pilots who want to swap in non-standard Xtal.
-YK
in Seattle
----- Original Message -----
From: Graham <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, May 27, 2000 7:23 AM
Subject: Re: [RCSE] swapping JR Tx crystals
> Generally speaking, transmitters traditionally, at least in recent
history,
> have been the only radio devices that needed to be licenced while
recievers
> were not.
>
> I would think that swapping is not FCC approved as you would in all
> probability your transmitter would no longer be properly tuned to the
channel
> of your xtal and would be in violation of being off frequency as well
> interference
> on adjacent channels and possibly spurious signals out of band (ie
harmonics).
>
> So, to swap xtals in transmitters you would need to have the transmitter
> adjusted
> to its new frequency which would have to be done in a radio by someone
with
> the proper equipment
>
> cheers, Graham
>
>
> At 08:29 AM 5/27/00 -0400, you wrote:
> >when i needed a new flight pack, i figured that
> >getting a JR 421 radio would at least provide
> >a 2nd Tx battery pack, as well as, a 2nd set of
> >crystals. i've been swapping Rx crystals, but
> >thought i read that the JR transmitters are not
> >FCC approved to allow field swapping of their
> >crystals.
> >
> >is this true, and if so, what would it take to
> >swap the Tx crystals?
> >
> >Gregory Ciurpita
> >Lucent Technologies, Bell Laboratories
> >Room 1N436, Crawford Corner Road, Homdel NJ 07733
> >(732) 949-5771 [EMAIL PROTECTED]
> >
> >"Good programs work. Great programs are easy to debug!"
> >RCSE-List facilities provided by Model Airplane News. Send "subscribe"
> and "unsubscribe" requests to [EMAIL PROTECTED]
> >
> >
> -------------------------------------------------------------------------
-
> Graham [EMAIL PROTECTED]
>
> Are the shadows there for me to find, or placed there by my searching
mind.
> When I reach and find them gone, was I right or was I wrong?
>
> -------------------------------------------------------------------------
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