I understand that the new JR radios carry a warning NOT to Change the
crystal in the module, against the FCC Rules.
.........bc ([EMAIL PROTECTED]
http://www.widomaker.com/~conk
Williamsburg, VA 23185
On Mon, 19 Aug 2002, Tom Watson wrote:
> This issue has come up at least twice in the past year
> or so...and it seems that every time it does, Horizon
> gives a different response (last time, they said swap
> TX crystals to your hearts' content; this time,
> they're saying no). Bottom line: I don't believe
> anything Horizon says.
>
> Last go-around, I think I posted an extensive article
> on radios that I found a couple of years ago, which
> includes detailed discussion on why the TX RF deck
> (i.e. the module) should be tuned for a specific
> frequency and why, in fact, a given tuning 'point'
> cannot possibly cover all channels in a band. I can
> dig it up again if there's interest.
>
> You'll hear testimony here from people who switch
> crystals anyway to save the cost of a module (foolish,
> IMHO) and it will work sometimes, but I don't think
> the risk is worth it (and the risk is not just to your
> plane, but to others whose channel could be stepped on
> from a poorly configured TX).
>
> Bottom line: Sounds like the choice is yours, but
> personally, I'll keep a separate module for each
> channel I fly. Your mileage can and will differ, so
> no need for someone to start a religious war here...
>
> Tom
>
>
> --- Original Message ---
> From: Craig Burton <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: [RCSE] Changing TX frequency on a JR 8103
> module?
>
> >Does anyone know _definitively_ whether a Tx module
> is "tuned" for a given
> >channel?
> >
> >For example, I purchased my 8103 on channel 26
> (72MHz) and I've had no
> >problems using a channel 22 crystal in the same
> module. However, I recently
> >checked with Horizon Hobbies and they hinted that the
> module itself needs to
> >be tuned to the specific crystal being used. (The
> salesperson even went so
> >far as to recommend buying the Tx/Rx crystals in
> pairs so they would be
> >matched!)
>
>
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