I can't really answer these questions, but I can tell you that Hitec
crystals seem to work fine in Futaba receivers, despite what Futaba says.
It would be interesting to know exactly who is mfg these things.
At 04:23 AM 4/8/01 -0700, Paul Klissner wrote:
>It is fairly common knowledge that manufacturers of
>RC receivers strongly recommend that only their brand
>of crystals be used with their receivers.
>
>I'm wondering if that is a question of manufacturers
>conservatively and arbitrarily limiting their liability
>(on the off chance of incompatibility) or if the risk of
>a serious problem is genuinely high? [Not that I'm
>advocating taking chances!].
>
>Is this an issue of FCC rule that manufacturers are following?
>
>If the risk of crystal/Rx incompatibility is high, can it be
>reduced or eliminated by having just a little more information
>than the typical uninformed consumer has?
>
>
>More specifically:
>
> How different *are* the Rx crystals really?
>
> How many varieties of crystal can there really be in
> the common high-profile crystal case? One? Two? Three?
> Or something as seriously evil as significant tuning
> anomalies which vary from lot to lot?
>
> Is there a simple test circuit anyone knows about that
> can detect differences among crystal batches in the same
> case that would affect Rx performance?
>
> Is there a good way to analyze and deterministically
> contrast crystals in an oscilloscope to determine their
> compatibility or incompatibility with one another?
>
>-Paul
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