> The telemetry has to be very preceise because it is one-way (there's no
> way of making sure that the data has been received correctly). So I
> guess that makes an RC clock rather risky, hence the reason for using a
> watch crystal at 32kHz.

If your receiver has a better power source, you can let the sender run
off RC-clock and big timing tolerance (if it helps you to save power),
while the receiver can make use of its better resources and receive
even the worst-case signal right.

In the end it is OK, the receiver corrects what the sender messes up.

Much like mobile phones, where the base station sends with high power
to let the cheap mobile receiver see the signal.  And on the other
hand the base station has a very expensive and sensitive receiver
to still receive the weak mobile tx.  A similar tradeoff to minimize
cost & weight.

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