Package: minimodem
R P Herrold
herrold at owlriver.com
Thu Oct 3 14:29:00 EDT 2013
On Thu, 3 Oct 2013, Jimmy Carter wrote:
> As an example application: Recently I made a RTTY encoder for the
> arduino (https://github.com/kg4sgp/arduino-rtty) that with a GPS I use
to answer one question there
Figure out why the sample rate needed to be modified
to get accurate frequencies and baud rates and if they're
consistent across arduinos!
Not all Arduinos are crystal controlled and so encode and
decode loops man need to be tweaked to per device frequencies.
Also, of you are only pulling two samples (the minimum
required under for non-synchronous, external clocked locked
data) by the Nyquist sampling theorem [1] for a digital (two
state) signal.
More samples per frame will add robustness but one has to look
for aliasing effects
> whole thing might be used for a high altitude balloon flight with a club
> that both of us are involved with (http://wiki.w8upd.org).
much fun
>> You don't say, but: maintained at Fedora as an SRPM?
>
> I don't understand exactly what you're asking. It is in the fedora
> repositories
yup -- I found it later
> Thanks! Activity is always good I guess :).
73
-- Russ herrold
[1] http://en.wikipedia.org/wiki/Nyquist–Shannon_sampling_theorem
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