[aprssig] DTMF on HF?

david vanhorn kc6ete at gmail.com
Fri Jan 10 17:16:50 CST 2014


Ssb would be a problem.  S/n ratio can be pretty poor, but the one thing
most decoders hate is twist.  Telco lines attenuate the higher pitches more
than the low.  Check the datasheet of the decoder you plan to use.

Fwiw, you can almost eliminate the interdigit silence if the digits are
different.  More later
On Jan 10, 2014 3:43 PM, "Robert Bruninga" <bruninga at usna.edu> wrote:

> Has anyone had any experience with any success at DTMF working on HF for
> some rudimentary commands?
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> I know tuning is critical as well as inter-tone noise must be way down.
>
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> Just thought maybe someone has experimented with it.
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> Bob, WB4aPR
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