[amsat-bb] Re: DTMF on HF?

Kevin Muenzler, WB5RUE kevin at eaglecreekobservatory.org
Fri Jan 10 11:28:47 PST 2014

I doubt that it would be useful because the tolerances are extremely high in
DTMF so if you are only a few Hz off the tones won't lock.  FM might be ok
but certainly not SSB.  FM itself has its own problems on HF so that might
not be useable either.

Kevin Muenzler, WB5RUE
Eagle Creek Observatory
I'd be unstoppable if it weren't for law enforcement and physics

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Robert Bruninga
Sent: Friday, January 10, 2014 11:10 AM
To: aprssig at tapr.org
Cc: amsat-bb at amsat.org
Subject: [amsat-bb] DTMF on HF?

Has anyone had any experience with any success at DTMF working on HF for
some rudimentary commands?

I know tuning is critical as well as inter-tone noise must be way down.

Just thought maybe someone has experimented with it.

Bob, WB4aPR
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