[amsat-bb] Re: DTMF on HF?

kc6uqh at cox.net kc6uqh at cox.net
Fri Jan 10 21:05:01 PST 2014

 A -16dB pilot carrier would solve the frequency offset problem. This was a
common solution for Marine shore stations in the last century.

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Joe Leikhim
Sent: Friday, January 10, 2014 2:31 PM
To: amsat-bb at AMSAT.Org
Subject: [amsat-bb] Re: DTMF on HF?

Since DTMF has two tones for each number, it would seem possible that you
could have some DSP detect the difference frequency of each pair and then
either adjust its decoders or QSY the receiver's VCO to get a lock. 
There are a ton of small development boards like Raspberry PI that have
hardware that might be able to do this.

Has anybody got the AMSAT-bb daily digest to work through their e-mail
provider other than Gmail?

Joe Leikhim

Leikhim and Associates

Communications Consultants

Oviedo, Florida

JLeikhim at Leikhim.com



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