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Re: [RTTY] AFSK to FSK converter

To: rtty@contesting.com
Subject: Re: [RTTY] AFSK to FSK converter
From: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 17 Sep 2012 08:43:57 -0400
List-post: <rtty@contesting.com">mailto:rtty@contesting.com>

On 9/17/2012 6:40 AM, Doug Faunt wrote:
>
But the K4DSP unit should be simple enough to wire up on perf-board-
there are only a dozen components aside from the connectors.

The question is whether the K4DSP unit (QST article here for members:
http://p1k.arrl.org/pubs_archive/139117) will even work with 2Tone.

The developer of 2Tone refuses to adopt a fixed frequency mode - it's
AFSK only with AFC running all the time.  Since the K4DSP interface
expects to decode fixed frequency tones (2125/2295 or 1275/1445) how
well does it work with "drifting" inputs?

The lack of *fixed* inputs may be a serious limitation with any
regenerator - whether it be the K4DSP design of a simple PLL tone
decoder:
www.electroniq.net/radio-frequency/fsk-demodulator-using-lm565.html

73,

   ... Joe, W4TV


On 9/17/2012 6:40 AM, Doug Faunt wrote:
It's not been mentioned on the RTTY list before, just N1MM-digital, and
I'm not getting those emails (not enough bandwidth most of the time).

But the K4DSP unit should be simple enough to wire up on perf-board- there
are only a dozen components aside from the connectors.

73, doug


ORIGINAL MESSAGE:
On Mon, 17 Sep 2012 02:41:15 -0400, Doug wrote:

Obviously, I've missed something- what's "2 Tone" in this context?
Google
isn't being helpful.

73, doug

REPLY:
It's a new program which can replace MMTTY but only with N1MM.

Check the archives back a week or two.

73, Bill W6WRT
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