[RTTY] Advise requested for RTTY Hardware

[Andrei Stchislenok]

Personally,
I prefer FSK only


2009/8/16, Kok Chen <chen at mac.com>:
>
>
> On Aug 16, 2009, at 11:37 AM, Joe Subich, W4TV wrote:
>
> > The only way to do FSK (as opposed to AFSK) with fldigi is
> > using an envelope detector/driver as is done in USB Interface
> > III (or as documented in the fldigi help files).
>
>
> No, that is not the "only" way.  You can use fldigi in normal AFSK
> mode, and use K4DSP's FSK Regenerator:
>
> http://k4dsp.homeip.net/~doug/regenerator/
>
> It is however, not an appliance operator's box.  Some assembly and
> competency with a soldering iron is required (or use a solderless
> breadboard, as I had done when I was testing it :-).
>
> You can indeed use Doug's regenerator with any AFSK software on any
> operating system.  *Anything* that puts out an AFSK tone pair,
> including all the old TNCs (in AFSK mode) will work.  With Doug's
> regenerator, there is no need for a special 1 kHz secondary keyed
> tone.  Just use the standard 2125/2295 AFSK tone pair on a single
> audio channel.
>
> Simple as it is, the AVR firmware in Doug's circuit is not just an
> envelope detector, but the firmware includes a full fledged AFSK
> demodulator.  It does require a signal with good SNR, but a computer
> sound card output is more than clean enough for it.  It demodulates
> and slices the AFSK signal into an FSK signal (and while doing that,
> it also generates PTT).  It will also generate an independent CW
> keying signal for various Windows and Mac OS software that generates
> CW for J2A modulation by the rig.
>
> 73,
> Chen, W7AY
>
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>



-- 
73's Andrei
EW1AR-NP3D
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