Jim, Not a thing IF everything with the AFSK setup is operating properly.
Unfortunately, that is not always the case and unlike SSB, where someone
will tell you about hum or hiss or RF on your audio, with AFSK you just
don't make contacts because your signal may be difficult, at best, and
impossible at worse, to copy. With FSK always delivering the proper tone
shifts and not utilizing the microphone audio stages, copy is always
reliable. I can usually detect the difference between AFSK and FSK by the
more critical tuning required for AFSK, even at its best. 73, Rog-K9RB
PS: Maybe this tread has gotten away from the Ten-Tec reflector purpose, and
if that is true, someone speak up or just reply to me privately and I'll be
happy to reply privately also, but I think we've already covered all there
is about AFSK vs. FSK and I apologize to those many with no interest in this
subject/tread. My e-mail address is K9RB@arrl.net
----- Original Message -----
From: "James Duffer" <firstname.lastname@example.org>
Sent: Friday, April 04, 2003 9:09 AM
Subject: Re: [TenTec] Fw: Orion
> Please explain the difference between "true Frequency Shift Keying and the
> pseudo FSK as generated by the Orion (and others). It seems to me that if
> in truly carrier suppressed SSB signal that is moulated by a pair of
> sinusoid audio tones the ouput would appear to alternate in frequency by
> frequency difference of the two audio tones.
> What does the receiver get that is different from true FSK and the other
> >From: John L Merrill <email@example.com>
> >Reply-To: firstname.lastname@example.org
> >To: email@example.com
> >Subject: [TenTec] Fw: Orion
> >Date: Thu, 03 Apr 2003 23:30:17 -0500
> >I'm afraid I'll join Rog on the FSK issue. I'm a rtty purist. I'm
> >disappointed there is no true fsk on the Onion. Seems like Kenwood and
> >are the only ones that care about fsk. Yaesu does the keyed afsk way.
> >issue may hold me back from ordering one.
> >John N1JM
> >TenTec mailing list
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