hi
Regarding AF vs RF. Audio is heard by the ear, and consists of of
compressions and rarefractions
of air. RF (radio) is high frequency alternations of electric current, and
is independent of the
surrounding atmosphere. The frequency can be the same; you will hear AF and
not RF, provided that
the RF field is not strong, and does not shock excite any loose metal,
example, horizontal oscillators in tv sets adversely affecting loose wires.
The 14 kHz IF would only be detected by
ear if a wire was loose and the fiels was strong, exremely unlkely with
today's equipment.
Ron
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]On Behalf Of nq5t@attbi.com
Sent: Monday, May 05, 2003 9:52 PM
To: tentec@contesting.com
Subject: Re: [TenTec] Hello Orion Users
The relationship only exists because of the physical nature of how
those two sensors on the sides of our head work. The distinction
between audio and not-audio is irrelevant in this situation. As
someone else pointed out, the difference has to do with definition of
baseband frequency for the DSP IF. There's no relationship to what
happens in the 14Khz IF system (pre-detection) to "audio" DSP.
A dog can nearly hear a 50Khz IF signal, so following the "it's audio"
logic, I guess we could say a drake 2-B has a linear "doggie audio"
IF? :-)
Grant/NQ5T
> Well, I think you guys are both right.
>
> The DSP operates ahead of the audio stage, and thus can be called IF.
>
> Of course, the frequency of 14 khz is certainly in the audio range.
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