[GreenKeys] Re: M20-RO

Tue, 4 Feb 2003 18:42:42 -0500

I have in a different life..
Assuming you have a receiver with enough bandwidth all the way through the
audio section
(now you know what that 16KC BW position on the R390 is for), you can use a
frequency
selective voltmeter to tune and demodulate each of the many subcarriers that
may be there.
The FSM will have to have detectors appropriate for the type modulation used
on the subcarrier.
Have also used them to demodulate the various channels on the baseband of
microwave systems.
Howard Weeks K5JCP
Harlem, GA
----- Original Message -----
From: Chuck Swiger <[email protected]>
To: <[email protected]>
Sent: Tuesday, February 04, 2003 9:44 AM
Subject: Re: [GreenKeys] Re: M20-RO

>And more from memory, so if I am wrong on a detail or two,
>someone add to this.  I think the basic AP Lenkurt system was
>a 16 channel AFSK multiplex system, that would allow 16 channels
>of data on a voice grade phone line.

Gang - just curious, is this anything like FDM signals on shortwave?

 From what little I've picked up thru the years there are or used to be
'buzzsaw' sounding signals that were reportedly multiplex feeds - has anyone
here ever decoded those?

For more details see the Utility Net at
http://www.wunclub.com/digfaq/signals.html
and scroll down to MULTI-CHANNEL/BUZZSAW like signals (1-I).  I'm always
hopeful of picking up printable intelligence thru the aether. I sure miss
George's
RTTY station - It seems like the FCC can't do anything right!

--Chuck
kb4new

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