Jim, I haven't read that yet, but I have a question. Perhaps you
are correct that it will be a bandwidth hog, but perhaps not. It
is likely true that the single signal needs a wider bandwidth,
but can other stations - better yet, other QSOs be going on at
the same time on the same spectrum of bandwidth? If the answer
is yes, which I suspect, then the bottom line will be better
spectrum usage (which is what you get with narrower bandwidth -
it's just another approach).
I'm curious to find out.
73
Rick
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]On Behalf Of Jim Reid
Sent: Friday, February 13, 2004 9:48 PM
To: tentec@contesting.com
Subject: [TenTec] Occupiedd Bandwidth
Ref, the discussions here about used bandwidth.
How about the occupied bandwidth of the "comming"
ditital audio signals. Per Doug Smith's web site, a
unit is now on the market, a gadget called an
ARD9800, being built by AOR USA, Inc. see:
http://www.aorusa.com/ard9800.html
As I gather from the description and specs given, this
"digital SSB" signal will fully occupy 3 kHz of bandwidth
using 36 separate PSK carries for all the needed info!!
Wonder what sort of "bagpipes" that will sound like when
you happen to tune across one? Can hardly wait to
hear one. And talk about 60 meter tuning needing to be
accurate; evidently to demodulate and hold a QSO, both
ends must be "precisely" on the same frequent -- wonder
where in the 3 kHz spread of PSK carriers you need to
be, hi. The signal is also near 100% duty cycle as with
all PSK.
73, Jim KH7M
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