[TenTec] Occupied Bandwidth

[Eric F. Richards]

Hi, Rick,

The short version is that to provide 200 Hz-3.8 kHz audio response the
ARD9800 uses only 2.4 kHz bandwidth.  Many many sets of discrete subcarriers.

Eric


At 06:00 AM 2/14/2004 +0100, you wrote:
>Thanks Eric but I don't get QST over here.
>
>-----Original Message-----
>From: tentec-bounces at contesting.com
>[mailto:tentec-bounces at contesting.com]On Behalf Of Eric F.
>Richards
>Sent: Saturday, February 14, 2004 12:44 AM
>To: tentec at contesting.com
>Subject: RE: [TenTec] Occupied Bandwidth
>
>
>The bandwidth issue was addressed in the review of the AOR
>product
>in 2/2004 QST.
>
>At 11:30 PM 2/13/2004 +0100, you wrote:
> >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 at contesting.com
> >[mailto:tentec-bounces at contesting.com]On Behalf Of Jim Reid
> >Sent: Friday, February 13, 2004 9:48 PM
> >To: tentec at 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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> >
> >
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>
>--
>Eric F. Richards
>efricha at dimensional.com
>"The weird part is that I can feel productive even when I'm
>doomed."
>   - Dilbert
>
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--
Eric F. Richards
efricha at dimensional.com
"The weird part is that I can feel productive even when I'm doomed."
  - Dilbert