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Re: [TenTec] Orion time domain issues, QSK

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Orion time domain issues, QSK
From: "Ron Castro" <ronc@sonic.net>
Reply-to: Ron Castro <ronc@sonic.net>,Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 5 Jul 2006 14:28:14 -0700
List-post: <mailto:tentec@contesting.com>
Martin:  Good job on the manuscript!  It would be interesting to see of 
those measurements are any different in the other versions and on the O2.  I 
don't do much CW, although I'm going to try to upgrade my skills for 
contesting.  When I do use CW, I generally set the Orion II QSK to 20% since 
I find full QSK to be distracting.

I wonder if the some of the audio distortion in the monitor that some folks 
have mentioned might actually be the result of delay.  This is a problem 
that has come up recently in broadcasting since most processors have gone 
digital, as have many mixing boards, studio transmitter links, and 
transmitters, and some jocks who use true on-air monitors to listen to when 
they talk have been complaining.  Most processors use 3 to 6 mS of delay, 
however the latency on T1 circuits that are often used to feed transmitters 
via land lines varies quite a bit.  Most agree that 6 mS is not a problem, 
but when delay gets over 25 mS it gets noticeable.  Things will change when 
HD Radio comes of age, since it requires a full 6 seconds (not mS) of delay 
of both the digital and analog signals to accomplish the forward error 
correction scheme and blend back to analog when the digital signal fails.


----- Original Message ----- 
From: "Martin Ewing" <ewing@ewing.homedns.org>
To: <orion565@yahoogroups.com>; "Discussion of Ten-Tec Equipment" 
<tentec@contesting.com>; <orion@contesting.com>
Sent: Wednesday, July 05, 2006 1:37 PM
Subject: [TenTec] Orion time domain issues, QSK

> Because of the lately revived discussion of Orion's QSK, I decided it
> was time to finally publish a manuscript that has been lying around on
> for some time.  Check out blog.aa6e.net <http://blog.aa6e.net>.
> I got interested in time delay while trying to make sense of ionospheric
> backscatter echoes.  The Orion makes a fair radar set, but you have to
> understand how it is delaying the Rx signal.  This sheds some light on
> the QSK problem, too.
> Comments welcome.
> 73 Martin AA6E
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