Actually, the tuning process sounds quite a bit more complicated than that. If
I read the paper by Ten Tec's CTO and the article by Doug Smith on the Ten Tec
Orion web page right, the LO tunes only in steps of 2.5 kHz. The 2,499 1 Hz
steps in between are accomplished by a very clever use of DSP, which I would
imagine takes a chunk of processor power. I don't profess to understand much
of what was written (my eyes glazed over after about three paragraphs!), but it
seems that the stepping arrangement in the Orion is not the basic
"step-by-step" system used in other rigs, which is probably how the phase noise
is kept to such amazingly low level.
Ron
N6AHA
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Orion II Tuning Questions
From: "Martin, AA6E" <martin.ewing@gmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 26 Jan 2006 17:23:25 -0500
List-post: <mailto:tentec@contesting.com>
Yes, besides if you're a QSK person, you're spending a few ms in receive
between each code element!
The interrupt service argument is good, except that the time to service an
interrupt is (or should be) measured in microseconds, i.e., not very
noticeable. For the VFO encoder, all it has to do is increment a counter
and release, in principle. (The VFO setting has to be updated, but not for
every encoder tick when things are changing fast.) Of course if the code is
not well structured, the interrupt can take a lot longer. That's why this
kind of test is interesting -- it tells you something about how the control
code is written and how buggy it is likely to be. In version 2, people say
everything's a lot better. That remains to be seen on the Orion 1.
73 Martin AA6E
On 1/26/06, Sinisa Hristov <shristov@ptt.yu> wrote:
>
> Robert & Linda McGraw K4TAX wrote:
>
> > Changing passband tuning or changing power while sending? Very strange.
>
> On the contarry, I find it very reasonable to adjust BW, RIT
> or something similar while sending in order to ensure better reception.
>
>
> 73,
>
> Sinisa YT1NT, VE3EA
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
--
martin.ewing@gmail.com
http://blog.aa6e.net
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