[TenTec] Orion II Tuning Question

[Ron Castro]

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 at contesting.com> 
      Subject:  Re: [TenTec] Orion II Tuning Questions 
      From:  "Martin, AA6E" <martin.ewing at gmail.com> 
      Reply-to:  Discussion of Ten-Tec Equipment <tentec at contesting.com> 
      Date:  Thu, 26 Jan 2006 17:23:25 -0500 
      List-post:  <mailto:tentec at 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 at 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 at contesting.com
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>



--
martin.ewing at gmail.com
http://blog.aa6e.net
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