[TenTec] Orion Noise Reduction Ability

[Gary Hoffman]

I wish I could be more directly helpful by remembering the exact reference,
but unfortunately it eludes me just now.  The only part I remember clearly
is that when the newer firmware releases came out, significant readjustments
of user-settable parameters had to be made to preserve performance.  They
were not directly in the NR setup.  I also remember the (unlikely seeming)
connection to AGC settings.  This caused no end of trouble.  Some people
have fixed their issues and others are just refusing to even acknowledge the
discussion - indicating their disagreement with the very idea by these
passive-aggressive means.  Still others tell me I have no right to even talk
about it - not owning all the equipment.

When someone who remembers this steps forward, we will get some light shed
on this again.

Regards,

Gary, AA2IZ




----- Original Message ----- 
From: "Merle Bone" <merlebone at charter.net>
To: <tentec at contesting.com>
Sent: Wednesday, March 21, 2007 10:59 PM
Subject: [TenTec] Orion Noise Reduction Ability


> Gary (AA2IZ) said:
> "I'm not the one to ask....so consult the archives.  As I remember there
is a
> strong interaction with other settings....I think it was AGC hang or
> something, that drastically messed up the NR if these other settings are
not
> correct.  But if they are correct, then all is well.  This of course
> accounts for widely different experiences with it."
> --------------------------------------------------------------------------
----------------------------------
> Gary, I've followed this reflector for quite a while - since the Orion was
first released - but I don't think I know the story you are referring to.
Grant's comment about the interaction of the "front-end bandpass" and the
effectiveness of the noise blanker has been discussed here.
>
> NR action does depend on the signal strength, the band characteristics of
the signal, the bandwidth setting of the IF pass-band and the setting of the
NR knob. Also, the NR code has been changed "significantly" over time (See
the archives). There was also a long discussion of what people "theorized"
was going on in the NR algorithm. Some people find different versions - and
there have been very different versions - more or less helpful. I think the
effect of this "tool" is "at the margin" in terms of improved signal to
noise improvement. But it may make using the rig "more pleasant" or "less
tiring" depending on the mode and the release of the code you are using and
your own preferences. I suspect the evaluation of the "usefulness" of NR
depends more on what individual expectations (subjective observations) are
rather then what really happens to the signal to noise ratio of the signal
in the IF pass-band.
> 73, Merle - W0EWM
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