[Orion] Re: [1000mp] Mark v compared to the Orion + EnhancedS/N at Narrow Filter Bandpass + Audio DSP

[Steve Baron - KB3MM]

----- Original Message ----- 
From: "Joe Giacobello" <k2xx at swva.net>
To: <tentec at contesting.com>
Cc: <orion at contesting.com>; <1000mp at mailman.net>
Sent: Monday, April 19, 2004 18:00
Subject: Re: [Orion] Re: [1000mp] Mark v compared to the Orion + EnhancedS/N
at Narrow Filter Bandpass + Audio DSP


> OK, Chas.  I already commented to an earlier respondent with a similar
> opinion, but I wanted to mention a couple more things things.
>
> I have installed all of the available roofing filters in my Orion.
> There was an article several years ago in QST about enhancing S/N ratio
> by using narrow filter selectivity and adjustment of RF gain.

I always figured that if reducing RF gain makes things better the
real problem may be overlaod of some stages i.e. one gets an impovement
in apparent ig to noise.
  I had

> been using both of those techniques for many years, but had never heard
> a reasoned, technical explanation for why it works.  On the other hand,
> I have read comments from other competent, experienced hams that have
> said that the article was essentially "hooey."  Despite their comments,
> I cannot be emphatic enough when I tell you that I can bring weak CW
> signals strikingly out of the mud by merely cranking down on the BW
> control on the Orion.  The effect is quite dramatic.  (I should also add
> I can usually obtain similar performance from the MP, but it requires
> utilizing both narrow selectivity, RF gain adjustment and the audio DSP.)
>
> I am also comparing the Orion NR performance against a JPS NIR-12 on the
> audio output.  There is no doubt that the Dynamic Peak feature on the
> NIR-12 improves S/N and copyability even when the Orion's NR is
> activated.  You may want to hang on to your outboard audio DSP unit, if
> you have one.
>
> I'd be interested in hearing other comments on these observations.
>
> 73, Joe
>
> Charles Fulp wrote:
>
> >My mkV is on the shelf for now... with INRAD filters...it was fine, but
the
> >Orion rcvr is better under heavy QRM conditions.
> >every day use, not much difference, and the MK V may be more user
friendly.
> >You are buying the ability to hear stuff under the heaviest of
> >QRM (DX pileups and contests mostly)...so far the Orion is the best thing
> >you can get...but you have to be real fussy for it to matter once
> >you get into the MP class etc.
> >
> >73 Chas K3WW
> >
> >
> >----- Original Message ----- 
> >From: "Joe Giacobello" <k2xx at swva.net>
> >To: <1000mp at mailman.qth.net>
> >Cc: <orion at contesting.com>
> >Sent: Saturday, April 17, 2004 14:12
> >Subject: [Orion] Re: [1000mp] Mark v compared to the Orion
> >
> >
> >
> >
> >>I am in the midst of comparing my vintage MP vs. my Orion, but I am
> >>reluctant to make any final conclusions until I'm confident that I've
> >>mastered the proper use and interactions associated with the AGC and RF
> >>gain settings.  My comparisons will be primarily on CW.  My preliminary
> >>impressions are that the MP compares quite favorably with the Orion on
> >>sensitivity and copyability of weak CW signals on 30, 40 and 80M.
> >>
> >>I haven't really reliably compared selectivity.  My MP has all the
> >>available stock Yaesu filters.  At this time my subjective sense is that
> >>the Orion may have an edge here, but I don't have any KW signals across
> >>town to contend with.
> >>
> >>73, Joe
> >>
> >>n3drk wrote:
> >>
> >>
> >>
> >>>What are latest results of the comparisons of these two rigs? Have not
> >>>
> >>>
> >seen
> >
> >
> >>>anything in awhile and was wondering if any further research has been
> >>>
> >>>
> >done.
> >
> >
> >>>Thank You
> >>>
> >>>john
> >>>
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> >
> >
> >
> >
> >
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