I have had both Orion models and believe there is some small audible difference.
For my Orion fw 1.375b, using the 600Hz Inrad crystal filter at the 1K pos, I
very much like its 100Hz (actually it is about 155Hz) for reading the weakest
signals on 160m. CW. The OII using fw 3.XX and 4-pole 300Hz, offers a slightly
tighter DSP filter.
The ORION is the only RX for which I can manually (VFO)scan the 160m band at
100Hz DSP BW, totally ringing-free and not missing any tiny CW signal. Normally
you would scan the band at wider BW for sure and I often forget to return to
200-400Hz BW when scanning the band. It is THAT good. I "blame" the Orion's
ability to read weak signals so well because of their 'analog shaped' DSP
filtercurve.
See filter-curves
at: https://www.flickr.com/photos/pa5mw/sets/72157632258734283
Here you will find sound curves 0-2000Hz showing 300Hz set filter curves for
the TS590, IC746(2x400Hz crystal without and with DSP-Wide), OII, Orion and tow
different K2's at 400Hz without and with 120Hz analog APF
73
Mark, PA5MW
> Op 26 maart 2018 om 11:31 schreef Barry N1EU <barry.n1eu@gmail.com>:
>
> The only thing the xtal filtering accomplishes in the Orion is to prevent
> overload of the ADC by off-channel signals. 4 Poles is plenty.
>
> No, the filter skirts are determined by the number of taps of the dsp
> filtering, adjustable in the Orion's menu, not by the xtal filtering.
>
> As I listed in the TenTec wiki article I linked earlier, the Orion II is
> generally a more reliable radio as they age and that's why I give it a
> slight nod.
>
> 73, Barry N1EU
>
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> On Mon, Mar 26, 2018 at 3:05 AM, MadScientist1948 <dukeshifi@comcast.net>
> wrote:
>
> > The Orion is a really great choice (either version).
> >
> > The color screen on the O2, while sort of coarse compared with the display
> > on its contemporary, the Icom 756 Pro 2 or 3, is sure a lot more pleasant
> > to use than the older monochrome displays on the O1. Also, it seems that
> > the color displays are more reliable than the monochrome ones.
> >
> > I have had maybe 10 Orion and 5 Orion 2 radios here over the years. I have
> > also repaired many of them.
> >
> > Unless I missed something, I had thought that the O2 used 4 pole roofing
> > filters while the O1 used the older 8 pole Omni 6 type filters.
> >
> > Generally, more poles provide better skirt slopes…
> >
> > Thus I would appreciate it if someone might elucidate on the reason for
> > the perception that the O2 has better filtering…
> >
> > My recollection is that Ten Tec, in their advertising for the O2 and its
> > accessories, stated that they had discovered a way to produce the filters
> > at lower cost (which was reflected in lower prices for the accessory
> > filters relative to the older filters).
> >
> > It seems to me that this “discovery” consisted mainly of using half as
> > many crystals in the filters.
> >
> > The Ten Tec’s credit, the newer filters do have shielded metal housings
> > whereas the older filters were “open air” designs, leaving some room for
> > unplanned leakage around the filters.
> >
> > Gary
> >
> > > On Mar 25, 2018, at 9:43 PM, Michael Tortorella <w2iy@verizon.net>
> > > wrote:
> > >
> > > Thank you to everyone who replied, both on- and off-list, with useful
> > > information. The consensus seems to be that performance of the two is
> > > pretty much the same, you get a pretty color display with the II and a
> > > different (maybe slightly better but not much difference in the real
> > > world)
> > > filtering system. Definitely on my short list for a new xcvr.
> > > 73
> > > Mike W2IY
> > >
> > > -----Original Message-----
> > > From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Michael
> > > Tortorella
> > > Sent: Saturday, March 24, 2018 11:04 PM
> > > To: tentec@contesting.com
> > > Subject: [TenTec] orion vs. orion II
> > >
> > > Hello everyone,
> > >
> > > I am thinking about jumping into the more modern world, and would be
> > > grateful for any comments from the list concerning comparing the Orion
> > > 565
> > > and Orion II 566.
> > >
> > > Thanks and 73
> > >
> > > Mike W2IY
> > >
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> > > TenTec@contesting.com
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> > >
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> >
> > _______________________________________________
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> >
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