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
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
> _______________________________________________
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>
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