Remember one thing about the optional filters. You will still have
sharp DSP filters with the standard filters. The optionals will just help
the very close in dynamic range. The standard filters are 6 khz, 2.4 khz,
and 1 khz. With the standard filters, the close in dymnamic range will
be great up to 1 khz away. If you add the optional 250 hertz filter,
what you are doing is improving the close in dynamic range spread to 250
hertz.
I don't know what the untimate rejection will be for the DSP filters, but I
expect at least 60 db. So, with no optional filters, as long as there is no
more than 60 db difference between two signals 100 hertz apart, you should
be able to separate them with no interference between them. For signals
more than 1 khz apart, you should be able to separate signals that have more
than a 100 db difference (a guess on my part).
Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: "Jim Miller" <k4sqr@juno.com>
To: <w5yr@att.net>
Cc: <res0wsci@verizon.net>; <jimr.reid@verizon.net>; <tentec@contesting.com>
Sent: Monday, June 10, 2002 9:58 AM
Subject: Re: [TenTec] Fw: [TenTec_Orion] Orion at HamCom (Arlington Texas)
> The optional filters are now $109. each and have been noted as an
> available option from the beginning, to supplement the DSP filters.
>
> Cheers,
> Jim, K4SQR
>
> On Mon, 10 Jun 2002 00:53:04 -0500 "George, W5YR" <w5yr@att.net> writes:
> > Bill, the rig comes with three IF crystal filters and you need three
> > more
> > optional filters to round things out. Add to that a power supply,
> > mic, fan,
> > antenna tuner, etc. and this is no longer a $3300 investment.
> >
> > I would spec the filters at $130 - $150 each.
> >
> > Although the Orion uses DSP IF operation, it retains conventional
> > IF
> > crystal filters to "improve close-in signal rejection." Three of the
> > six
> > filters are provided; the remaining three are "optional."
> >
> > 73/72/oo, George W5YR - the Yellow Rose of Texas
> > Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> > Amateur Radio W5YR, in the 56th year and it just keeps getting
> > better!
> > QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK
> > 11735
> > Icom IC-756PRO #02121 Kachina 505 DSP #91900556 Icom IC-765
> > #02437
> >
> >
> > "William F. Mansey; WA2PVK" wrote:
> > >
> > > Thanks Dennis,
> > > This all sounds very interesting and very promising BUT what
> > was that
> > > bit about optional filters? I thought the whole idea was to
> > eliminate those
> > > filters! This IS after all a DSP rig is it not? Am I missing
> > something
> > > here? I may have misunderstood, or missed, something because I
> > seem to
> > > recall something about not having to buy expensive filters.
> > Please clarify
> > > this for me. My desire to buy an Orion is still there but the
> > "burning" has
> > > begun to turn to smoldering! $3300.00 rig and OPTIONAL
> > filters???
> > > :-( 73; Bill, WA2PVK
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
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