[TenTec] rambling questions

[Duane Calvin]

Welcome to DSP.  I have an NIR-12 and it is noticeably better than the NIR-10.
The 12 has dual DSP modes, and I tend NOT to use the NIR mode due to time delay
(doesn't work well with QSK CW - hi!).  In the "dynamic peaking" mode
(essentially the same as Timewave's DSPxxx series "random noise"), the NIR-12
beats all the Timewave including, arguably, the DSP-599zx.  It has the second
mode, NIR, that can be kicked in on top of the other, but it must be used
judiciously due to the audio artifacts that are induced when the level is
increased beyond the 9 or 10 o'clock position.  The NIR-12 also has an
effective audio bandpass filter with brickwall edges - if you don't have IF
selectivity built into your Omni-VI, then put your money there first!

All of that said, I've not even hooked my NIR-12 up to my 10 month old Omni-VI+
yet.  The Omni's DSP is quite good about 75% of the time.  For the remaining
25% I wish I had the NIR-12 set up for random noise reduction as it seems to
handle a somewhat wider range of noise types.  Would it be worth purchasing for
an Omni-VI+ owner?  I'd guess no, but your mileage may vary.  It always pays,
with DSP units, to borrow one and try it out first.

 73,  Duane    AC5AA

Duane A. Calvin
Server Systems Test Engineer
Dept. 76TS   RS/6000 - SP Nodes
Austin, TX      >O<     Tie: 793-3368



owner-tentec@contesting.com on 07/29/98 11:12:12 AM
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Subject: [TenTec] rambling questions



Anyone here use the Timewave or the JPS DSP?  I had a Timewave
59+ for a while, and I just got an NIR 10 with version 4 installed.
Neat toys, but the audio artifacts and distortion drive me absolutely
batty.  I find the DSP in my OMNI VI to be basic and restricted, but
the darned thing works well enough that I use it on occasion.  I
find the NIR 10 just annoys me so far.  Well, the bandpass function
for CW is not too bad, but there is a light "motorboating" on all
the leading and trailing edges of the CW signals while it filters.
The SSB "noise reduction" does indeed reduce certain kinds of noise,
but ADDS others.  I hear all sorts of odd junk as the processor
decides what parts of the signal to keep and what to throw.  Aaaaack.
I have spoken to one other guy who tells me that he notices this
stuff, too.

I have my beloved Corsair I and was hoping I could add this to it
and improve the CW selectivity.  Ha.

Another rambling question.  Anyone notice that the OMNI-analog
must have been the OMNI I, the OMNI-digital was the OMNI II, the
Corsair I must have been the OMNI III, the Corsair II, the
OMNI IV.....is this how the OMNI V got its name?

Clark
WA3JPG

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