[ICOM] Pro 3 noise reductiion

[Adam Farson]

Hi Howard,

There is no separate chip for the NR; it is a process within the DSP
algorithm. The DSP chip, or some other part on the DSP Unit, may be
defective.

I can confirm your findings that the NR is greatly improved in the Pro3 vs.
the Pro2.

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Dr.Howard S. White
Sent: 13 August 2005 23:50
To: ICOM Reflector
Subject: Re: [ICOM] Pro 3 noise reductiion

Jeff:

I never copy CW so I am of no help there...

But  in a side by side test on SSB and even on digital, I found the NR to be
significantly more effective on the Pro 3 vs Pro 2

I am near the top of a mountain near a lot of commercial towers (94 total).
So I am in a very high ambient noise environment.  Without NR, I would not
be able to make most of my DX contacts.  I found I could copy DX on the Pro
3 with NR where they were uncopyable on the Pro2 due to the ambient noise...
so it works very well...

I suspect that you might have a defective NR chip...

Howard KY6LA


----- Original Message -----
From: "Jeff Frank" <jafrank at nyc.rr.com>
To: <icom at mailman.qth.net>
Sent: Saturday, August 13, 2005 10:40 AM
Subject: [ICOM] Pro 3 noise reductiion


I'm having a hard time finding any use for the noise reduction control on my
Pro 3.  It's not helpful to me under practically any conditions when I'm on
cw and I'm not crazy about it's usefulness on ssb. One of the reasons I
bought the Pro 3 was because the noise reduction was supposed to be improved
over the Pro 2. The earliest product reviews on e-ham.net include reports on
how much improved the NR is, and how happy people are with it. I never had a
Pro 2 so I can't say anything about the comparison. Maybe I'm not using it
correctly or maybe there's a problem with my rig. I find that unless a cw
signal is relatively strong (s-5 or better) the NR control distorts the
signal and makes it rough sounding and HARDER to copy. If the signal is
weak, near the noise, using the NR distorts it into unreadability and I can
copy it better without the NR. And if the signal is stronger, I don't need
the noise reduction anyway. If I keep the NR setting below about 9:00, it
does make a little positive difference but I don't feel overall it's doing
very much. I don't operate much ssb, but when I have used it, it just seems
to take the highs out of whatever noise there is, and I could do that with
any decent audio filter. I would be very interested in hearing what other
people's experience with the NR on the Pro 3 is so I can try and make an
educated guess as to whether or not there is anything wrong with mine. If
anyone is getting good results with theirs, please let me know what your
settings are and under what kind of band conditions. And if anyone had the
Pro 2 before the Pro 3 I'd sure like to hear how the Pro 3 NR is an
improvement over the older model.  Thanks very much.

Jeff KX2P
----
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/

----
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/


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