[Icom] External Audio Filter

[George, W5YR]

Mike, I guess you are asking me about which feature I thought was "better."
In the comment you quoted, I said only that the NIR-12 and the Timewave
unit were comparable, not which was better, since I have not directly
compared the NIR-12 with the Timewave unit as you have. 

My comment was based upon the fact that at the time the NIR-12 came out, it
was the only unit on the market that could execute all functions
concurrently. All other units were a filter or a notch filter or noise
reduction, but usually only one at a time. I seem to recall that one unit
could filter and notch concurrently, but all its computing horsepower was
required for noise reduction. Having dual processors is the merit of the
NIR-12 as I see it.

So, that was the basis for my claim of superiority for the JPS unit.

Since they are no longer in the amateur market, it is good to know that the
Timewave unit works well and is still in production. I understand that the
Timewave also does a number of functions that the NIR-12 does not and
doubtlessly that adds to its superiority.

Thnaks for the update!

72/73/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
Icom IC-756PRO #02121  Kachina #91900556  IC-765 #02437

All outgoing email virus-checked by Norton Anti-Virus 2002
 

"Michael P. Olbrisch" wrote:

> > I believe that the most nearly comparable currently available
> > new unit approaching the NIR-12 is the filter made by Timewave.
> > I do not recall the exact name but it is something like the
> > DSP599X.
> 
> That is an interesting comment.  I had both side by side for a
> while, and found the DSP-599zx to be the better unit.  Although
> the NIR-12 is no longer here, I believe the latest DSP-599zx
> upgrades would make it a far superior choice when coupled to
> my IC-781.  When correctly adjusted, The DSP-599zx edged
> out the NIR-12 even back then.
> 
> I find it not only useful for my IC-781, but I use it's second input
> on my IC-820H.  It is quite helpful in reducing the noise on the
> AO-40 satellite S-band downlink.  I have set it up on my 900 MHz
> headphones, so I get the IC-820 audio on the left side, and the
> IC-781 audio on the right side.  (The DSP-599zx has two separate
> inputs).  I set it up so the AUX input (easily switchable) is 15dB
> down from the primary input.  That way, when I am listening to
> AO-40, I can keep the H.F. radio in the background, but still hear
> the net.  Likewise, I can work H.F., but still hear the V/UHF quietly
> in the background.  In fact, a friend and I compared my IC-781
> with the DSP-599zx to his then new IC-756.  Other then the
> aforementioned AGC affect, we saw no reason for me to sell out
> and get an IC-756.  Now before we start... it was NOT A PRO or
> a PRO-II.  Have not tried that comparison... has anyone?
> 
> Which feature did you think was better on the NIR-12?
> 
> Mike.  KD9KC
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-- 
72/73/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
Icom IC-756PRO #02121  Kachina #91900556  IC-765 #02437

All outgoing email virus-checked by Norton Anti-Virus 2002