[Icom] External Audio Filter

Wed, 6 Feb 2002 13:27:33 -0000

> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of George, W5YR
> Sent: Wednesday, February 06, 2002 12:28 PM
> To: [email protected]
> Subject: Re: [Icom] External Audio Filter
> 
> 
> 
> 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