[Icom] External Audio Filter

[George, W5YR]

Doc, your experience causes me to wonder if your NIR-12 was not having a
problem. Mine always has been instantly effective on removing heterodynes
completely. Neither do I notice any sensitivity in the control settings or
distortion as long as the audio input does not cause the overload LED to
light up.

Like you, that is my biggest use of it was on SSB with my 765. However,
since getting the Icom PRO, I find that its DSP notch filter is superior
even to the NIR-12, as is the noise reduction.

Glad you ended up with a unit that you like and does a good job for you.

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
  

doc wrote:
> 
> I have owned both and found the DSP-599zx to be superior in
> every way.
> 
> I sold my 599zx and bought a NIR-12 because I was told that
> the NIR-12 was superior in SSB applications, my experience
> did not bear that out and I sold the NIR-12 at a significant loss
> and acquired a 599zx once again.
> 
> One of the neatest features of the 599zx is the automatic removal
> of the bane of HF, lids keying up on top of QSO's.  The NIR-12
> was not only unable to get that done it alos added too much
> distortion to the signal and was hypersensitive to the slighest
> tweak.
> 
> Anyone aware of a small and simple dsp audio processor that
> removes heterodynes like the 599zx?