[TenTec] Orion II NR Performance Measurements

[Grant Youngman]

I won't bore you with the setup here, but will be happy to provide details
to anyone who is interested.  Consistent results were obtained by two
independent methods: (1) graphical computation of SNNR, and (2) spectral
analysis software that directly computes an estimate of SNR.

The results are as follows (LCW, 1000Hz spot tone, NR=9)  

BW=3000Hz: SNNR improves by approx 1dB with NR=9.

BW=500Hz:  SNNR degrades by approx 2dB with NR=9.

There is improvement at 3 Khz bandwidth, but it's negligible.  At 500 Hz
(and anything below that as well) you're better off without NR at all.  The
distortion created by NR at any bandwidth in both CW tone and SSB voice is
very unpleasant compared to typical noise reduction products. 

Even without having a v1 Orion to compare with I'm basically moving from the
"uncertain" bench to the "put it back the way it was" bench.

Grant/NQ5T