[Elecraft] [K3] Noise Reduction Recording

[Trevor Smithers]

> is this just broadband hash
>in my urban neighbourhood from er, broadband and wall warts etc?
Yes, also known as frying bacon/eggs, atmospheric qrn, call it what you will. 

The cure is a separate receiving antenna. For a fairly convincing demonstration of the Wellbrook 1530 
loop in action on 160 listen to this
http://www.wellbrook.uk.com/G0BDE/

Personally I have never found any NR implementation (from any manufacturer) to be very effective on 
audio signals and completely agree with Shaun's comment
>one of the things with noise 
>reduction I've found is that it tends to detract some from the original 
>quality of the audio you're trying to weed out from all that noise as 
>well and in many cases, apply too much and everything's in the mud. 
>audio and all.

What you really need is a method of identifying the actual ssb speech waveform, extracting the noise 
from it leaving the signal in the clear. There is a company in Germany that produces an outboard unit 
that I find very effective without the degradation in the audio. Audio demo here  
http://www.home.vrweb.de/michels/sound_demo.htm

I use a pair of their DX-21 kit modules and feed the left/right stereo output into each one so I get 
independent NR control of each channel. 
There is an Eham review here  http://www.eham.net/reviews/review/43017

By using a pair I also retain the audio fx and binaural I-Q. 
You would need to contact the company about the availability of the DX21 modules as I see they are no 
longer shown on the site.

I find the combination of a receiving antenna (I use a rotatable 1530 loop) and the outboard noise 
reduction very effective on 80/160 grey line SSB weak signal work for instance.
 
Anyway, something to think about.

73 to all
Trevor  G0KTN