[Elecraft] K3 NB Generates noise

[Ed Stallman]

Fred , N5GE and Guy , Thanks all very good explanations and great 
advice . I am using FW 4.51 and I believe it's good improvement . I 
have the IF NB turned back and am hearing some weak signals on 6m . 
just worked CT1HZE .

Ed





At 05:10 PM 7/18/2012, Fred Jensen wrote:
>Ed,
>
>First off, make sure you are running the latest production firmware.  It
>made some major improvements in the NB and NR functions.
>
>The very nature of any noise blanker will distort the signal and using
>it is a trade-off between that distortion ... which sounds a lot like
>"noise" ... and the real noise mixed in with the desired signal.  The NB
>literally punches holes in the signal during noise pulses.  As you go to
>higher numbers, the blanker gets more aggressive, and typically, the
>distortion increases.
>
>The NAR, MID, and WID settings determine the width of the "holes."  For
>example, our electric fence periodically starts "ticking" when weeds
>grow up under it in the spring.  The noise pulses are very narrow, and a
>NAR-1 or NAR-2 setting takes them totally out and does not introduce any
>distortion that I can hear.  A higher NAR setting seems to take them
>out, but replaces them with the distortion from the holes in the signal,
>which sounds a lot like the original noise pulses. :-)
>
>73,
>
>Fred K6DGW
>- Northern California Contest Club
>- CU in the 2012 Cal QSO Party 6-7 Oct 2012
>- www.cqp.org
>
>On 7/18/2012 2:28 PM, Ed Stallman wrote:
> > I finished K3 Kit 6644 yesterday and noticed today when using the NB
> > on 6m that it the NB will generate noise only on a few different
> > levels ! With NB Level on then DSP set to off .. I now turn
> > IF-NAR  from off  through the numbers 1 to 7 ...when I get to
> > IF-NAR  6 and 7 it is much noisier then 2,3,4, or 5 with 4 being
> > best  ! Is this normal ? I was thinking the higher numbers would
> > reduce more noise ? Using IF-MID and WID 1 has more noise and 7 is less
>
>
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