KNB2 performance

[Marinos]

In general less than stellar performance of the KNB2 circuit in some cases depends on the type of pulse noise that someone tries to eliminate and not to dysfunction of the board itself.
It is true that the KNB2 tends to be "picky" on the type of noise that it is most effective against, but for 90% of the time at least in my current QTH, it does not compare favorably to the NB in other rigs.
As for an objective test for the "ideal" NB, someone can easily have it by operating a TS830 (in good alignment status) side by side with his/her K2.

We still love our K2s in fact we love them enough that we like them to have the best possible (analog) performance. This rig has been designed and built with the serious Rx performance in mind from the start, and certainly several weak points have been "ironed away" since its introduction, so there is absolutely no reason why the NB area should be an exception.

Marinos, ki4gin
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[John Huffman]

I'm in a noisy city environment.  The KNB2 works 70% of the time.  Without it I
couldn't operate.

I have found that messing with the pre-amp and attenuator sometimes gets it to
work.

Also, I can only remember a few times when high or low threshold made a
difference and only once where NB1 vs. NB2 made a difference.

The NB2 is adequate most of the time.  I built my K2 to have one of the very
best receivers available, regardless of price.  For low power draw and
portability, the K1 and KX1 fit the bill nicely.  But, the prime draw of the K2
is it's top performance.

It would be great if the NB2 could be brought to that standard.

73 de NA8M
John

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[hank k8dd-2]

 From sitting at my desk with 2 K2/100's and an IC-746 .... and an
IC-706MKiiG in the truck .....
It seems that noise blankers in general .....
     Work sometimes
     Don't work sometimes
     degrade signal quality sometimes
     don't degrade signal quality sometimes
Coupled with (or without) a combination of pre-amps, attenuators, DSP
noise reduction and / or the DSP filters ...... You could even add one
of those noise reduction boxes that use a sense antenna.
You might get rid of the noise.  Or .... you might not!

The KNB2 works real well for a $40 noise blanker.  How many would be
willing to pay several hundred dollars for the noise blanker that I'd
bet Wayne could have designed?

But it's just like paddles, cars, wives and cold drinks ..... one
size/type/model doesn't fit all.  I could say "use what works", but that
may not be politically correct in this case - so I didn't!

73    Hank    K8DD


John Huffman wrote:

> I'm in a noisy city environment.  The KNB2 works 70% of the time.  
> Without it I couldn't operate.
>
> I have found that messing with the pre-amp and attenuator sometimes
> gets it to work.
>
> Also, I can only remember a few times when high or low threshold made
> a difference and only once where NB1 vs. NB2 made a difference.
>
> The NB2 is adequate most of the time.  I built my K2 to have one of
> the very best receivers available, regardless of price.  For low power
> draw and portability, the K1 and KX1 fit the bill nicely.  But, the
> prime draw of the K2 is it's top performance.
>
> It would be great if the NB2 could be brought to that standard.
>
> 73 de NA8M
> John

--

*/    Hank Kohl K8DD                      [hidden email]
*/

If God intended you to be on single sideband, he would
have given you only one nostril.
                                  Steve, K2PTS </b>(SK)
                                   
'Never argue with an idiot. They drag you down to their
 level then beat you  with experience.'           -anon



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