Dick,
The KNB2 works well on impulse noise such as automotive ignition noise
or the impulse noise from lightning storms. However, it will not do
much good on the more constant noises like atmospheric noise or
power-line noise because that is more constant and slow in rise time.
The KDSP2 does a good job on those latter kinds of noise.
There may be nothing wrong with your KNB2.
73,
Don W3FPR
On 2/26/2011 4:24 PM, Barnett, Richard H wrote:
> Hi,
> Newbie question: I just finished my K2 and am slowly getting the options done and installed. My QTH has about S6 or so of power line pulse noise (especially noticeable on 80M) so I got the noise blanker. It is done and installed.
>
> Based on previous radios I expected turning it on to make some noticeable difference in the received audio. I can tell absolutely do difference at any setting (lo or hi th, NB1 or NB2 or off). There also is no difference in the noise on 80M. I can currently only discern about 2 SSB signals on 80 - seems like way too few, but who knows?
>
> I have checked the parts, the voltages (which are switching as designated on the schematic) and if I set to lo-th, I do see pulses applied to the base of the gate transistor. But no noticeable difference in the sound.
>
> Any thoughts or experience will be appreciated.
>
> 73,
> Dick, n9np
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