On 9/3/2017 9:18 AM, K9MA wrote:
I have never found the K3 noise blanker to be effective.
<SNIP>
BTW, the K3 noise blanker uses a filter with a bandwidth of about 100 kHz.
<SNIP>
The K3 NB is really TWO blankers, operating in two different IFs. Each
can be tweaked for various kinds of noise from the menu system. Access
the menu by a Long Push of the NB button.
It's important to understand that there are many kinds of noise. Noise
blankers are most effective on IMPULSE NOISE, which is the result of
something arcing, usually in the power system, but also electric fences
and neon signs.
Most of the residential noise we hear today is ELECTRONIC noise,
generated by switch-mode power supplies and microprocessors. Noise
blankers must be very different to suppress this sort of noise. The menu
tweaks provided by the K3, K3S, KX3, and KX2 are very critical to making
the NB effective on the noise you're experiencing. One size does NOT fit
all.
73, Jim K9YC
On Sep 3, 2017, at 10:37 AM, Rick Tavan<[email protected]> wrote:
Noise blankers are difficult to design and to use. They work by blanking
out the receiver during noise pulses. The user defines what is a noise
pulse and how aggressively to blank it by adjusting the NB parameters.
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