K1 KNB1 Question

[Dwight N4GSD]

Group,

Had a question about the opperation of the noise blanker in the k1. When
turned on 'low' it almost sounds like an am radio station in the background
noise. Do not notice this on 'high' or when the noise blanker is off.

K1 #382 ,2 band, auto tuner

Dwight N4GSD

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[Ron D'Eau Claire-2]

Noise blankers "punch holes" in the signal by turning the I.F. amplifier On
and Off. Hopefully it's off during the noise pulses.

That works really great for killing noise pulses when they are regular
enough for the system to anticipate when the pulses occur.

However, turning the I.F. amplifier On and Off like that makes it a pretty
dandy "frequency mixer" too! That means that many strange artifacts can show
up in the receiver passband as various strong signals - sometimes signals
way off frequency - mix together in the I.F. amplifier.

That's likely what you are hearing. And it's why Elecraft recommends having
the noise blanker On only when it's really needed.

Ron AC7AC

-----Original Message-----
Group,

Had a question about the opperation of the noise blanker in the k1. When
turned on 'low' it almost sounds like an am radio station in the background
noise. Do not notice this on 'high' or when the noise blanker is off.

K1 #382 ,2 band, auto tuner

Dwight N4GSD


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[Larry Makoski W2LJ]

Dwight wrote:

>Group,
>
>Had a question about the opperation of the noise blanker in the k1. When
>turned on 'low' it almost sounds like an am radio station in the background
>noise.
>
Dwight,

I've noticed the same thing with mine.  I always thought it was just me.

73 de Larry W2LJ
http://www/qsl.net/w2lj

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