[Elecraft] K3 noise blanker & 6 meters

[K7WIA]

I use my K3 only for 6 meter work, but I have been unhappy with the
performace of the noise blanker for pulse spikes.

no matter how I adjust the DSP or the IF blanker I cant seem to bank out the
pulses.

I can take out the power line type buzz but not the sharp spikes

When playing with the IF adjustments and I increase it to NAR-7 with the DSP
OFF my S meter goes from S3 to S6 and the backkground noise increases and
sounds almost like intermod.

When I turned my antenna all of a sudden the noise level dropped to S3 my
normal background level.

I tuned down band a found 3 very strong signals,S9+40 (baby monitors) 49.830
49.870 & 49.890

It seems the IF blanker samples signals before the filters and therefore
look at a very large sprectrum.

and it appears that those strong down band signals overload the blanker...

I turned my antenna and peaked the monitor signals, then tuned up band, when
I got to 50.450 the overload went away. which is 600KC above the interfering
signals.

The bad part is if I turn my antenna to where I don't have the overload my
antenna will be stuck on JA land... not much good this time of the cycle
when you live in Seattle

It would be nice to be able to keep it pointed at Florida but that right
where the interferences is the worse.

don't know of the DSP code can be modified to incorperate pulse type spikes
or not..

　

Ed K7WIA

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