[Yaesu] FTDX 3K Noise Blanker Operation

[Dr. Gerald N. Johnson]

Unfortunately that is how the noise blanker works. It has to sample 
signal before the narrow filters and then when it detects a fast rising 
signal envelope it cuts a hole in the signal. Unfortunately where there 
is more than the desired signal in that wider passband it chops a hole 
in that other signal and that spreads splatter across the wide passband. 
If you tune to that other signal generally you will notice it is spread 
like the transmitter is splattering from over drive. The noise blanker 
does that.

You might be able to help it by adding front end attenuation to reduce 
the signal strength of the signal outside your receiving pass band. Or 
in my FT-857D the DSP noise reduction scheme may work on the line noise 
with the blanker turned off. I haven't tested that but on 10 GHz I do 
find the DSP noise reduction does help extract weak signals from circuit 
noise.

Electronic ballasts on fluorescent and LED lamps can be very nasty noise 
sources worse than power line noise. I have heard power line noise 
sources that were audible under the pole and called the power company 
about that arcing they did fix it.

It might take a complaint to the FCC to catch their attention.

73, Jerry, K0CQ

On 1/13/2017 2:22 PM, Tom Greenwood wrote:
> Hoping somebody on the group may have some words of wisdom.  I am operating
> a FTDX3000 from my shack but the power line on the pole across the street is
> arcing and sparking terribly in this cold dry winter air causing huge static
> bursts.  I can quell it quite a bit with the noise blanker in wide mode but
> as soon as I receive anybody within about +/- 20 kc of where I am listening,
> the static comes back through regardless of how I set the noise blanker.
>
>
>
> Short of sawing the pole down, anybody have any insight into ways with the
> 3K to improve its rejection of this nuisance?  I've been chasing the power
> company for 9 months to resolve and they claimed they did but obviously not
> correctly.  Time for some calls.
>
>
>
> Many thanks
>
>
>
> Tom Greenwood, N1JQB
>
> Sudbury, MA USA
>
>
>
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