[Elecraft] Help with IF Noise, DSP Noise, NR settings

[W2xj]

Looking at the MECC map, I’m pretty sure the 500 KV line is +- 500 KV DC so that would by itself make it pretty quiet. 

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> On Jun 15, 2019, at 7:34 PM, Fred Jensen <k6dgw at foothill.net> wrote:
> 
> I have never found a noise blanker to be of particular value, if any at all, on general power line hash [the "grass" along the baseline of a panadapter.  At our prior home in Auburn CA, I had a 3-phase ~70 KV transmission line on  running across the lower end of the property that connected a series of hydroelectric plants above and below us, and two 3-phase 112 KV transmission lines on towers about 1/4 mile away.  The 70 KV line was essentially quiet.  The 112 KV lines was perhaps S3-4 on 80 and had a fairly high frequency sound ... I guess from the 3-separate phases with peaks occuring at 360 Hz.  The K3 NB was ineffective against it.  With the level set high enough to affect the noise level in the headphones, SSB was highly distorted and CW was chopped up.
> 
> Here in NV, we are about 1/2 mile from a 500 KV 3-phase transmission line connecting a power plant in Patrick NV to someplace up in OR, probably along the Columbia.  It is fairly quiet, S2-3 on 80, and again seems to be high frequency enough that the K3 NB is ineffective.  I've concluded that, while technically it all is impulsive [arcs on voltage peaks], the peaks must overlap enough and/or are of a high enough frequency that the NB either can't find them or punches too many too big holes in the signal.  It might be more effective on noise from a single phase line, don't know.
> 
> I rarely hear ignition noise from spark plugs anymore, however the landscape maintenance crew showed up earlier this spring to aerate and de-thatch the grass.  Their aerator gizmo had an old 7 HP engine with strong ignition noise.  The NB took all of it out just fine at very low settings.
> 
> 73,
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
> 
>> On 6/14/2019 11:33 AM, Bob McGraw K4TAX wrote:
>> David et al;
>> 
>> My statement is almost word for word from the Elecraft K3 manual.   And some from work done by Art Collins and company at Collins Radio.  They prescribed the function of a Noise Blanker as follows:
>> 
>> "The following operational requirements were kept in mind:
>> 
>> 1. Reduction of ignition noise from vehicles.
>> 2. Reduction of power line corona noise occurring at 120 CPS repetition
>>    rates.
>> 3. Reduction of local thunderstorm disturbances.
>> 4. And, in genera