[Elecraft] K4HD question

[K9MA]

On 5/29/2019 20:57, Fred Jensen wrote:
> Noise blankers were designed for repetitive impulse noise, the largest 
> former example of which was ignition noise from vehicles.  They have 
> not ever been very effective against power line hash which tends to be 
> non-impulsive and highly random. 

That has not been my experience. Most line noise IS impulsive, and some 
noise blankers can be quite effective, but only if there are no strong 
signals nearby. I'm hoping a direct sampling receiver could avoid that 
problem. One method that has been used in the (distant) past was a 
second receiver tuned to a nearby but clear frequency to control the 
noise blanker. It seems that a direct sampling receiver ought to be able 
to do something like that.

73,

Scott K9MA

-- 
Scott  K9MA

k9ma at sdellington.us