[ICOM] RE: Good effective noise blankers

[Max Harelik]

TimeWave. Nothing better. It's not "in the box", but it works.

73,
Max, k5ovw


mel martin wrote:

>Difficult question to answer... Especially since most "reviews" I've read
>are from people trying to eliminate types of noise they are really not
>designed for. I've found the blankers in all Icom's I've used good with real
>pulse noise such as ignition noise or my neighbors fencer.
>
>For example, with the 746Pro, the NB works perfectly for the fencer...
>Taking it from S8 to zilch with the NB level set to *zero*. Same with the
>781... I normally set it for narrowest width and lowest level... Though the
>lowest level isn't low enough... It will cause IM in some extreme
>circumstances... Though I generally leave it on. Previous rigs such as the
>765 and 751 as well as some older ones also worked well.
>
>Increasing the level on the 746Pro causes it to have some effect on less
>well defined spikes, such as some power-line noise.. But intermod becomes a
>problem.
>
>An illustrative story: When Yaesu first introduced the FT-One... It had an
>amazingly good blanker... It took out ignition noise, motor bush noise,
>fencers and some types of power-line noise... And I never heard it cause any
>IM...
>
>However Yaesu got a lot of complaints that the NB "didn't do anything"... So
>they "improved it" by lenghtening the time constant of the differentiator
>and blanking stage. It now did "something" on more kinds of noise... But you
>could longer leave it on due to IM.
>
>  
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