Topband: DSP and Noise Blankers

[Tom Rauch]

> This brings me to a question about the FT1000 MP MK V 
> Field that I am using:
>
> Last season I found that using the DSP noise reduction and 
> the 250Hz crystal
> filter from Yaesu gave best signal to noise.
> (or using the narrowest setting of the DSP filter with the 
> 250 hz crystal
> filter in the IF.)The  500Hz 455KC mechanical filter 
> Collins that I also
> installed is hardly used on 160m.

One thing to remember is the more stages and the narrower 
the filters that noise and signals pass through, the more 
difficult it is to separate rough or sharp noise from 
desired signals. Viewed through a narrow filter they all 
start to look the same.

I don't like the Collins mechanical filters when picking 
signals from noise. I prefer conventional crystal filters at 
~500Hz BW. I haven't looked to see why that is, I just buy 
different filters. Inrad has some good filters.

73 Tom