Re: P3 display versus FlexRadio

Posted by Martin Sole-3 on May 13, 2018; 3:05am
URL: http://elecraft.85.s1.nabble.com/P3-display-versus-FlexRadio-tp7640821p7640826.html

I'm not all that familiar with the Flex stuff but in some SDR software
display systems it is possible to adjust the waterfall sensitivity and
contrast independent of any spectrum bandscope position adjustment. It
is often also possible to have any signal levels indicated by such
displays bear no relationship to any accurate level.The P3 waterfall
contrast changes with the reference level setting which in itself
changes with the displayed bandwidth, seems appropriate. Scale will
adjust the sensitivity I think.

In the situation I have here where it is unusual to have any signals on
any band at more than S7-8, nearest centre of any appreciable activity
is several thousand miles away so mostly fairly weak signals, in this
case I find having the waterfall in monochrome, spectrum display is
still in colour, to be quite an advantage. It is quite possible to set
an almost black waterfall with signals barely above the noise floor
showing as grey marks, often much more discernible than anything on the
spectrum display.

Martin, HS0ZED


On 13/05/2018 07:54, Jim N7US wrote:

> I saw a demo last night of the FlexRadio bandscope.  It showed the noise
> well above, on the Y-axis, the bottom of the display, but the waterfall
> didn't show the noise, just the signals on the band.
>
>  
>
> When I set the REL LVL on my P3 so the noise floor is below the noise, the
> waterfall is blue from the noise, making it difficult to see the signals.
>
>  
>
> Can someone enlighten me as to why the displays are so different?
>
>  
>
> 73, Jim N7US
>
>  
>
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