PSN-L Email List Message

Subject: Re: WinSDR question
From: Larry Cochrane lcochrane@..............
Date: Tue, 18 Aug 2009 19:41:40 -0700


> Hi All,
> I have been trying to provide calibration data for our 24-hour displays, by 
> going to Settings > Channel Control > DC Offset, putting in a number, then 
> watching how far the trace moves up/down.  Knowing the instrument 
> sensitivity per count, I can translate that into velocity units per 
> line.  I had been assuming that the number I was entering for the DC Offset 
> is always representing counts, but now I am not so sure.
> Does anyone know how that works?

Looking at the code the offset is applied to the A/D count and then divided by a
number to get the trace to show up in the right Y location depending on the Y Scale.
Here's the code:

yLoc = lineOffset + -( ( adcData + dcOffset ) / divScale );

> BTW I am getting frequent short data dropouts in the output display.  I 
> have tracked that down to the possibility that I don't have enough RAM 
> (512MB) and am planning to add some more to see if that makes things better.

Adding more memory may help, but you might be trying to displaying too many data
points. As WinSDR draws the screen it is not reading the TCP/IP packets for the
network stack so you will loose data if it takes to long to draw the screen.

Larry Cochrane
Redwood City, PSN


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