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Re: [Discuss-gnuradio] 'Counts' in WX Scope Plot

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] 'Counts' in WX Scope Plot
Date: Thu, 10 Jul 2014 09:26:01 -0400

On Thu, Jul 10, 2014 at 5:23 AM, Martin Braun <address@hidden> wrote:
On 07/10/2014 05:33 AM, Vanush Vaswani wrote:
> I think 'Magnitude' is better than counts, which is just confusing.

There's a difference: 'Counts' implies the digital nature of the signal,
and 'Magnitude' cannot be negative. 'Amplitude' would work, but again,
that doesn't imply amplitude-discrete steps.


I generally agree with Martin, though I'm also generally not pedantic about this sort of thing. One issue to point out here, though, is that you /can/ change this. If you open up the options of the scope sink, the last parameter is "Y Axis Label" and you can set it to whatever unit you like. "Monkeys", for example.


> On Wed, Jul 9, 2014 at 7:19 PM, Sylvain Munaut <address@hidden> wrote:
>> On Wed, Jul 9, 2014 at 11:09 AM, jsam45 <address@hidden> wrote:
>>> The vertical axis in Scope Plot is labelled as Counts. What does it mean? How
>>> is it related to the physical parameters of the signal like amplitude/power?
>> It's dependent on your hardware.
>> Basically 'count' is just the raw value and what that value means is
>> whatever the source block returned. It can be normalized between -1.0
>> and 1.0 or represent the raw adc value, and then what voltage the
>> represents depends on the ADC reference used in your hw. What power it
>> represent at the input depends on the total gain in the rx chain from
>> input to ADC ...
>> All of that is out-of-scope for GR, you have to calibrate it out if
>> you want absolute/known units.
>> Cheers,
>>    Sylvain

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