|
From: | John Ackermann N8UR |
Subject: | [Discuss-gnuradio] Capturing maximum complex value |
Date: | Sun, 17 Mar 2019 11:09:07 -0400 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 |
It's painfully clear on a spectrum analyzer when the gain is too high. The attached shows (a) single CW carrier at max output (orange); (b) output without clipping (yellow); and (c) output with occasional clipping (blue). These are max-hold plots so the clipping is caught even though it happens only very infrequently.
Is there a probe or other function that can capture and hold the maximum instantaneous value of a complex stream? If not, is there a way to create that capability out of other blocks?
And, am I barking up the wrong tree -- is the distortion likely caused by the complex output being driven into digital clipping when enough vectors add up, or is this a function of the analog conversion in the USRP? i.e., is the problem likely to be on the input or output side of the DAC?
Thanks, John
PEAK_AVG.png
Description: PNG image
[Prev in Thread] | Current Thread | [Next in Thread] |