On 3/17/19 12:55 PM, Marcus D. Leech wrote:
On 03/17/2019 11:09 AM, John Ackermann N8UR wrote:
I'm working on a flowgraph that generates an output waveform about 375
kHz wide with very high peak-to-average power -- at least 20 dB. This
is sent into a USRP1 with BasicTX board to generate an output at 29
MHz. I'd like to show in the flowgraph GUI the peak instantaneous
output level, to help in setting the gain.
[ ... ]
ANother approach is to simply multiply your signal by, let's say, 0.5
before being presented to the radio. Crank that value up until you get
distortion, then back off by sqrt(2).
That's what I'm currently doing -- actually, I do a constant mult of
from 100 to 500 on the source signal (a file of 16 bit IQ recorded from
an HF SDR). What I'm trying to do is set up a way to monitor for
clipping without needing a separate spectrum analyzer, as each recording
has different characteristics and a different optimum gain.
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