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[Discuss-gnuradio] Re: unknown peak in the FFT-Plot Sink
From: |
feldmaus |
Subject: |
[Discuss-gnuradio] Re: unknown peak in the FFT-Plot Sink |
Date: |
Sat, 21 Mar 2009 13:36:56 +0000 (UTC) |
User-agent: |
Loom/3.14 (http://gmane.org/) |
Paul Mathews <opto <at> whidbey.com> writes:
>
> Use an Intermediate Frequency (IF) and frequency translating filter.
> Paul Mathews
I still use the IF by tune my usrp source with,
usrp.tune(self.usrp_source, 0, self.selected_device, self.usrp_freq)
But i think you mean to tune the "frequency translating filter" ?!
Therefor i want to know what is <tabs> ?
I read <channel filter>. Is this equivalent to <bandpass filter>
or do you mean the IO-Ports from the DA-converters ?
Sorry but i didn't learned the english translated technical term.
How to fit up this <frequency translation filter> ?
# USRP SOURCE
self.usrp_simple_source_x = grc_usrp.simple_source_c(which=0, side='B',
rx_ant='RXB')
self.usrp_simple_source_x.set_decim_rate(decim)
self.usrp_simple_source_x.set_frequency(freq, verbose=True)
self.usrp_simple_source_x.set_gain(gain_usrp_source)
# FREQU. TRANS. FILTER
self.gr_freq_xlating_fir_filter_xxx_0 = gr.freq_xlating_fir_filter_ccc(decim,
(1, ), freq, samp_rate)
# FFT PLOT SINK
self.wxgui_fftsink2 = fftsink2.fft_sink_c(
self.GetWin(),
baseband_freq=0,
y_per_div=10,
y_divs=8,
ref_level=80,
sample_rate=samp_rate,
fft_size=512*2,
fft_rate=20,
average=True,
avg_alpha=None,
title="FFT Plot",
peak_hold=False,
)
When i start this, it seems to be busy !
When i tune the freq with my slider, all 3 elemts will be tuned.
Is this correct?
Or should i set up the baseband frequency of the fft plot to 0Hz ?
Any Hints ?
Regards Marksu