parameters:
author: ''
category: '[GRC Hier Blocks]'
cmake_opt: ''
comment: ''
copyright: ''
description: ''
gen_cmake: 'On'
gen_linking: dynamic
generate_options: qt_gui
hier_block_src_path: '.:'
id: testN210TX
max_nouts: ''
output_language: python
placement: (0,0)
qt_qss_theme: ''
realtime_scheduling: '1'
run: 'True'
run_command: '{python} -u {filename}'
run_options: prompt
sizing_mode: fixed
thread_safe_setters: ''
title: Test N210 TX
window_size: ''
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [8, 8]
rotation: 0
state: enabled
blocks:
- name: decimation
id: variable
parameters:
comment: ''
value: '20'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [205, 74]
rotation: 0
state: enabled
- name: frequency
id: variable_qtgui_range
parameters:
comment: ''
gui_hint: ''
label: Frequence
min_len: '100'
orient: Qt.Horizontal
rangeType: float
start: 1e6
step: '1'
stop: 30e6
value: 10e6
widget: counter_slider
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [323, 11]
rotation: 0
state: true
- name: samp_rate
id: variable
parameters:
comment: ''
value: 100e6/500
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [206, 9]
rotation: 0
state: enabled
- name: audio_source_0
id: audio_source
parameters:
affinity: ''
alias: ''
comment: ''
device_name: pulse
maxoutbuf: '0'
minoutbuf: '0'
num_outputs: '2'
ok_to_block: 'False'
samp_rate: '48000'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [77, 456]
rotation: 0
state: enabled
- name: blocks_complex_to_real_0
id: blocks_complex_to_real
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
vlen: '1'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [393, 436]
rotation: 0
state: disabled
- name: blocks_null_sink_0
id: blocks_null_sink
parameters:
affinity: ''
alias: ''
bus_structure_sink: '[[0,],]'
comment: ''
num_inputs: '1'
type: float
vlen: '1'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [412, 551]
rotation: 0
state: enabled
- name: fft_filter_xxx_1
id: fft_filter_xxx
parameters:
affinity: ''
alias: ''
comment: ''
decim: '1'
maxoutbuf: '0'
minoutbuf: '8192'
nthreads: '1'
samp_delay: '0'
taps: firdes.low_pass_2(1,48e3,3050,300,30,firdes.WIN_BLACKMAN_HARRIS)
type: ccc
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [600, 357]
rotation: 0
state: enabled
- name: hilbert_fc_0
id: hilbert_fc
parameters:
affinity: ''
alias: ''
beta: '6.76'
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
num_taps: '639'
win: firdes.WIN_BLACKMAN_hARRIS
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [405, 475]
rotation: 0
state: enabled
- name: qtgui_time_sink_x_0
id: qtgui_time_sink_x
parameters:
affinity: ''
alias: ''
alpha1: '1.0'
alpha10: '1.0'
alpha2: '1.0'
alpha3: '1.0'
alpha4: '1.0'
alpha5: '1.0'
alpha6: '1.0'
alpha7: '1.0'
alpha8: '1.0'
alpha9: '1.0'
autoscale: 'False'
axislabels: 'True'
color1: blue
color10: dark blue
color2: red
color3: green
color4: black
color5: cyan
color6: magenta
color7: yellow
color8: dark red
color9: dark green
comment: ''
ctrlpanel: 'False'
entags: 'True'
grid: 'False'
gui_hint: ''
label1: Signal 1
label10: Signal 10
label2: Signal 2
label3: Signal 3
label4: Signal 4
label5: Signal 5
label6: Signal 6
label7: Signal 7
label8: Signal 8
label9: Signal 9
legend: 'True'
marker1: '-1'
marker10: '-1'
marker2: '-1'
marker3: '-1'
marker4: '-1'
marker5: '-1'
marker6: '-1'
marker7: '-1'
marker8: '-1'
marker9: '-1'
name: '""'
nconnections: '1'
size: '1024'
srate: samp_rate
stemplot: 'False'
style1: '1'
style10: '1'
style2: '1'
style3: '1'
style4: '1'
style5: '1'
style6: '1'
style7: '1'
style8: '1'
style9: '1'
tr_chan: '0'
tr_delay: '0'
tr_level: '0.0'
tr_mode: qtgui.TRIG_MODE_FREE
tr_slope: qtgui.TRIG_SLOPE_POS
tr_tag: '""'
type: complex
update_time: '0.10'
width1: '1'
width10: '1'
width2: '1'
width3: '1'
width4: '1'
width5: '1'
width6: '1'
width7: '1'
width8: '1'
width9: '1'
ylabel: Amplitude
ymax: '1'
ymin: '-1'
yunit: '""'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1370, 59]
rotation: 0
state: enabled
- name: qtgui_time_sink_x_0_0
id: qtgui_time_sink_x
parameters:
affinity: ''
alias: ''
alpha1: '1.0'
alpha10: '1.0'
alpha2: '1.0'
alpha3: '1.0'
alpha4: '1.0'
alpha5: '1.0'
alpha6: '1.0'
alpha7: '1.0'
alpha8: '1.0'
alpha9: '1.0'
autoscale: 'False'
axislabels: 'True'
color1: blue
color10: dark blue
color2: red
color3: green
color4: black
color5: cyan
color6: magenta
color7: yellow
color8: dark red
color9: dark green
comment: ''
ctrlpanel: 'False'
entags: 'True'
grid: 'False'
gui_hint: ''
label1: Signal 1
label10: Signal 10
label2: Signal 2
label3: Signal 3
label4: Signal 4
label5: Signal 5
label6: Signal 6
label7: Signal 7
label8: Signal 8
label9: Signal 9
legend: 'True'
marker1: '-1'
marker10: '-1'
marker2: '-1'
marker3: '-1'
marker4: '-1'
marker5: '-1'
marker6: '-1'
marker7: '-1'
marker8: '-1'
marker9: '-1'
name: '""'
nconnections: '1'
size: '1024'
srate: 48e3
stemplot: 'False'
style1: '1'
style10: '1'
style2: '1'
style3: '1'
style4: '1'
style5: '1'
style6: '1'
style7: '1'
style8: '1'
style9: '1'
tr_chan: '0'
tr_delay: '0'
tr_level: '0.0'
tr_mode: qtgui.TRIG_MODE_FREE
tr_slope: qtgui.TRIG_SLOPE_POS
tr_tag: '""'
type: float
update_time: '0.10'
width1: '1'
width10: '1'
width2: '1'
width3: '1'
width4: '1'
width5: '1'
width6: '1'
width7: '1'
width8: '1'
width9: '1'
ylabel: Amplitude
ymax: '1'
ymin: '-1'
yunit: '""'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [733, 102]
rotation: 0
state: enabled
- name: rational_resampler_xxx_0
id: rational_resampler_xxx
parameters:
affinity: ''
alias: ''
comment: ''
decim: '6'
fbw: '0.4'
interp: '25'
maxoutbuf: '0'
minoutbuf: '0'
taps: ''
type: ccc
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [856, 297]
rotation: 0
state: true
- name: uhd_usrp_sink_0
id: uhd_usrp_sink
parameters:
affinity: ''
alias: ''
ant0: TX/RX
ant1: TX/RX
ant10: TX/RX
ant11: TX/RX
ant12: TX/RX
ant13: TX/RX
ant14: TX/RX
ant15: TX/RX
ant16: TX/RX
ant17: TX/RX
ant18: TX/RX
ant19: TX/RX
ant2: TX/RX
ant20: TX/RX
ant21: TX/RX
ant22: TX/RX
ant23: TX/RX
ant24: TX/RX
ant25: TX/RX
ant26: TX/RX
ant27: TX/RX
ant28: TX/RX
ant29: TX/RX
ant3: TX/RX
ant30: TX/RX
ant31: TX/RX
ant4: TX/RX
ant5: TX/RX
ant6: TX/RX
ant7: TX/RX
ant8: TX/RX
ant9: TX/RX
bw0: '0'
bw1: '0'
bw10: '0'
bw11: '0'
bw12: '0'
bw13: '0'
bw14: '0'
bw15: '0'
bw16: '0'
bw17: '0'
bw18: '0'
bw19: '0'
bw2: '0'
bw20: '0'
bw21: '0'
bw22: '0'
bw23: '0'
bw24: '0'
bw25: '0'
bw26: '0'
bw27: '0'
bw28: '0'
bw29: '0'
bw3: '0'
bw30: '0'
bw31: '0'
bw4: '0'
bw5: '0'
bw6: '0'
bw7: '0'
bw8: '0'
bw9: '0'
center_freq0: frequency
center_freq1: '0'
center_freq10: '0'
center_freq11: '0'
center_freq12: '0'
center_freq13: '0'
center_freq14: '0'
center_freq15: '0'
center_freq16: '0'
center_freq17: '0'
center_freq18: '0'
center_freq19: '0'
center_freq2: '0'
center_freq20: '0'
center_freq21: '0'
center_freq22: '0'
center_freq23: '0'
center_freq24: '0'
center_freq25: '0'
center_freq26: '0'
center_freq27: '0'
center_freq28: '0'
center_freq29: '0'
center_freq3: '0'
center_freq30: '0'
center_freq31: '0'
center_freq4: '0'
center_freq5: '0'
center_freq6: '0'
center_freq7: '0'
center_freq8: '0'
center_freq9: '0'
clock_rate: 0e0
clock_source0: internal
clock_source1: ''
clock_source2: ''
clock_source3: ''
clock_source4: ''
clock_source5: ''
clock_source6: ''
clock_source7: ''
comment: ''
dev_addr: addr=192.168.10.2
dev_args: type=usrp2
gain0: '0'
gain1: '0'
gain10: '0'
gain11: '0'
gain12: '0'
gain13: '0'
gain14: '0'
gain15: '0'
gain16: '0'
gain17: '0'
gain18: '0'
gain19: '0'
gain2: '0'
gain20: '0'
gain21: '0'
gain22: '0'
gain23: '0'
gain24: '0'
gain25: '0'
gain26: '0'
gain27: '0'
gain28: '0'
gain29: '0'
gain3: '0'
gain30: '0'
gain31: '0'
gain4: '0'
gain5: '0'
gain6: '0'
gain7: '0'
gain8: '0'
gain9: '0'
len_tag_name: ''
lo_export0: 'False'
lo_export1: 'False'
lo_export10: 'False'
lo_export11: 'False'
lo_export12: 'False'
lo_export13: 'False'
lo_export14: 'False'
lo_export15: 'False'
lo_export16: 'False'
lo_export17: 'False'
lo_export18: 'False'
lo_export19: 'False'
lo_export2: 'False'
lo_export20: 'False'
lo_export21: 'False'
lo_export22: 'False'
lo_export23: 'False'
lo_export24: 'False'
lo_export25: 'False'
lo_export26: 'False'
lo_export27: 'False'
lo_export28: 'False'
lo_export29: 'False'
lo_export3: 'False'
lo_export30: 'False'
lo_export31: 'False'
lo_export4: 'False'
lo_export5: 'False'
lo_export6: 'False'
lo_export7: 'False'
lo_export8: 'False'
lo_export9: 'False'
lo_source0: internal
lo_source1: internal
lo_source10: internal
lo_source11: internal
lo_source12: internal
lo_source13: internal
lo_source14: internal
lo_source15: internal
lo_source16: internal
lo_source17: internal
lo_source18: internal
lo_source19: internal
lo_source2: internal
lo_source20: internal
lo_source21: internal
lo_source22: internal
lo_source23: internal
lo_source24: internal
lo_source25: internal
lo_source26: internal
lo_source27: internal
lo_source28: internal
lo_source29: internal
lo_source3: internal
lo_source30: internal
lo_source31: internal
lo_source4: internal
lo_source5: internal
lo_source6: internal
lo_source7: internal
lo_source8: internal
lo_source9: internal
maxoutbuf: ''
minoutbuf: ''
nchan: '1'
norm_gain0: 'False'
norm_gain1: 'False'
norm_gain10: 'False'
norm_gain11: 'False'
norm_gain12: 'False'
norm_gain13: 'False'
norm_gain14: 'False'
norm_gain15: 'False'
norm_gain16: 'False'
norm_gain17: 'False'
norm_gain18: 'False'
norm_gain19: 'False'
norm_gain2: 'False'
norm_gain20: 'False'
norm_gain21: 'False'
norm_gain22: 'False'
norm_gain23: 'False'
norm_gain24: 'False'
norm_gain25: 'False'
norm_gain26: 'False'
norm_gain27: 'False'
norm_gain28: 'False'
norm_gain29: 'False'
norm_gain3: 'False'
norm_gain30: 'False'
norm_gain31: 'False'
norm_gain4: 'False'
norm_gain5: 'False'
norm_gain6: 'False'
norm_gain7: 'False'
norm_gain8: 'False'
norm_gain9: 'False'
num_mboards: '1'
otw: sc16
samp_rate: samp_rate
sd_spec0: '"A:A"'
sd_spec1: ''
sd_spec2: ''
sd_spec3: ''
sd_spec4: ''
sd_spec5: ''
sd_spec6: ''
sd_spec7: ''
show_lo_controls: 'False'
stream_args: ''
stream_chans: '[]'
sync: none
time_source0: ''
time_source1: ''
time_source2: ''
time_source3: ''
time_source4: ''
time_source5: ''
time_source6: ''
time_source7: ''
type: fc32
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1267, 388]
rotation: 0
state: enabled
- name: uhd_usrp_source_0
id: uhd_usrp_source
parameters:
affinity: ''
alias: ''
ant0: TX/RX
ant1: RX2
ant10: RX2
ant11: RX2
ant12: RX2
ant13: RX2
ant14: RX2
ant15: RX2
ant16: RX2
ant17: RX2
ant18: RX2
ant19: RX2
ant2: RX2
ant20: RX2
ant21: RX2
ant22: RX2
ant23: RX2
ant24: RX2
ant25: RX2
ant26: RX2
ant27: RX2
ant28: RX2
ant29: RX2
ant3: RX2
ant30: RX2
ant31: RX2
ant4: RX2
ant5: RX2
ant6: RX2
ant7: RX2
ant8: RX2
ant9: RX2
bw0: '0'
bw1: '0'
bw10: '0'
bw11: '0'
bw12: '0'
bw13: '0'
bw14: '0'
bw15: '0'
bw16: '0'
bw17: '0'
bw18: '0'
bw19: '0'
bw2: '0'
bw20: '0'
bw21: '0'
bw22: '0'
bw23: '0'
bw24: '0'
bw25: '0'
bw26: '0'
bw27: '0'
bw28: '0'
bw29: '0'
bw3: '0'
bw30: '0'
bw31: '0'
bw4: '0'
bw5: '0'
bw6: '0'
bw7: '0'
bw8: '0'
bw9: '0'
center_freq0: '0'
center_freq1: '0'
center_freq10: '0'
center_freq11: '0'
center_freq12: '0'
center_freq13: '0'
center_freq14: '0'
center_freq15: '0'
center_freq16: '0'
center_freq17: '0'
center_freq18: '0'
center_freq19: '0'
center_freq2: '0'
center_freq20: '0'
center_freq21: '0'
center_freq22: '0'
center_freq23: '0'
center_freq24: '0'
center_freq25: '0'
center_freq26: '0'
center_freq27: '0'
center_freq28: '0'
center_freq29: '0'
center_freq3: '0'
center_freq30: '0'
center_freq31: '0'
center_freq4: '0'
center_freq5: '0'
center_freq6: '0'
center_freq7: '0'
center_freq8: '0'
center_freq9: '0'
clock_rate: 0e0
clock_source0: ''
clock_source1: ''
clock_source2: ''
clock_source3: ''
clock_source4: ''
clock_source5: ''
clock_source6: ''
clock_source7: ''
comment: ''
dc_offs_enb0: '""'
dc_offs_enb1: '""'
dc_offs_enb10: '""'
dc_offs_enb11: '""'
dc_offs_enb12: '""'
dc_offs_enb13: '""'
dc_offs_enb14: '""'
dc_offs_enb15: '""'
dc_offs_enb16: '""'
dc_offs_enb17: '""'
dc_offs_enb18: '""'
dc_offs_enb19: '""'
dc_offs_enb2: '""'
dc_offs_enb20: '""'
dc_offs_enb21: '""'
dc_offs_enb22: '""'
dc_offs_enb23: '""'
dc_offs_enb24: '""'
dc_offs_enb25: '""'
dc_offs_enb26: '""'
dc_offs_enb27: '""'
dc_offs_enb28: '""'
dc_offs_enb29: '""'
dc_offs_enb3: '""'
dc_offs_enb30: '""'
dc_offs_enb31: '""'
dc_offs_enb4: '""'
dc_offs_enb5: '""'
dc_offs_enb6: '""'
dc_offs_enb7: '""'
dc_offs_enb8: '""'
dc_offs_enb9: '""'
dev_addr: '"addr=192.168.10.2"'
dev_args: '"type=usrp2"'
gain0: '0'
gain1: '0'
gain10: '0'
gain11: '0'
gain12: '0'
gain13: '0'
gain14: '0'
gain15: '0'
gain16: '0'
gain17: '0'
gain18: '0'
gain19: '0'
gain2: '0'
gain20: '0'
gain21: '0'
gain22: '0'
gain23: '0'
gain24: '0'
gain25: '0'
gain26: '0'
gain27: '0'
gain28: '0'
gain29: '0'
gain3: '0'
gain30: '0'
gain31: '0'
gain4: '0'
gain5: '0'
gain6: '0'
gain7: '0'
gain8: '0'
gain9: '0'
iq_imbal_enb0: '""'
iq_imbal_enb1: '""'
iq_imbal_enb10: '""'
iq_imbal_enb11: '""'
iq_imbal_enb12: '""'
iq_imbal_enb13: '""'
iq_imbal_enb14: '""'
iq_imbal_enb15: '""'
iq_imbal_enb16: '""'
iq_imbal_enb17: '""'
iq_imbal_enb18: '""'
iq_imbal_enb19: '""'
iq_imbal_enb2: '""'
iq_imbal_enb20: '""'
iq_imbal_enb21: '""'
iq_imbal_enb22: '""'
iq_imbal_enb23: '""'
iq_imbal_enb24: '""'
iq_imbal_enb25: '""'
iq_imbal_enb26: '""'
iq_imbal_enb27: '""'
iq_imbal_enb28: '""'
iq_imbal_enb29: '""'
iq_imbal_enb3: '""'
iq_imbal_enb30: '""'
iq_imbal_enb31: '""'
iq_imbal_enb4: '""'
iq_imbal_enb5: '""'
iq_imbal_enb6: '""'
iq_imbal_enb7: '""'
iq_imbal_enb8: '""'
iq_imbal_enb9: '""'
lo_export0: 'False'
lo_export1: 'False'
lo_export10: 'False'
lo_export11: 'False'
lo_export12: 'False'
lo_export13: 'False'
lo_export14: 'False'
lo_export15: 'False'
lo_export16: 'False'
lo_export17: 'False'
lo_export18: 'False'
lo_export19: 'False'
lo_export2: 'False'
lo_export20: 'False'
lo_export21: 'False'
lo_export22: 'False'
lo_export23: 'False'
lo_export24: 'False'
lo_export25: 'False'
lo_export26: 'False'
lo_export27: 'False'
lo_export28: 'False'
lo_export29: 'False'
lo_export3: 'False'
lo_export30: 'False'
lo_export31: 'False'
lo_export4: 'False'
lo_export5: 'False'
lo_export6: 'False'
lo_export7: 'False'
lo_export8: 'False'
lo_export9: 'False'
lo_source0: internal
lo_source1: internal
lo_source10: internal
lo_source11: internal
lo_source12: internal
lo_source13: internal
lo_source14: internal
lo_source15: internal
lo_source16: internal
lo_source17: internal
lo_source18: internal
lo_source19: internal
lo_source2: internal
lo_source20: internal
lo_source21: internal
lo_source22: internal
lo_source23: internal
lo_source24: internal
lo_source25: internal
lo_source26: internal
lo_source27: internal
lo_source28: internal
lo_source29: internal
lo_source3: internal
lo_source30: internal
lo_source31: internal
lo_source4: internal
lo_source5: internal
lo_source6: internal
lo_source7: internal
lo_source8: internal
lo_source9: internal
maxoutbuf: ''
minoutbuf: ''
nchan: '1'
norm_gain0: 'False'
norm_gain1: 'False'
norm_gain10: 'False'
norm_gain11: 'False'
norm_gain12: 'False'
norm_gain13: 'False'
norm_gain14: 'False'
norm_gain15: 'False'
norm_gain16: 'False'
norm_gain17: 'False'
norm_gain18: 'False'
norm_gain19: 'False'
norm_gain2: 'False'
norm_gain20: 'False'
norm_gain21: 'False'
norm_gain22: 'False'
norm_gain23: 'False'
norm_gain24: 'False'
norm_gain25: 'False'
norm_gain26: 'False'
norm_gain27: 'False'
norm_gain28: 'False'
norm_gain29: 'False'
norm_gain3: 'False'
norm_gain30: 'False'
norm_gain31: 'False'
norm_gain4: 'False'
norm_gain5: 'False'
norm_gain6: 'False'
norm_gain7: 'False'
norm_gain8: 'False'
norm_gain9: 'False'
num_mboards: '1'
otw: sc16
rx_agc0: Default
rx_agc1: Default
rx_agc10: Default
rx_agc11: Default
rx_agc12: Default
rx_agc13: Default
rx_agc14: Default
rx_agc15: Default
rx_agc16: Default
rx_agc17: Default
rx_agc18: Default
rx_agc19: Default
rx_agc2: Default
rx_agc20: Default
rx_agc21: Default
rx_agc22: Default
rx_agc23: Default
rx_agc24: Default
rx_agc25: Default
rx_agc26: Default
rx_agc27: Default
rx_agc28: Default
rx_agc29: Default
rx_agc3: Default
rx_agc30: Default
rx_agc31: Default
rx_agc4: Default
rx_agc5: Default
rx_agc6: Default
rx_agc7: Default
rx_agc8: Default
rx_agc9: Default
samp_rate: samp_rate
sd_spec0: '"A:A"'
sd_spec1: ''
sd_spec2: ''
sd_spec3: ''
sd_spec4: ''
sd_spec5: ''
sd_spec6: ''
sd_spec7: ''
show_lo_controls: 'False'
stream_args: ''
stream_chans: '[]'
sync: none
time_source0: ''
time_source1: ''
time_source2: ''
time_source3: ''
time_source4: ''
time_source5: ''
time_source6: ''
time_source7: ''
type: fc32
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [85, 204]
rotation: 0
state: disabled
connections:
- [audio_source_0, '0', hilbert_fc_0, '0']
- [audio_source_0, '0', qtgui_time_sink_x_0_0, '0']
- [audio_source_0, '1', blocks_null_sink_0, '0']
- [blocks_complex_to_real_0, '0', hilbert_fc_0, '0']
- [fft_filter_xxx_1, '0', rational_resampler_xxx_0, '0']
- [hilbert_fc_0, '0', fft_filter_xxx_1, '0']
- [rational_resampler_xxx_0, '0', qtgui_time_sink_x_0, '0']
- [rational_resampler_xxx_0, '0', uhd_usrp_sink_0, '0']
- [uhd_usrp_source_0, '0', blocks_complex_to_real_0, '0']
- [uhd_usrp_source_0, '0', qtgui_time_sink_x_0_0, '0']
metadata:
file_format: 1
Hello,
I'm trying to make work the attached flowgraph : a simple Audio source,
some filtering and feeding an USRP sink (N210).
I have two problems with it :
- I measure the latency between audio input and RF output of the N210
and it is too long for me as I have about 30-40ms at the minimum.
- I have some underruns <U> at the startup of the flowgraph and then
sometimes others <U> appear. The problem is that at each new <U>, the
latency is increasing.
I do not use that over hours but the latency seems to be out of control.
I'm working on a laptop DELL Precision M4800 with a I7-4800M, 8Go RAM
and a NVidia Quadro K2100M.
GNURadio 3.8.2 is installed from source on Lubuntu 20.04 with UHD4.0.
UHD and GNURadio are installed from source.
I try a lot of things without any beginning of a small optimization or
correction of the problem :
- Working on a Lubuntu with a LXQT and lowlatency kernel,
- Try to play with the MTU and send/recv buffers,
- Install Cuda and OpenCL to play with GR-CLENABLED and GR-LFAST for the
filters,
- Reduce the taps of my FFT bandpass filter,
- Test UHD bandwidth using benchmark provided : with 25Msps in TX and
25Msps in RX at the same time, no underrun.
- Decimate the signal from the Audio Source around 10Ksps to get small
number of taps for the FFT bandpass filter.
The only way to remove the underrun are :
- Feed the USRP sink with an little higher sampling than it expects (but
signal at the TX output is wrong, I know).
- Remove completly the FFT bandpass filter and the Hilbert.
My flowgraph seems so simple that I hope I only miss a stupid thing. I
hope someone here could help me find where is my mistake and how I can,
at the minimum, warranty that my latency are stable even if it is at
40-50ms.
Thanks for your help,
Best regards,
Fabien, F4CTZ.
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