parameters:
author: Ralf DL5EU
catch_exceptions: 'True'
category: '[GRC Hier Blocks]'
cmake_opt: ''
comment: ''
copyright: ''
description: DVB-T reception with low bandwidth on 70cm using an RTL-SDR stick
gen_cmake: 'On'
gen_linking: dynamic
generate_options: qt_gui
hier_block_src_path: '.:'
id: dvbt_rx_rtlsdr
max_nouts: '0'
output_language: python
placement: (0,0)
qt_qss_theme: ''
realtime_scheduling: ''
run: 'True'
run_command: '{python} -u {filename}'
run_options: prompt
sizing_mode: fixed
thread_safe_setters: ''
title: DVB-T RX with low bandwidth on 70cm
window_size: ''
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [72, 36.0]
rotation: 0
state: enabled
blocks:
- name: center_freq
id: variable_qtgui_range
parameters:
comment: ''
gui_hint: 2, 0, 1, 1
label: Center freq.
min_len: '0'
orient: QtCore.Qt.Horizontal
rangeType: int
start: '430000000'
step: '1000'
stop: '440000000'
value: conf_center_freq
widget: counter
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [256, 36.0]
rotation: 0
state: enabled
- name: conf_center_freq
id: variable_config
parameters:
comment: ''
config_file: config.ini
option: center_freq
section: setup
type: int
value: '437000000'
writeback: center_freq
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [512, 588.0]
rotation: 0
state: enabled
- name: conf_freq_corr_ppm
id: variable_config
parameters:
comment: ''
config_file: config.ini
option: freq_corr_ppm
section: setup
type: int
value: '0'
writeback: freq_corr_ppm
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [648, 588.0]
rotation: 0
state: enabled
- name: conf_if_gain_db
id: variable_config
parameters:
comment: ''
config_file: config.ini
option: if_gain_db
section: setup
type: int
value: '10'
writeback: if_gain_db
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [928, 588.0]
rotation: 0
state: enabled
- name: conf_rf_gain_db
id: variable_config
parameters:
comment: ''
config_file: config.ini
option: rf_gain_db
section: setup
type: int
value: '10'
writeback: rf_gain_db
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [792, 588.0]
rotation: 0
state: enabled
- name: conf_samp_rate
id: variable_config
parameters:
comment: ''
config_file: config.ini
option: samp_rate
section: setup
type: real
value: 1000000*8/7
writeback: samp_rate
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [344, 588.0]
rotation: 0
state: enabled
- name: freq_corr_ppm
id: variable_qtgui_range
parameters:
comment: ''
gui_hint: 2, 1, 1, 1
label: Freq. ppm
min_len: '0'
orient: QtCore.Qt.Horizontal
rangeType: int
start: '-100'
step: '1'
stop: '100'
value: conf_freq_corr_ppm
widget: counter
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [392, 36.0]
rotation: 0
state: enabled
- name: if_gain_db
id: variable_qtgui_range
parameters:
comment: ''
gui_hint: 1, 1, 1, 1
label: IF gain
min_len: '0'
orient: QtCore.Qt.Horizontal
rangeType: int
start: '0'
step: '1'
stop: '40'
value: conf_if_gain_db
widget: counter
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [640, 36.0]
rotation: 0
state: enabled
- name: rf_gain_db
id: variable_qtgui_range
parameters:
comment: ''
gui_hint: 1, 0, 1, 1
label: RF gain
min_len: '0'
orient: QtCore.Qt.Horizontal
rangeType: int
start: '0'
step: '1'
stop: '42'
value: conf_rf_gain_db
widget: counter
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [512, 36.0]
rotation: 0
state: enabled
- name: samp_rate
id: variable_qtgui_chooser
parameters:
comment: ''
gui_hint: 7,0,1,1
label: Bandwidth
label0: 200 kHz
label1: 250 kHz
label2: 1 MHz
label3: 2 MHz
label4: ''
labels: '[]'
num_opts: '4'
option0: 200000*8/7
option1: 250000*8/7
option2: 1000000*8/7
option3: 2000000*8/7
option4: '4'
options: '[0, 1, 2]'
orient: Qt.QVBoxLayout
type: real
value: conf_samp_rate
widget: combo_box
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [72, 436.0]
rotation: 0
state: true
- name: blocks_null_sink_0_0
id: blocks_null_sink
parameters:
affinity: ''
alias: ''
bus_structure_sink: '[[0,],]'
comment: ''
num_inputs: '1'
type: complex
vlen: '1705'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1064, 108.0]
rotation: 0
state: enabled
- name: blocks_tag_debug_0
id: blocks_tag_debug
parameters:
affinity: ''
alias: ''
comment: ''
display: 'True'
filter: '"superframe_start"'
name: Superframe before Viterbi Decoder
num_inputs: '1'
type: byte
vlen: '1'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1336, 108.0]
rotation: 0
state: enabled
- name: blocks_tag_debug_0_0
id: blocks_tag_debug
parameters:
affinity: ''
alias: ''
comment: ''
display: 'True'
filter: '"superframe_start"'
name: Superframe after Viterbi Decoder
num_inputs: '1'
type: byte
vlen: '1'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1336, 188.0]
rotation: 0
state: enabled
- name: blocks_vector_to_stream_0
id: blocks_vector_to_stream
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
num_items: '1705'
type: complex
vlen: '1'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1064, 264.0]
rotation: 0
state: enabled
- name: blocks_vector_to_stream_1
id: blocks_vector_to_stream
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
num_items: '1512'
type: byte
vlen: '1'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [368, 352.0]
rotation: 180
state: true
- name: blocks_vector_to_stream_2_0
id: blocks_vector_to_stream
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
num_items: '1512'
type: complex
vlen: '1'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1104, 56.0]
rotation: 180
state: disabled
- name: dl5eu_dvbt_ofdm_synchronization_0
id: dl5eu_dvbt_ofdm_synchronization
parameters:
affinity: ''
alias: ''
comment: ''
guard_interval: GI_1_4
interpolate: 'True'
maxoutbuf: '0'
minoutbuf: '0'
snr: '10'
transmission_mode: T2k
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [392, 192.0]
rotation: 0
state: enabled
- name: dl5eu_dvbt_tps_decoder_0
id: dl5eu_dvbt_tps_decoder
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
print_tps_data: 'True'
show_ports: 'True'
transmission_mode: T2k
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1064, 172.0]
rotation: 0
state: enabled
- name: dl5eu_dvbt_viterbi_decoder_0
id: dl5eu_dvbt_viterbi_decoder
parameters:
affinity: ''
alias: ''
block_size: '768'
code_rate: C3_4
comment: ''
constellation: qpsk
hierarchy: nh
maxoutbuf: '0'
minoutbuf: '0'
type: b
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [264, 516.0]
rotation: 0
state: disabled
- name: dtv_dvbt_bit_inner_deinterleaver_0
id: dtv_dvbt_bit_inner_deinterleaver
parameters:
affinity: ''
alias: ''
comment: ''
constellation: qpsk
hierarchy: nh
maxoutbuf: '0'
minoutbuf: '0'
transmission_mode: T2k
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [560, 340.0]
rotation: 180
state: true
- name: dtv_dvbt_convolutional_deinterleaver_0
id: dtv_dvbt_convolutional_deinterleaver
parameters:
I: '12'
M: '17'
affinity: ''
alias: ''
blocks: '136'
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [624, 460.0]
rotation: 0
state: true
- name: dtv_dvbt_demap_0
id: dtv_dvbt_demap
parameters:
affinity: ''
alias: ''
comment: ''
constellation: qpsk
gain: '1'
hierarchy: nh
maxoutbuf: '0'
minoutbuf: '0'
transmission_mode: T2k
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1064, 324.0]
rotation: 180
state: enabled
- name: dtv_dvbt_energy_descramble_0
id: dtv_dvbt_energy_descramble
parameters:
affinity: ''
alias: ''
comment: ''
maxoutbuf: '0'
minoutbuf: '0'
nsize: '8'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1144, 476.0]
rotation: 0
state: true
- name: dtv_dvbt_reed_solomon_dec_0
id: dtv_dvbt_reed_solomon_dec
parameters:
affinity: ''
alias: ''
blocks: '8'
comment: ''
gfpoly: '0x11d'
k: '239'
m: '8'
maxoutbuf: '0'
minoutbuf: '0'
n: '255'
p: '2'
s: '51'
t: '8'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [888, 420.0]
rotation: 0
state: true
- name: dtv_dvbt_symbol_inner_interleaver_0
id: dtv_dvbt_symbol_inner_interleaver
parameters:
affinity: ''
alias: ''
comment: ''
direction: Deinterleave
maxoutbuf: '0'
minoutbuf: '0'
transmission_mode: T2k
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [800, 340.0]
rotation: 180
state: true
- name: dtv_dvbt_viterbi_decoder_0
id: dtv_dvbt_viterbi_decoder
parameters:
affinity: ''
alias: ''
block_size: '768'
code_rate: C3_4
comment: ''
constellation: qpsk
hierarchy: nh
maxoutbuf: '0'
minoutbuf: '0'
type: b
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [360, 452.0]
rotation: 0
state: enabled
- name: freq_error
id: qtgui_number_sink
parameters:
affinity: ''
alias: ''
autoscale: 'False'
avg: '0'
color1: ("black", "black")
color10: ("black", "black")
color2: ("black", "black")
color3: ("black", "black")
color4: ("black", "black")
color5: ("black", "black")
color6: ("black", "black")
color7: ("black", "black")
color8: ("black", "black")
color9: ("black", "black")
comment: ''
factor1: '1'
factor10: '1'
factor2: '1'
factor3: '1'
factor4: '1'
factor5: '1'
factor6: '1'
factor7: '1'
factor8: '1'
factor9: '1'
graph_type: qtgui.NUM_GRAPH_HORIZ
gui_hint: 5,0,1,2
label1: Freq. error
label10: ''
label2: ''
label3: ''
label4: ''
label5: ''
label6: ''
label7: ''
label8: ''
label9: ''
max: '10'
min: '-10'
name: ''
nconnections: '1'
type: float
unit1: ''
unit10: ''
unit2: ''
unit3: ''
unit4: ''
unit5: ''
unit6: ''
unit7: ''
unit8: ''
unit9: ''
update_time: '0.25'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [800, 132.0]
rotation: 0
state: enabled
- name: network_udp_sink_0
id: network_udp_sink
parameters:
addr: 230.0.0.1
affinity: ''
alias: ''
comment: ''
header: '0'
payloadsize: '1316'
port: '2000'
send_eof: 'True'
type: byte
vlen: '1'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1352, 444.0]
rotation: 0
state: enabled
- name: osmosdr_source_0
id: osmosdr_source
parameters:
affinity: ''
alias: ''
ant0: ''
ant1: ''
ant10: ''
ant11: ''
ant12: ''
ant13: ''
ant14: ''
ant15: ''
ant16: ''
ant17: ''
ant18: ''
ant19: ''
ant2: ''
ant20: ''
ant21: ''
ant22: ''
ant23: ''
ant24: ''
ant25: ''
ant26: ''
ant27: ''
ant28: ''
ant29: ''
ant3: ''
ant30: ''
ant31: ''
ant4: ''
ant5: ''
ant6: ''
ant7: ''
ant8: ''
ant9: ''
args: rtl=0,offset_tune=0,tuner_xtal=28.8e6,rtl_xtal=28.8e6
bb_gain0: '20'
bb_gain1: '20'
bb_gain10: '20'
bb_gain11: '20'
bb_gain12: '20'
bb_gain13: '20'
bb_gain14: '20'
bb_gain15: '20'
bb_gain16: '20'
bb_gain17: '20'
bb_gain18: '20'
bb_gain19: '20'
bb_gain2: '20'
bb_gain20: '20'
bb_gain21: '20'
bb_gain22: '20'
bb_gain23: '20'
bb_gain24: '20'
bb_gain25: '20'
bb_gain26: '20'
bb_gain27: '20'
bb_gain28: '20'
bb_gain29: '20'
bb_gain3: '20'
bb_gain30: '20'
bb_gain31: '20'
bb_gain4: '20'
bb_gain5: '20'
bb_gain6: '20'
bb_gain7: '20'
bb_gain8: '20'
bb_gain9: '20'
bw0: samp_rate
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'
clock_source0: ''
clock_source1: ''
clock_source2: ''
clock_source3: ''
clock_source4: ''
clock_source5: ''
clock_source6: ''
clock_source7: ''
comment: ''
corr0: freq_corr_ppm
corr1: '0'
corr10: '0'
corr11: '0'
corr12: '0'
corr13: '0'
corr14: '0'
corr15: '0'
corr16: '0'
corr17: '0'
corr18: '0'
corr19: '0'
corr2: '0'
corr20: '0'
corr21: '0'
corr22: '0'
corr23: '0'
corr24: '0'
corr25: '0'
corr26: '0'
corr27: '0'
corr28: '0'
corr29: '0'
corr3: '0'
corr30: '0'
corr31: '0'
corr4: '0'
corr5: '0'
corr6: '0'
corr7: '0'
corr8: '0'
corr9: '0'
dc_offset_mode0: '0'
dc_offset_mode1: '0'
dc_offset_mode10: '0'
dc_offset_mode11: '0'
dc_offset_mode12: '0'
dc_offset_mode13: '0'
dc_offset_mode14: '0'
dc_offset_mode15: '0'
dc_offset_mode16: '0'
dc_offset_mode17: '0'
dc_offset_mode18: '0'
dc_offset_mode19: '0'
dc_offset_mode2: '0'
dc_offset_mode20: '0'
dc_offset_mode21: '0'
dc_offset_mode22: '0'
dc_offset_mode23: '0'
dc_offset_mode24: '0'
dc_offset_mode25: '0'
dc_offset_mode26: '0'
dc_offset_mode27: '0'
dc_offset_mode28: '0'
dc_offset_mode29: '0'
dc_offset_mode3: '0'
dc_offset_mode30: '0'
dc_offset_mode31: '0'
dc_offset_mode4: '0'
dc_offset_mode5: '0'
dc_offset_mode6: '0'
dc_offset_mode7: '0'
dc_offset_mode8: '0'
dc_offset_mode9: '0'
freq0: center_freq
freq1: 100e6
freq10: 100e6
freq11: 100e6
freq12: 100e6
freq13: 100e6
freq14: 100e6
freq15: 100e6
freq16: 100e6
freq17: 100e6
freq18: 100e6
freq19: 100e6
freq2: 100e6
freq20: 100e6
freq21: 100e6
freq22: 100e6
freq23: 100e6
freq24: 100e6
freq25: 100e6
freq26: 100e6
freq27: 100e6
freq28: 100e6
freq29: 100e6
freq3: 100e6
freq30: 100e6
freq31: 100e6
freq4: 100e6
freq5: 100e6
freq6: 100e6
freq7: 100e6
freq8: 100e6
freq9: 100e6
gain0: rf_gain_db
gain1: '10'
gain10: '10'
gain11: '10'
gain12: '10'
gain13: '10'
gain14: '10'
gain15: '10'
gain16: '10'
gain17: '10'
gain18: '10'
gain19: '10'
gain2: '10'
gain20: '10'
gain21: '10'
gain22: '10'
gain23: '10'
gain24: '10'
gain25: '10'
gain26: '10'
gain27: '10'
gain28: '10'
gain29: '10'
gain3: '10'
gain30: '10'
gain31: '10'
gain4: '10'
gain5: '10'
gain6: '10'
gain7: '10'
gain8: '10'
gain9: '10'
gain_mode0: 'True'
gain_mode1: 'False'
gain_mode10: 'False'
gain_mode11: 'False'
gain_mode12: 'False'
gain_mode13: 'False'
gain_mode14: 'False'
gain_mode15: 'False'
gain_mode16: 'False'
gain_mode17: 'False'
gain_mode18: 'False'
gain_mode19: 'False'
gain_mode2: 'False'
gain_mode20: 'False'
gain_mode21: 'False'
gain_mode22: 'False'
gain_mode23: 'False'
gain_mode24: 'False'
gain_mode25: 'False'
gain_mode26: 'False'
gain_mode27: 'False'
gain_mode28: 'False'
gain_mode29: 'False'
gain_mode3: 'False'
gain_mode30: 'False'
gain_mode31: 'False'
gain_mode4: 'False'
gain_mode5: 'False'
gain_mode6: 'False'
gain_mode7: 'False'
gain_mode8: 'False'
gain_mode9: 'False'
if_gain0: if_gain_db
if_gain1: '20'
if_gain10: '20'
if_gain11: '20'
if_gain12: '20'
if_gain13: '20'
if_gain14: '20'
if_gain15: '20'
if_gain16: '20'
if_gain17: '20'
if_gain18: '20'
if_gain19: '20'
if_gain2: '20'
if_gain20: '20'
if_gain21: '20'
if_gain22: '20'
if_gain23: '20'
if_gain24: '20'
if_gain25: '20'
if_gain26: '20'
if_gain27: '20'
if_gain28: '20'
if_gain29: '20'
if_gain3: '20'
if_gain30: '20'
if_gain31: '20'
if_gain4: '20'
if_gain5: '20'
if_gain6: '20'
if_gain7: '20'
if_gain8: '20'
if_gain9: '20'
iq_balance_mode0: '0'
iq_balance_mode1: '0'
iq_balance_mode10: '0'
iq_balance_mode11: '0'
iq_balance_mode12: '0'
iq_balance_mode13: '0'
iq_balance_mode14: '0'
iq_balance_mode15: '0'
iq_balance_mode16: '0'
iq_balance_mode17: '0'
iq_balance_mode18: '0'
iq_balance_mode19: '0'
iq_balance_mode2: '0'
iq_balance_mode20: '0'
iq_balance_mode21: '0'
iq_balance_mode22: '0'
iq_balance_mode23: '0'
iq_balance_mode24: '0'
iq_balance_mode25: '0'
iq_balance_mode26: '0'
iq_balance_mode27: '0'
iq_balance_mode28: '0'
iq_balance_mode29: '0'
iq_balance_mode3: '0'
iq_balance_mode30: '0'
iq_balance_mode31: '0'
iq_balance_mode4: '0'
iq_balance_mode5: '0'
iq_balance_mode6: '0'
iq_balance_mode7: '0'
iq_balance_mode8: '0'
iq_balance_mode9: '0'
maxoutbuf: '0'
minoutbuf: '0'
nchan: '1'
num_mboards: '1'
sample_rate: samp_rate
sync: pc_clock
time_source0: external
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: [72, 172.0]
rotation: 0
state: enabled
- name: qtgui_const_sink_x_0
id: qtgui_const_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: '"red"'
color2: '"red"'
color3: '"red"'
color4: '"red"'
color5: '"red"'
color6: '"red"'
color7: '"red"'
color8: '"red"'
color9: '"red"'
comment: ''
grid: 'True'
gui_hint: 0, 0, 1, 2
label1: '" "'
label10: ''
label2: ''
label3: ''
label4: ''
label5: ''
label6: ''
label7: ''
label8: ''
label9: ''
legend: 'True'
marker1: '0'
marker10: '0'
marker2: '0'
marker3: '0'
marker4: '0'
marker5: '0'
marker6: '0'
marker7: '0'
marker8: '0'
marker9: '0'
name: Constellation
nconnections: '1'
size: '1024'
style1: '0'
style10: '0'
style2: '0'
style3: '0'
style4: '0'
style5: '0'
style6: '0'
style7: '0'
style8: '0'
style9: '0'
tr_chan: '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'
xmax: '1.5'
xmin: '-1.5'
ymax: '1.5'
ymin: '-1.5'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [800, 36.0]
rotation: 180
state: disabled
- name: qtgui_const_sink_x_0_0
id: qtgui_const_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: '"red"'
color2: '"red"'
color3: '"red"'
color4: '"red"'
color5: '"red"'
color6: '"red"'
color7: '"red"'
color8: '"red"'
color9: '"red"'
comment: ''
grid: 'True'
gui_hint: 0, 0, 1, 2
label1: '" "'
label10: ''
label2: ''
label3: ''
label4: ''
label5: ''
label6: ''
label7: ''
label8: ''
label9: ''
legend: 'True'
marker1: '0'
marker10: '0'
marker2: '0'
marker3: '0'
marker4: '0'
marker5: '0'
marker6: '0'
marker7: '0'
marker8: '0'
marker9: '0'
name: OFDM signal
nconnections: '1'
size: '1024'
style1: '0'
style10: '0'
style2: '0'
style3: '0'
style4: '0'
style5: '0'
style6: '0'
style7: '0'
style8: '0'
style9: '0'
tr_chan: '0'
tr_level: '0.0'
tr_mode: qtgui.TRIG_MODE_FREE
tr_slope: qtgui.TRIG_SLOPE_POS
tr_tag: '""'
type: complex
update_time: '0.1'
width1: '1'
width10: '1'
width2: '1'
width3: '1'
width4: '1'
width5: '1'
width6: '1'
width7: '1'
width8: '1'
width9: '1'
xmax: '1.5'
xmin: '-1.5'
ymax: '1.5'
ymin: '-1.5'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1336, 244.0]
rotation: 0
state: enabled
- name: samp_error
id: qtgui_number_sink
parameters:
affinity: ''
alias: ''
autoscale: 'False'
avg: '0'
color1: ("black", "black")
color10: ("black", "black")
color2: ("black", "black")
color3: ("black", "black")
color4: ("black", "black")
color5: ("black", "black")
color6: ("black", "black")
color7: ("black", "black")
color8: ("black", "black")
color9: ("black", "black")
comment: ''
factor1: 1e4
factor10: '1'
factor2: '1'
factor3: '1'
factor4: '1'
factor5: '1'
factor6: '1'
factor7: '1'
factor8: '1'
factor9: '1'
graph_type: qtgui.NUM_GRAPH_HORIZ
gui_hint: 6,0,1,2
label1: Samp. error
label10: ''
label2: ''
label3: ''
label4: ''
label5: ''
label6: ''
label7: ''
label8: ''
label9: ''
max: '2'
min: '-2'
name: ''
nconnections: '1'
type: float
unit1: ''
unit10: ''
unit2: ''
unit3: ''
unit4: ''
unit5: ''
unit6: ''
unit7: ''
unit8: ''
unit9: ''
update_time: '0.25'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [800, 236.0]
rotation: 0
state: enabled
connections:
- [blocks_vector_to_stream_0, '0', qtgui_const_sink_x_0_0, '0']
- [blocks_vector_to_stream_1, '0', blocks_tag_debug_0, '0']
- [blocks_vector_to_stream_1, '0', dl5eu_dvbt_viterbi_decoder_0, '0']
- [blocks_vector_to_stream_1, '0', dtv_dvbt_viterbi_decoder_0, '0']
- [blocks_vector_to_stream_2_0, '0', qtgui_const_sink_x_0, '0']
- [dl5eu_dvbt_ofdm_synchronization_0, '0', blocks_vector_to_stream_0, '0']
- [dl5eu_dvbt_ofdm_synchronization_0, '0', dl5eu_dvbt_tps_decoder_0, '0']
- [dl5eu_dvbt_ofdm_synchronization_0, '1', blocks_null_sink_0_0, '0']
- [dl5eu_dvbt_ofdm_synchronization_0, '2', freq_error, '0']
- [dl5eu_dvbt_ofdm_synchronization_0, '3', samp_error, '0']
- [dl5eu_dvbt_tps_decoder_0, '0', blocks_vector_to_stream_2_0, '0']
- [dl5eu_dvbt_tps_decoder_0, '0', dtv_dvbt_demap_0, '0']
- [dl5eu_dvbt_viterbi_decoder_0, '0', blocks_tag_debug_0_0, '0']
- [dl5eu_dvbt_viterbi_decoder_0, '0', dtv_dvbt_convolutional_deinterleaver_0, '0']
- [dtv_dvbt_bit_inner_deinterleaver_0, '0', blocks_vector_to_stream_1, '0']
- [dtv_dvbt_convolutional_deinterleaver_0, '0', dtv_dvbt_reed_solomon_dec_0, '0']
- [dtv_dvbt_demap_0, '0', dtv_dvbt_symbol_inner_interleaver_0, '0']
- [dtv_dvbt_energy_descramble_0, '0', network_udp_sink_0, '0']
- [dtv_dvbt_reed_solomon_dec_0, '0', dtv_dvbt_energy_descramble_0, '0']
- [dtv_dvbt_symbol_inner_interleaver_0, '0', dtv_dvbt_bit_inner_deinterleaver_0, '0']
- [dtv_dvbt_viterbi_decoder_0, '0', blocks_tag_debug_0_0, '0']
- [dtv_dvbt_viterbi_decoder_0, '0', dtv_dvbt_convolutional_deinterleaver_0, '0']
- [osmosdr_source_0, '0', dl5eu_dvbt_ofdm_synchronization_0, '0']
metadata:
file_format: 1
grc_version: 3.10.10.0
Generating: "H:\Projekte\GNURadio\Flowgraphs\dvbt_rx_rtlsdr.py"
Executing: C:\Users\ralf\radioconda\python.exe -u H:\Projekte\GNURadio\Flowgraphs\dvbt_rx_rtlsdr.py
gr-osmosdr 0.2.0.0 (0.2.0) gnuradio 3.10.10.0
built-in source types: file rtl rtl_tcp uhd miri hackrf bladerf airspy airspyhf soapy redpitaya
Using device #0 Realtek RTL2838UHIDIR SN: 00000001
Found Rafael Micro R820T tuner
Setting rtl clock to 28800000 Hz.
Setting tuner clock to 28800000 Hz.
Enabled direct sampling mode, input 2
Exact sample rate is: 1142857.021756 Hz
[R82XX] PLL not locked!
Disabled direct sampling mode
buffer_double_mapped :warning: allocate_buffer: tried to allocate 43 items of size 1512. Due to alignment requirements 8192 were allocated. If this isn't OK, consider padding your structure to a power-of-two bytes. On this platform, our allocation granularity is 65536 bytes.
buffer_double_mapped :warning: allocate_buffer: tried to allocate 43 items of size 1504. Due to alignment requirements 2048 were allocated. If this isn't OK, consider padding your structure to a power-of-two bytes. On this platform, our allocation granularity is 65536 bytes.
buffer_double_mapped :warning: allocate_buffer: tried to allocate 43 items of size 1512. Due to alignment requirements 8192 were allocated. If this isn't OK, consider padding your structure to a power-of-two bytes. On this platform, our allocation granularity is 65536 bytes.
buffer_double_mapped :warning: allocate_buffer: tried to allocate 40 items of size 1632. Due to alignment requirements 2048 were allocated. If this isn't OK, consider padding your structure to a power-of-two bytes. On this platform, our allocation granularity is 65536 bytes.
buffer_double_mapped :warning: allocate_buffer: tried to allocate 43 items of size 1512. Due to alignment requirements 8192 were allocated. If this isn't OK, consider padding your structure to a power-of-two bytes. On this platform, our allocation granularity is 65536 bytes.
buffer_double_mapped :warning: allocate_buffer: tried to allocate 5 items of size 12096. Due to alignment requirements 1024 were allocated. If this isn't OK, consider padding your structure to a power-of-two bytes. On this platform, our allocation granularity is 65536 bytes.
buffer_double_mapped :warning: allocate_buffer: tried to allocate 4 items of size 13640. Due to alignment requirements 8192 were allocated. If this isn't OK, consider padding your structure to a power-of-two bytes. On this platform, our allocation granularity is 65536 bytes.
buffer_double_mapped :warning: allocate_buffer: tried to allocate 4 items of size 13640. Due to alignment requirements 8192 were allocated. If this isn't OK, consider padding your structure to a power-of-two bytes. On this platform, our allocation granularity is 65536 bytes.
TPS decoder: sync_start received from dvbt_ofdm_synchronization
--- TPS Information ---
Carrier Modulation Scheme: QPSK
Hierachy: No Hierarchy
HP Convolutional Code Rate: 3/4
LP Convolutional Code Rate: 3/4
Guard Interval: 1/4
Cell ID: 0
TPS decoder: Superframe start sent at offset 0
----------------------------------------------------------------------
Tag Debug: Superframe before Viterbi Decoder
Input Stream: 00
Offset: 0 Source: dvbt_tps_decoder Key: superframe_start Value: 170
----------------------------------------------------------------------
----------------------------------------------------------------------
Tag Debug: Superframe after Viterbi Decoder
Input Stream: 00
Offset: 0 Source: n/a Key: superframe_start Value: 1
Offset: 0 Source: dvbt_tps_decoder Key: superframe_start Value: 170
----------------------------------------------------------------------
TPS decoder: sync_start received from dvbt_ofdm_synchronization
TPS decoder: resync received from dvbt_ofdm_synchronization
--- TPS Information ---
Carrier Modulation Scheme: QPSK
Hierachy: No Hierarchy
HP Convolutional Code Rate: 3/4
LP Convolutional Code Rate: 3/4
Guard Interval: 1/4
Cell ID: 0
TPS decoder: Superframe start sent at offset 11752565
----------------------------------------------------------------------
Tag Debug: Superframe before Viterbi Decoder
Input Stream: 00
Offset: 10422216 Source: dvbt_tps_decoder Key: superframe_start Value: 170
----------------------------------------------------------------------
----------------------------------------------------------------------
Tag Debug: Superframe after Viterbi Decoder
Input Stream: 00
Offset: 1954070 Source: n/a Key: superframe_start Value: 1
----------------------------------------------------------------------
----------------------------------------------------------------------
Tag Debug: Superframe after Viterbi Decoder
Input Stream: 00
Offset: 10422216 Source: dvbt_tps_decoder Key: superframe_start Value: 170
----------------------------------------------------------------------
Dear all,
this time I have got a question for the stream tag specialists. I have
stumbled over a very annoying problem that seems to be caused by stream
tags that are not processed as expected for whatever reason.
When I start my DVB-T receiver, it sometimes happens that the reception
"hangs" although the signal is correctly decoded. Whenever something
goes wrong (symbol loss, sync loss or whatever) I get a message at the
console, so I don't see a problem in the OFDM symbol recognition and the
TPS decoder and I have also noticed this behaviour with the standard
blocks from gr-dtv. I have attached the flowgraph and the logfile to
this email.
What happens:
line 2: the flowgraph is started
line 34: the TPS decoder has detected the first superframe and signals
this to the blocks downstream.
line 39: superframe_start sent by the TPS decoder is detected before the
Viterbi Decoder at offset 0.
line 45: superframe_start sent by the Viterbi Decoder is detected after
the Viterbi Decoder at offset 0.
line 46: superframe_start sent by the TPS decoder is detected after the
Viterbi Decoder at offset 0.
>>> line 46 seems normal to me because to my knowledge by default
stream tags are propagated.
line 48: the TPS decoder detects a problem and starts to resynchronize
(I have provoked this).
line 59: the TPS decoder has detected a superframe and signals this to
the blocks downstream.
line 64: superframe_start sent by the TPS decoder is detected before the
Viterbi Decoder at offset 10422216.
line 70: superframe_start sent by the Viterbi Decoder is detected after
the Viterbi Decoder at offset 1954070 (strange, where does this
difference come from?).
>>> Reception continues normally. For several seconds nothing special
happens. Then suddenly:
line 76: superframe_start sent by the TPS decoder is detected after the
Viterbi Decoder at offset 10422216. Tis is the propagated tag.
>>> Now reception hangs.
My explanation for this behaviour is that because of the long delay
between the superframe_start generated by the Viterbi Decoder and the
one generated by the TPS decoder (line 76) the superframe_start arrives
at the Convolutional Deinterleaver at a time when there is no start of a
superframe. That causes the Convolutional Deinterleaver to loose
synchronisation and that's why then reception hangs.
When I provoke a resynchronization everything is fine again.
Does anyone have an idea what is going on here?
Thank you very much for your help!
Kind regards,
Ralf
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