GNU Radio (Companion) bug

options:
parameters:
author: Laurent F4FDW
category: '[GRC Hier Blocks]'
cmake_opt: ''
comment: ''
copyright: ''
description: Flow Graph de reception DVB-T 1 MHz de BW sur 70cm avec un stick
RTL-SDR
gen_cmake: 'On'
gen_linking: dynamic
generate_options: qt_gui
hier_block_src_path: '.:'
id: dvbt_rx_udp
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: RX DVB-T en low BW sur 70cm
window_size: ''
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [16, 16.0]
rotation: 0
state: enabled

blocks:
- name: center_freq
id: variable
parameters:
comment: ''
value: ui_center_freq
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [328, 564.0]
rotation: 0
state: enabled
- name: freq_corr_ppm
id: variable
parameters:
comment: ''
value: ui_freq_corr_ppm
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [208, 564.0]
rotation: 0
state: enabled
- name: if_gain_db
id: variable
parameters:
comment: ''
value: ui_if_gain_db
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [528, 564.0]
rotation: 0
state: enabled
- name: rf_gain_db
id: variable
parameters:
comment: ''
value: ui_rf_gain_db
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [432, 564.0]
rotation: 0
state: enabled
- name: samp_rate
id: variable
parameters:
comment: ''
value: (250000 * 8) / 7
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [856, 564.0]
rotation: 0
state: disabled
- name: samp_rate_chooser_0
id: variable_qtgui_chooser
parameters:
comment: ''
gui_hint: 4,0,1,1
label: Bandwidth
label0: 200khz
label1: 250khz
label2: 1Mhz
label3: 2MHz
label4: ''
labels: '[]'
num_opts: '4'
option0: '228571'
option1: '285714'
option2: '1142857'
option3: '2285714'
option4: ''
options: '[0, 1, 2]'
orient: Qt.QHBoxLayout
type: real
value: '1142857'
widget: radio_buttons
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [16, 408.0]
rotation: 0
state: true
- name: ui_center_freq
id: variable_qtgui_range
parameters:
comment: ''
gui_hint: 2, 0,1,1
label: center freq.
min_len: '0'
orient: Qt.Horizontal
rangeType: int
start: '430000000'
step: '1000'
stop: '440000000'
value: '434000000'
widget: counter
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [352, 20.0]
rotation: 0
state: enabled
- name: ui_freq_corr_ppm
id: variable_qtgui_range
parameters:
comment: ''
gui_hint: 2, 1,1,1
label: Freq. ppm
min_len: '0'
orient: Qt.Horizontal
rangeType: int
start: '-100'
step: '1'
stop: '100'
value: '11'
widget: counter
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [216, 20.0]
rotation: 0
state: enabled
- name: ui_if_gain_db
id: variable_qtgui_range
parameters:
comment: ''
gui_hint: 1, 1,1,1
label: IF gain
min_len: '0'
orient: Qt.Horizontal
rangeType: int
start: '0'
step: '1'
stop: '40'
value: '12'
widget: counter
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [632, 20.0]
rotation: 0
state: enabled
- name: ui_rf_gain_db
id: variable_qtgui_range
parameters:
comment: ''
gui_hint: 1, 0,1,1
label: RF gain
min_len: '0'
orient: Qt.Horizontal
rangeType: float
start: '0'
step: '1'
stop: '42'
value: '18'
widget: counter
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [496, 20.0]
rotation: 0
state: enabled
- name: blocks_udp_sink_0
id: blocks_udp_sink
parameters:
affinity: ''
alias: ''
comment: ''
eof: 'True'
ipaddr: 230.0.0.10
port: '10000'
psize: '1316'
type: byte
vlen: '1'
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1168, 468.0]
rotation: 0
state: true
- name: blocks_vector_to_stream_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: [1192, 56.0]
rotation: 180
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: [552, 376.0]
rotation: 180
state: true
- 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: [720, 364.0]
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: [280, 476.0]
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: [1168, 348.0]
rotation: 180
state: true
- name: dtv_dvbt_demod_reference_signals_0
id: dtv_dvbt_demod_reference_signals
parameters:
affinity: ''
alias: ''
cell_id: '0'
code_rate_hp: C3_4
code_rate_lp: C3_4
comment: ''
constellation: qpsk
guard_interval: GI_1_8
hierarchy: nh
include_cell_id: call_id_yes
maxoutbuf: '0'
minoutbuf: '0'
transmission_mode: T2k
type: complex
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [1144, 124.0]
rotation: 0
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: [912, 492.0]
rotation: 0
state: true
- name: dtv_dvbt_ofdm_sym_acquisition_0
id: dtv_dvbt_ofdm_sym_acquisition
parameters:
affinity: ''
alias: ''
comment: ''
cp_length: '256'
fft_length: '2048'
maxoutbuf: '0'
minoutbuf: '0'
occupied_tones: '1705'
snr: '10'
type: complex
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [504, 268.0]
rotation: 0
state: disabled
- 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: [656, 436.0]
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: [936, 364.0]
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: [288, 348.0]
rotation: 180
state: true
- name: dvbtx_ofdm_sym_acquisition_0
id: dvbtx_ofdm_sym_acquisition
parameters:
affinity: ''
alias: ''
comment: ''
cp_length: '256'
fft_length: '2048'
maxoutbuf: '0'
minoutbuf: '0'
occupied_tones: '1705'
snr: '10'
type: complex
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [576, 156.0]
rotation: 0
state: enabled
- name: fft_vxx_0
id: fft_vxx
parameters:
affinity: ''
alias: ''
comment: ''
fft_size: '2048'
forward: 'True'
maxoutbuf: '0'
minoutbuf: '0'
nthreads: '1'
shift: 'True'
type: complex
window: window.rectangular(2048)
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [912, 156.0]
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: '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'
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: 'False'
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_chooser_0
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: [16, 152.0]
rotation: 0
state: true
- 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: [784, 36.0]
rotation: 180
state: enabled
- name: qtgui_waterfall_sink_x_0
id: qtgui_waterfall_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'
axislabels: 'False'
bw: samp_rate_chooser_0 *2
color1: '0'
color10: '0'
color2: '0'
color3: '0'
color4: '0'
color5: '0'
color6: '0'
color7: '0'
color8: '0'
color9: '0'
comment: ''
fc: '0'
fftsize: '1024'
freqhalf: 'True'
grid: 'True'
gui_hint: 3,0,1,2
int_max: '10'
int_min: '-140'
label1: ''
label10: ''
label2: ''
label3: ''
label4: ''
label5: ''
label6: ''
label7: ''
label8: ''
label9: ''
legend: 'True'
maxoutbuf: '0'
minoutbuf: '0'
name: Calibrage
nconnections: '1'
showports: 'True'
type: complex
update_time: '0.01'
wintype: window.WIN_BLACKMAN_hARRIS
states:
bus_sink: false
bus_source: false
bus_structure: null
coordinate: [336, 156.0]
rotation: 0
state: enabled

connections:
- [blocks_vector_to_stream_0, '0', qtgui_const_sink_x_0, '0']
- [blocks_vector_to_stream_1, '0', dtv_dvbt_viterbi_decoder_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_demod_reference_signals_0, '0', blocks_vector_to_stream_0, '0']
- [dtv_dvbt_demod_reference_signals_0, '0', dtv_dvbt_demap_0, '0']
- [dtv_dvbt_energy_descramble_0, '0', blocks_udp_sink_0, '0']
- [dtv_dvbt_ofdm_sym_acquisition_0, '0', fft_vxx_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', dtv_dvbt_convolutional_deinterleaver_0, '0']
- [dvbtx_ofdm_sym_acquisition_0, '0', fft_vxx_0, '0']
- [fft_vxx_0, '0', dtv_dvbt_demod_reference_signals_0, '0']
- [osmosdr_source_0, '0', dtv_dvbt_ofdm_sym_acquisition_0, '0']
- [osmosdr_source_0, '0', dvbtx_ofdm_sym_acquisition_0, '0']
- [osmosdr_source_0, '0', qtgui_waterfall_sink_x_0, '0']

metadata:
file_format: 1
Dear all,

I have spent several hours before my PC trying to get my new OOT block
running, but in vain. Now I have got the impression that one of my
problems is due to a bug in GNU Radio (Companion). I have attached a
working graph (using Qt GUI) to this email. I am not used to report bugs
but in the wiki I have read that I should send an email to this list.

The problem is, that in certain cases when I change the value of a
parameter in a combo box, GRC displays a message telling me that ports
are disconnected although they are not.

This behaviour can easily reproduced. In GRC, load the attached flow
graph and open the properties window of a block that has a combo box.
Then, change a parameter and click the "Apply" button. The value in the
block changes. Then change the value back. As soon as you select the
item in the combo box, a message is displayed telling you that the ports
are not connected and no more changes are accepted, even when you click
on "Apply".

I have verified this with GNU Radio version 3.8.2.0 on Linux (Python
3.8.5) and 3.8.0.0 on Windows (Python 2.7.10). GNU Radio 3.9 (checked on
Windows) does not show this behaviour but if I remember correctly, not
everything has been ported to version 3.9 yet and for this reason I
would like to keep version 3.8. Would it be possible to fix this bug
also in version 3.8?

Thank you very much for your help.

Kind regards,

Ralf