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sm0svx / svxlink

Advanced repeater system software with EchoLink support for Linux including a GUI, Qtel - the Qt EchoLink client
http://svxlink.org/
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USB SDR gives terrible audio #495

Open KayosPi opened 4 years ago

KayosPi commented 4 years ago

I have a working Svxlink setup, version 17.12.2-4 running on a Raspberry Pi4

I've tried to add an SDR to improve receive range and no matter how I config I get terrible interference on the audio. SDR is working as expected, rtl_sdr, blacklist and udev configured. If I use devcal I can hear nice clear audio (either transmitting or if I use a broadcast FM frequency)

I get the same plugged into the pi or through an Orange Pi Zero as a remote link

CTCSS and DTMF decoding work perfectly on the SDR input

Config file below, using the audio in and out works as expected

` [GLOBAL] MODULE_PATH=/usr/lib/arm-linux-gnueabihf/svxlink LOGICS=SimplexLogic CFG_DIR=/etc/svxlink/svxlink.d TIMESTAMP_FORMAT="%c" CARD_SAMPLE_RATE=48000 CARD_CHANNELS=1

LOCATION_INFO=LocationInfo

LINKS=LinkToR4

[SimplexLogic] TYPE=Simplex RX=Voter TX=Local_Tx MODULES=ModuleHelp,ModuleParrot CALLSIGN=26AB1234 SHORT_IDENT_INTERVAL=10 LONG_IDENT_INTERVAL=60

IDENT_ONLY_AFTER_TX=4

EXEC_CMD_ON_SQL_CLOSE=500

EVENT_HANDLER=/usr/share/svxlink/events.tcl DEFAULT_LANG=en_US RGR_SOUND_DELAY=0

REPORT_CTCSS=136.5

TX_CTCSS=ALWAYS

MACROS=Macros FX_GAIN_NORMAL=0 FX_GAIN_LOW=-12

ACTIVATE_MODULE_ON_LONG_CMD=4:EchoLink

QSO_RECORDER=8:QsoRecorder

ONLINE_CMD=998877

MUTE_RX_ON_TX=1 MUTE_TX_ON_RX=1

STATE_PTY=/var/run/svxlink/state

DTMF_CTRL_PTY=/dev/shm/simplex_dtmf_ctrl

[RepeaterLogic] TYPE=Repeater RX=Sdr1 TX=Local_Tx MODULES=ModuleHelp,ModuleParrot CALLSIGN=26AB1234 SHORT_IDENT_INTERVAL=10 LONG_IDENT_INTERVAL=60

IDENT_ONLY_AFTER_TX=4

EXEC_CMD_ON_SQL_CLOSE=500

EVENT_HANDLER=/usr/share/svxlink/events.tcl DEFAULT_LANG=en_US RGR_SOUND_DELAY=-1 REPORT_CTCSS=186.2

TX_CTCSS=SQL_OPEN

MACROS=Macros

SEL5_MACRO_RANGE=03400,03499

FX_GAIN_NORMAL=0 FX_GAIN_LOW=-12

QSO_RECORDER=8:QsoRecorder

NO_REPEAT=1

IDLE_TIMEOUT=2

OPEN_ON_1750=1000

OPEN_ON_CTCSS=186:500

OPEN_ON_DTMF=5

OPEN_ON_SQL=50

OPEN_ON_SEL5=01234

OPEN_SQL_FLANK=OPEN

OPEN_ON_SQL_AFTER_RPT_CLOSE=10

IDLE_SOUND_INTERVAL=3000

SQL_FLAP_SUP_MIN_TIME=500

SQL_FLAP_SUP_MAX_COUNT=6

ACTIVATE_MODULE_ON_LONG_CMD=4:EchoLink

IDENT_NAG_TIMEOUT=15

IDENT_NAG_MIN_TIME=2000

ONLINE_CMD=998877

STATE_PTY=/var/run/svxlink/state

DTMF_CTRL_PTY=/dev/shm/repeater_dtmf_ctrl

[MultiTx] TYPE=Multi TRANSMITTERS=Remote_Tx1,Local_Tx

[Voter] TYPE=Voter RECEIVERS=Sdr1,Local_Rx VOTING_DELAY=200 BUFFER_LENGTH=0

REVOTE_INTERVAL=1000

HYSTERESIS=50

SQL_CLOSE_REVOTE_DELAY=500

RX_SWITCH_DELAY=500

COMMAND_PTY=/dev/shm/voter_ctrl

[Sdr1] TYPE=Ddr

FQ=89300000

FQ=446193750

FQ=164050000 MODULATION=NBFM SQL_DET=CTCSS

VOX_FILTER_DEPTH=20

VOX_THRESH=500

CTCSS_MODE=2 CTCSS_FQ=71

CTCSS_SNR_OFFSET=0

CTCSS_OPEN_THRESH=15

CTCSS_CLOSE_THRESH=9

CTCSS_BPF_LOW=60

CTCSS_BPF_HIGH=270

SIGLEV_DET=DDR

SIGLEV_SLOPE=1.54

SIGLEV_OFFSET=98.10

SIGLEV_BOGUS_THRESH=120

TONE_SIGLEV_MAP=100,84,60,50,37,32,28,23,19,8

SIGLEV_OPEN_THRESH=30 SIGLEV_CLOSE_THRESH=10 SQL_START_DELAY=0 SQL_DELAY=0 SQL_HANGTIME=200

SQL_EXTENDED_HANGTIME=1000

SQL_EXTENDED_HANGTIME_THRESH=15

SQL_TIMEOUT=600

DEEMPHASIS=0

SQL_TAIL_ELIM=300

PREAMP=-4 PEAK_METER=0 DTMF_DEC_TYPE=INTERNAL DTMF_MUTING=0 DTMF_HANGTIME=40 DTMF_SERIAL=/dev/ttyS0

DTMF_PTY=/tmp/rx1_dtmf

DTMF_MAX_FWD_TWIST=8

DTMF_MAX_REV_TWIST=4

1750_MUTING=1

WBRX=WbRx1

[WbRx1] TYPE=RtlUsb

DEV_MATCH=0

HOST=localhost

PORT=1234

CENTER_FQ=44614375

FQ_CORR=1 GAIN=8.7 SAMPLE_RATE=960000

SAMPLE_RATE=2400000

[Local_Rx] TYPE=Local AUDIO_DEV=alsa:plughw:1 AUDIO_CHANNEL=0 SQL_DET=VOX SQL_START_DELAY=0 SQL_DELAY=0 SQL_HANGTIME=400 SQL_EXTENDED_HANGTIME=1000 SQL_EXTENDED_HANGTIME_THRESH=15

SQL_TIMEOUT=600

VOX_FILTER_DEPTH=20 VOX_THRESH=500

CTCSS_MODE=2

CTCSS_FQ=71.9

CTCSS_SNR_OFFSET=0

CTCSS_OPEN_THRESH=-5

CTCSS_CLOSE_THRESH=9

CTCSS_BPF_LOW=80

CTCSS_BPF_HIGH=180

SERIAL_PORT=/dev/ttyS0

SERIAL_PIN=CTS

SERIAL_SET_PINS=DTR!RTS

EVDEV_DEVNAME=/dev/input/by-id/usb-SYNIC_SYNIC_Wireless_Audio-event-if03

EVDEV_OPEN=1,163,1

EVDEV_CLOSE=1,163,0

GPIO_PATH=/sys/class/gpio

GPIO_SQL_PIN=gpio30

PTY_PATH=/tmp/rx1_sql

HID_DEVICE=/dev/hidraw3

HID_SQL_PIN=VOL_UP

SIGLEV_DET=TONE

SIGLEV_SLOPE=1 SIGLEV_OFFSET=0

SIGLEV_BOGUS_THRESH=120

TONE_SIGLEV_MAP=100,84,60,50,37,32,28,23,19,8

SIGLEV_OPEN_THRESH=30 SIGLEV_CLOSE_THRESH=10 DEEMPHASIS=1

SQL_TAIL_ELIM=300

PREAMP=6

PEAK_METER=0 DTMF_DEC_TYPE=INTERNAL DTMF_MUTING=1 DTMF_HANGTIME=40 DTMF_SERIAL=/dev/ttyS0

DTMF_PTY=/tmp/rx1_dtmf

DTMF_MAX_FWD_TWIST=8

DTMF_MAX_REV_TWIST=4

1750_MUTING=1

[Local_Tx] TYPE=Local AUDIO_DEV=alsa:plughw:1 AUDIO_CHANNEL=0 PTT_TYPE=NONE PTT_PORT=/dev/ttyAMA1 PTT_PIN=RTS

HID_DEVICE=/dev/hidraw3

HID_PTT_PIN=GPIO3

SERIAL_SET_PINS=DTR!RTS

GPIO_PATH=/sys/class/gpio

PTT_HANGTIME=1000

TIMEOUT=300 TX_DELAY=0

CTCSS_FQ=136.5

CTCSS_LEVEL=9

PREEMPHASIS=0 DTMF_TONE_LENGTH=100 DTMF_TONE_SPACING=50 DTMF_DIGIT_PWR=-15

MASTER_GAIN=0.0

`

dj1an commented 4 years ago

FQ_CORR=1

Are you sure, this is correct? Depending on the used SDR Stick, this could be much higher. The cheap ones need about 40-70 ppm correction. It may be the case, that you are receiving off Frequency. Try to evaluate this parameter with a known signal and any SDR Program like GQRX/SDR#/... after letting the SDR warm up in RX Mode for about 30 Minutes.

73 de DJ1AN, Jan

KayosPi commented 4 years ago

100% correct, good quality SDR's checked against other equipment. No issues with GQRX, SDR# tested on the laptop as well. Was my first thought when devcal told me the deviation was 0 to 1

I haven't solved it but i have a workaround, rtl_tcp instead of directly reading works fine, i'd rather not use that as the plan eventually is to completely strip out the O/S to a bare minimum. The sound quality and frequency when it does work is superb, even on 6.25khz bandwidth