<-[[.:start]] ====== Svxlink Update (Dual Gateway) ====== --- //John Pumford-Green 02/06/22 19:56// To allow testing and comparison between 2m and 70cm I've got **two** SVXLink gateways running. * MB7AZE : 70cm : 430.050MHz @ 3W using FT-60 * GM4SLV : 2m : 144.625MHz @ ??W using FT-8900 Both feed the same dual band colinear via a duplexer. Both are connected to G4NAB's SVXReflector [[http://svxportal-uk.ddns.net:81/index.php]] (**UPDATE** --- //John Pumford-Green 03/06/22 09:05//) I now realize that the DTMF problems were due to setting ''de-emphasis'' ''ON'' while //actually// using the audio feed from the FT-8900 for ''1200 packet'', which already **has** de-emphasis applied. So I was doing ''double-de-emphasis''. No wonder the tones were being mangled. The deleted section below shows what steps I took to restore the tone detection in this situation, but this isn't //actually// necessary if the __correct__ audio feed is used. The quick-fix is to turn SVXLink's ''de-emphasis'' ''OFF'' and restore the DTMF ''twist'' to its normal value. The better fix will be to re-wire the interface to use the flat 9600 baud audio and restore SVXLink's ''de-emphasis''. Set up audio levels [[public:radio:dormant:mb7azeconf|]] Some tweaks were necessary to get GM4SLV to work - DTMF detection was flaky on certain digits when RX ''de-emphasis'' was enabled - which is necessary when using the ''9600 packet'' flat-audio feed from the FT-8900. The issue seems to be the roll-off of the de-emphasis affecting the DTMF digits that use the widest spaced tone-pairs. There's are configuration items that can fix the problem: ''DTMF_MAX_FWD_TWIST'' and ''DTMF_MAX_REV_TWIST'' in the [Local Receiver] section. I had to set ''DTMF_MAX_FWD_TWIST'' to ''15'' to fix the problem. The ''GM4SLV'' gateway now uses the FT-8900 via an unmodified CM108 sound dongle. The PTT is from GPIO25 and SQL is from CTCSS. I've swapped the Echolink service //from// MB7AZE-L //to// GM4SLV-L. For the next period of testing MB7AZE will be lower profile, and the FT-60 handheld __//can not//__ handle long periods of transmitting (e.g. when set on HUBNET or similar). The start-up script that also sets up GPIO (for PTT): #!/bin/bash CFG=/usr/local/etc/svxlink/svxlink.conf LOG=/home/gm4slv/svxlink.log sudo killall svxlink sudo killall svxlink sudo killall svxlink echo "25" > /sys/class/gpio/export sleep 2 echo "out" > /sys/class/gpio/gpio25/direction sudo svxlink --daemon --logfile=$LOG --config=$CFG exit 0 ''crontab'' to start it at ''reboot'' ''@reboot sleep 30 && sudo -u gm4slv /home/gm4slv/svx_ref.sh >/dev/null 2>&1'' ++++ Here is the current ''svxlink.conf'' for GM4SLV : | [GLOBAL] LOGICS=SimplexLogic,ReflectorLogic CFG_DIR=svxlink.d TIMESTAMP_FORMAT="%c" CARD_SAMPLE_RATE=48000 LOCATION_INFO=LocationInfo LINKS=LinkToReflector [SimplexLogic] TYPE=Simplex RX=Rx1 TX=Tx1 MODULES=ModuleHelp,ModuleParrot,ModuleEchoLink CALLSIGN=GM4SLV SHORT_IDENT_INTERVAL=0 SHORT_CW_ID_ENABLE=0 SHORT_VOICE_ID_ENABLE=0 CW_AMP=-20 CW_PITCH=1000 CW_WPM=20 LONG_IDENT_INTERVAL=0 LONG_VOICE_ID_ENABLE=0 LONG_CW_ID_ENABLE=0 EVENT_HANDLER=/usr/local/share/svxlink/events.tcl DEFAULT_LANG=en_GB RGR_SOUND_DELAY=0 TX_CTCSS=ALWAYS MACROS=Macros FX_GAIN_NORMAL=0 FX_GAIN_LOW=-12 ONLINE_CMD=998877 TIME_FORMAT=24 RGR_SOUND_ALWAYS=1 [RepeaterLogic] [ReflectorLogic] TYPE=Reflector HOSTS=svxportal-uk.ddns.net HOST_PORT=5300 CALLSIGN="change this" AUTH_KEY="change this too" JITTER_BUFFER_DELAY=0 DEFAULT_LANG=en_GB DEFAULT_TG=0 MONITOR_TGS=8,91,235,2350,2351,23561 TG_SELECT_TIMEOUT=60 ANNOUNCE_REMOTE_MIN_INTERVAL=300 MUTE_FIRST_TX_LOC=0 MUTE_FIRST_TX_REM=0 TMP_MONITOR_TIMEOUT=3600 EVENT_HANDLER=/usr/local/share/svxlink/events.tcl NODE_INFO_FILE=/usr/local/etc/svxlink/node_info.json [LinkToReflector] CONNECT_LOGICS=SimplexLogic:9:,ReflectorLogic DEFAULT_ACTIVE=1 OPTIONS=DEFAULT_CONNECT,NO_DISCONNECT [QsoRecorder] REC_DIR=/var/spool/svxlink/qso_recorder MAX_TIME=3600 SOFT_TIME=300 MAX_DIRSIZE=1024 [Voter] [MultiTx] [NetRx] [NetTx] [Rx1] TYPE=Local AUDIO_DEV=alsa:plughw:1,0 AUDIO_CHANNEL=0 SQL_DET=CTCSS SQL_START_DELAY=0 SQL_DELAY=0 SQL_HANGTIME=200 VOX_FILTER_DEPTH=20 VOX_THRESH=1000 CTCSS_FQ=77.0 HID_DEVICE=/dev/hidraw0 HID_SQL_PIN=!VOL_DN SIGLEV_SLOPE=1 SIGLEV_OFFSET=0 SIGLEV_OPEN_THRESH=30 SIGLEV_CLOSE_THRESH=10 DEEMPHASIS=0 PREAMP=0.0 DTMF_DEC_TYPE=INTERNAL DTMF_MUTING=1 DTMF_HANGTIME=40 DTMF_SERIAL=/dev/ttyS0 #DTMF_MAX_FWD_TWIST=8 #DTMF_MAX_REV_TWIST=4 [WbRx1] [Tx1] TYPE=Local AUDIO_DEV=alsa:plughw:1,0 AUDIO_CHANNEL=0 PTT_TYPE=GPIO PTT_PIN=gpio25 HID_DEVICE=/dev/hidraw0 HID_PTT_PIN=GPIO3 PTT_HANGTIME=500 TIMEOUT=300 TX_DELAY=500 CTCSS_FQ=77.0 CTCSS_LEVEL=20 PREEMPHASIS=1 DTMF_TONE_LENGTH=100 DTMF_TONE_SPACING=50 DTMF_DIGIT_PWR=-15 MASTER_GAIN=0 [LocationInfo] APRS_SERVER_LIST=euro.aprs2.net:14580 STATUS_SERVER_LIST=aprs.echolink.org:5199 LON_POSITION=1.25.30W LAT_POSITION=60.17.18N CALLSIGN=EL-GM4SLV FREQUENCY=144.625 TX_POWER=2 ANTENNA_GAIN=3 ANTENNA_HEIGHT=5m ANTENNA_DIR=-1 BEACON_INTERVAL=60 TONE=77 COMMENT=Connected to UK Svx Reflector [Macros] 1=EchoLink:9999# 2=EchoLink:973498# 3=EchoLink:662666# 4=:91235# 5=:9123561# 9=:910# ++++ === overview of config === See [[public:radio:dormant:mb7azeconf|]] ==== Page Info ==== --- //John Pumford-Green 02/06/22 19:56// Page last updated: ~~LASTMOD~~ {{tag>echolink svxlink radio}}