Svx Mobile

Plan…

To make a mobile hotspot that will provide access to SVXReflector and Echolink as well as a handy single-frequency parrot repeater.

Hardware

Remains the same as the previous portable hotspot

Raspberry Pi
CM108 soundcard
IC-2E
MiFi router

It will be installed in my vehicle, which also has a TM-D710 for APRS and voice comms.

Add 5V regulator to power R.Pi from 12VDC
Put everything in a grab-box for portability

SVXLink Config

Echolink Module enabled (switchable via DTMF commands)
Echolink using a Java JRE and Echolink Proxy running on my VPS machine to enable incoming connections.

Logic.tcl additions for switching EL on/off

Added to <…>/events.d/local/Logic.tcl

 # Example: Custom command executed when DTMF 97 is received
  if {$cmd == "97"} {
    puts "Executing external command"
    playMsg "Core" "online"
    exec /home/gm4slv/svx_ref_el.sh &
    return 1
  }

  # Example: Custom command executed when DTMF 98 is received
  if {$cmd == "98"} {
    puts "Executing external command"
    playMsg "Core" "online"
    exec /home/gm4slv/svx_ref_noel.sh &
    return 1
  }
  # Example: Custom command executed when DTMF 99 is received
  if {$cmd == "99"} {
    puts "Executing external command"
    playMsg "Core" "online"
    exec /home/gm4slv/svx_noref_el.sh &
    return 1
  }

DTMF command 97# will cause svxlink to restart with Reflector connected, Echolink connected.
DTMF command 98# will cause svxlink to restart with Reflector connected, Echolink disabled.
DTMF command 99# will cause svxlink to restart with Reflector disabled, Echolink connected.

Start with Reflector ON and Echolink ON

97#

#!/bin/bash
 
CFG=/usr/local/etc/svxlink/svxlink_ref_el.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

Start with Reflector ON, Echolink Disabled

98#

#!/bin/bash
 
CFG=/usr/local/etc/svxlink/svxlink_ref_noel.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

Start with Reflector disabled, Echolink ON

99#

#!/bin/bash
 
CFG=/usr/local/etc/svxlink/svxlink_noref_el.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

It's probable that I'll configure the initial start @reboot to be with Reflector and Echolink

crontab → @reboot sleep 30 && sudo -u gm4slv /home/gm4slv/svx_ref_el.sh >/dev/null 2>&1

Using a PROXY server for connecting to Echolink, and be able to accept incoming Echolink connections, is necessary because it's not possible to control external firewall/port forwarding when using the MiFi 4G router for internet access.

Connecting direct to Echolink, without the proxy still allows outgoing Echolink connections to be made

Rather than relying on other PUBLIC Echolink proxies I though it would be wise to install and run a proxy server myself, on the VPS machine. It turned out to be easier than I thought and the basic steps are here

Parrot

I imagine being able to use the Parrot feature as a temporary single-frequency repeater perhaps for emergency use?

I'll experiment….

Page Info

— John Pumford-Green 03/06/22 17:59

Page last updated: 09/03/25 16:33 GMT

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