diff --git a/recipes-bsp/ntp/files/sysmocom-odu/ntp.conf b/recipes-bsp/ntp/files/sysmocom-odu/ntp.conf
index 4b75931..8bcfb7d 100644
--- a/recipes-bsp/ntp/files/sysmocom-odu/ntp.conf
+++ b/recipes-bsp/ntp/files/sysmocom-odu/ntp.conf
@@ -3,6 +3,10 @@
 # machine - it records the machine specific clock error
 driftfile /etc/ntp.drift
 
+# allow a larger distance between serial and PPS
+# mindist is in seconds
+tos mindist 0.250
+
 # This obtains a random server which will be close
 # (in IP terms) to the machine.  Add other servers
 # as required, or change this.
@@ -14,11 +18,11 @@ server 127.127.1.0
 fudge 127.127.1.0 stratum 14
 
 # GPSD interface for NMEA based time
-server 127.127.28.0
-fudge 127.127.28.0 refid GPS
+server 127.127.46.0 minpoll 4 prefer
+fudge 127.127.46.0 refid GPS stratum 1 time2 0.720
 
 # PPS interface to kernel
-server 127.127.22.0
+server 127.127.22.0 minpoll 4
 fudge 127.127.22.0 refid PPS
 
 # Defining a default security setting, allowing queries but declining