When I executed the sync_to_gps, it always outputs "ref locked".However, if I 
executed usrp_list_sensors and test_clock_synch, the reference lock status is 
quite unstable.I guess I found the reason why it is unstable.this is because 
the "unstable" applications check the "ref_locked" sensors only one 
time.However, in sync_to_gps, there is a loop to check the sensor "ref_locked" 
many times.So, the one who wants to check the reference lock status precisely 
should check the sensor more than 3~4 times. Not only one time.Hojoon
-----------------------원본메일-----------------------보낸사람 : "Marcus D. Leech via 
USRP-users" <usrp-users@lists.ettus.com>받는사람: usrp-users@lists.ettus.com보낸날짜: 
2018-04-25 22:02:35 GMT +0900 (ROK)제목: Re: [USRP-users] Octoclock reference 
unlock
 
 
  On 04/24/2018 11:24 PM, Hojoon Yang via USRP-users wrote: 
   > 
   > Thank you for reply, Marcus. 
   > 
   > I replaced the USRP B200 with internal GPSDO to USRP B210 without 
   > internal GPSDO. 
   > 
   > However, I got same result. 
   > 
   > when I typed "sudo ./usrp_list_sensors", sometimes Ref: locked, 
   > sometimes Ref: unlocked.. 
   > 
   > I waited about 10 minute, before I executed the application. I thought 
   > It needs time to be locked. 
   > 
   > Following are the outputs. 
   > 
   > 
   Could you try a different 10MHz port on your Octoclock? Could you try a 
   different cable? 
   
   
   
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