Theoretical DDS offsets (N x 10.000000 MHz / 2^32):
137777 Hz: +0.200 mHz
137500 Hz: -0.745 mHz = 137499.999255 (~0.8 mHz low)

IW4DXW  137485.0006 Hz
pilot   137499.9992 Hz
DXW-pilot  -14.9986 Hz

(DXW-pilot)+(pilot-fc)=(DXW-fc)

file  pilot-fc  DXW-fc  #glitches
hhmm     Hz    offs Hz
0008   .1012            9   (pilot level?)
0108   .10              0   (pilot only first 25%)
0208   .0959            1 ? (pilot only last 20%)
0308   .0947  -14.9039  0
0408   .0934  -14.9052  0
0508   .0925  -14.9061  0 
0608   .0917  -14.9069  2 
0708   .0912  -14.9074  1


16-12-20: "CQ DXW K" 8ch 2s 8k19a

time offset:
file: hh:50:36.9
dxw:  hh:00:00.0
start:    9:23.1 = 563.1 s