[klotz@localhost pskmeter]$ ./pskmeter /dev/ttyUSB0 
Using device /dev/ttyUSB0
Sending v
SKMETER Firmware Version 1.10.

(c) 2003 KF6VSG www.ssiserver.com/info/pskmeter

rmsvalue 12
Min 0 at 13; looking for second min at .+32=45
found 1 at .+32
min_pos = 13, second_min_pos = 45, half_wave_length = 32
IMD = -29.318921 RMS_ERROR = 0.006544 under
rmsvalue 12
Min 1 at 23; looking for second min at .+32=55
found 1 at .+31
min_pos = 23, second_min_pos = 54, half_wave_length = 31
IMD = -27.895093 RMS_ERROR = 0.009658 under
rmsvalue 17
CARRIER: min 69 max 71 rms 17