[Yaesu] conversion scale from dbu to microvolts

Sat Jul 29 09:05:40 EDT 2006

 I just received the service manual for my Yaesu FT-1500M and would 
like to calibrate the S-Meter but unfortunately Yaesu uses dbu's which 
is all dutch to me as all of my test gear use either microvolts or dbm.
 It would be nice to find a conversion scale for this but Google did 
not bring up a chart for me. For now, I need the conversion into either 
microvolts or dbm of:
1) -7dbu
2) -13 dbu
3) + 20 dbu
 Thanks from Fern