Method DVB.dvb()->tune()
- Method
tune
 inttune(int(2bit)lnb,intfreq,bool|stringpol,intsr)- Description
 Tunes to apropriate transponder's parameters.
- Parameter 
lnb DiSeQc number of LNB.
- Parameter 
freq Frequency divided by 1000.
- Parameter 
pol Polarization.
0or"v"for vertical type,1or"h"for horizontal one.- Parameter 
sr The service rate parameter.