bash : oconv: command not found

Hi,

I have installed cygwin on Windows 7. and Radiance 3R9 as per instruction.

I made just a room.rad file (as per tutorial) to check my installation.
file is inside home\brajesh\ directory

executing the command
oconv room.rad > test.oct

i get the following message
bash: oconv: command not find.

How do i fix it

Best Regards,
Brajesh Lal