Actually re-reading the original post. Do you have a PVR-150 MCE with the remote kit OR is this a PVR-150 non mce with the Happauge remote?
If it is the 150 MCE then there are plenty of posts in the forum regarding the SMK transceiver but if I recall you need to recompile the MCEusb_2 as LMCE ships with Lirc 0.8.2 but with Driver 1.29 and you need driver 1.30. You can also just recompile Lirc with the 1.30 driver added. But if you search the forums you will find some hints.
You can search for MCE not transmitting or the like and you will find it.