I have a slimline dish (formerly) with 5 LNBs running through a SWM8. I changed the LNB to a SWM3 and removed the SWM8. I have probably a 150 foot run of cable. The SWM3 LNB did not power up via the PI-21. I installed the PI-28 that was used to operate the SWM8 and the system powered up and is running great. My question: Am I going to do long term harm running the PI-28 or is the voltage loss over the long run of cable compensating for the "incorrect" power inserter?