if you are having a power issue you could try this power supply
Blonder Tongue Power Supply (LPI 188PS) | LPI 188PS [Blonder Tongue] | Blonder Tongue Power Supply (LPI 188PS)
i was looking for a standalone power inserter from a dpp44 for a while but had no luck.
i ran across this for $19...its specs are 18v 800ma. i picked one up and works great for me.