We have a number of Sinclair FP40305BW1HP1 500 watt 3 cavity bandpass
filters for sale. These have been removed from NBPCS base stations and
are in good condition. It appears they consist of 3/4 wave line
sections and probably could be easily retuned down to 900 or up to 1296
MHZ. They have 7/16 DIN connectors that are still bright silver. Size
is about 19X5.25x14 and they weigh about 25 lbs packed and will ship
from central California. We will sell them for $75 each plus shipping
and packing. Photos on this and other 900 MHz items at
www.radioengineering.biz