I have an Inrad 705C filter with original box for sale. This is the most often recommended filter for the FT-1000MP sub-receiver. It is 500Hz (455kHz) - $80 which includes shipping. Mike, W4UM (ex-K4KUZ) w4um at arrl.net South Florida DX Association http://www.qsl.net/k4fk/ Florida Contest Group http://www.floridacontestgroup.org