Ok, I took the plunge and ordered two PAR filters, the Civil Air ( VHFBP 117-136 ) and the Milair ( UHFBP 225-400) to put inline on two scanners dedicated to those bands. I understood that with band pass filters everything below a certain frequency and above a certain frequency would be cut off, therefore allowing only what is meant to be in that particular band. I haven't tested the UHF Milair one yet but the civil air filter which should cut off everything above 137 mhz or so, is letting in about 3 different channels of the 162 mhz NOAA weather service.
I thought I had the filter installed wrong but I put it inline different ways and still nothing changed. I have a single antenna ( D130J discone ) feeding 4 scanners via a 4 port Stridsberg 204M Active multicoupler.While I do get great signal on all other bands, I see no change at all on the civil airband. I'm kind of confused at this point.
Manny
I thought I had the filter installed wrong but I put it inline different ways and still nothing changed. I have a single antenna ( D130J discone ) feeding 4 scanners via a 4 port Stridsberg 204M Active multicoupler.While I do get great signal on all other bands, I see no change at all on the civil airband. I'm kind of confused at this point.
Manny