I bought a DLW Associates FL1718 filter and have been completely happy with that choice. I got mine direct from Doug Williams because I wanted a custom filter with one of the notches centered right on the broadcaster's frequency. Specs say >90dB attenuation at that notch frequency. I was willing to accept a slightly less steep rejection skirt in order to get that optimized notch.
http://www.dlwc.com/ I just ran a daytime check with my filter in and out of the line. My local BCB flamethrower indicates 50dB over S9 on my FT-1000D. Inserting the filter drops the S-meter reading to S2. Assuming 5dB per S unit, this is -85dB indicated- and this is without any special measures such as a better (low inductance) station ground or any inline chokes. Such measures should improve the ultimate rejection a little more. The broadcaster drops power considerably at night, and is then only faintly audible in my receiver with no S-meter deflection at all. The right location for such a high pass filter is between your Rx/Tx and any power amplifier- unless the transceiver happens to have unusually high transmitter power exceeding 200W. If I had to make this buying decision again I would buy this model again without hesitation. It's an amazingly effective filter, good for up to 200W on transmit. I wish the local broadcaster had paid for my filter, too- HI! 73, David K3KY _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
