As per the recent thread; I have a 9 MHz 1.8 kHz model 218 filter which I'm not going to use and I would find use with a 9MHz 250Hz filter model 219. Easiest would be if someone has the model 219 and wants to trade for my 218. 2nd best would be if someone has a 219 and wants to sell it outright. Off list please, Gary ka1j