Since obtaining an 8 pole 250 Hz filter to compliment my 8 pole 400 Hz filter, I have been puzzled as to why the 400 Hz filter appeared to have more loss than the 250 Hz one (it should be the other way around). Talking with another K3 owner brought the possibility that the 400 Hz filter might need an offset, so I fed my signal generator into the K3 and checked. Adjusting the offset brought up the signal by 1 S-Unit to match the reading from the 250 Hz filter, I set the offset in the middle of the two points where the meter dropped. The optimum setting for my filter is -0.07.
I think this has been discussed here before (possibly by Tom, N0SS) but I couldn't find it during a search. My 400 Hz filter was supplied with my K3 in Nov 2007, the 250 Hz filter was new this year. 73 Dave, G4AON K3/100 #80 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
