Clark & Roger, The pre-production CW roofing filter from INRAD (and presumably the standard one they are offering) has an offset of 700 Hz, not 750 Hz, so the mismatch is not quite as bad. Probably t
Thanks, Chuck. I knew someone would have a better analogy of explaining this situation than I did at 4:30AM after being up nearly 22 hours and spending the past 10 hours working the 160 Meter CW cont
Roger and Chuck - Thanks for the explanations, it is good to see the basics of the argument for a different center frequency. I believe I was the first guy to have the 221 (after bugging Ten Tec alon
FWIW, I measured the spectrum and the passband of my Inrad 600hz 4-pole roofing filter in the Orion measures 650hz at the -6dB points and about 900hz at the -20dB points, and agrees well with Inrad's