what am I doing wrong ? 1/(2*pi * square root of (LC)) (from memory), with those values I get 12000hz
Chuck, K1OM On Sun, Jul 20, 2008 at 2:25 PM, EP Swynar <[EMAIL PROTECTED]> wrote: > Hi All, > > Saving --- and READING! --- past issues of old radio magazines can be > certainly worth the space and effort... > > To-day, in the October 1970 issue of HAM RADIO (pp. 44 - 46), I stumbled > upon a short piece by W4NVK entitled, "The Simplest Audio Filter". > > And simple it is, indeed...! > > Following the parameters therein for a 380-Hz CW audio frequency, I > connected an 88-mH torroid coil in series with a 2-ufd. capacitor in the > speaker lead of my Drake R-4 receiver...the results are REALLY quite > amazing, and surprisingly effective. > > There are parameters given for CW frequencies of 1200-Hz, down to 380-Hz, > but my ear prefers the lower tones, so I stuck with those particular values. > > If you have a spare 88-mH toroid laying about, along with some extra > capacitors, this is a GREAT, easy-to-add-on adjunct that will only enhance > the CW performance of your vintage commercial rig, or homebrewed > creation...and it's OH SO EASY! > > ~73~ Eddy VE3CUI - VE3XZ >
