Bah, my apologies to the list, it works out on the nose, sorry for the wasted bandwidth.
Chuck, K1OM On Sat, Jul 26, 2008 at 8:08 PM, Chuck Grandgent <[EMAIL PROTECTED]> wrote: > never mind, I had 88uH instead of mH. But that still gives 1200Hz, not > 380... > Chuck, K1OM > > > On Sat, Jul 26, 2008 at 7:44 PM, Chuck Grandgent < > [EMAIL PROTECTED]> wrote: > >> 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 >>> >> >> >
