Hi Chuck,
Take it up with W4NVK --- I was quoting the results he attained from the
article that HE wrote, NOT yours truly! Hi Hi.
~73~ Eddy VE3CUI - VE3XZ
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----- Original Message -----
From: Chuck Grandgent
To: drakelist@zerobeat.net
Sent: Saturday, July 26, 2008 7:44 PM
Subject: Re: [drakelist] El-Cheapo (and El-SIMPLO!) CW Filter
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
