[HBR] El-Cheapo (and El-SIMPLO!) CW Filter

[EP Swynar]

Hi John,

I still had one in ye "...olden golden junque boxxe" here from years
before...

I believe there are still independent "jobbers" on-line who have these
available --- that, or simply appeal to the group on one of the
Reflectors...I'm sure someone would probably gladly mail you one, just out
of your interest alone, rather than having it sitting around doing nothing
but collecting dust!

How about, guys...? Any takers (or rather, "GIVERS"!) out there who might be
of assistance to  John along this line...?

~73~ Eddy VE3CUI - VE3XZ

PS: I just attached a second 2-ufd. capacitor in parallel with the first --- 
the CW audio peak is even lower now, and better than before (for MY ears,
anyway).


*******************************************




----- Original Message ----- 
From: "john" <johnmb at nc.rr.com>
To: "HBR Receiver List" <hbr at mailman.qth.net>
Sent: Sunday, July 20, 2008 3:06 PM
Subject: Re: [HBR] El-Cheapo (and El-SIMPLO!) CW Filter


> Eddy....where do you find the toroids!?
>
> John K5MO
>
>
> At 02:25 PM 7/20/2008, you 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
> >************************************
> >Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> >construction notes...... via http://www.qsl.net/k5bcq/
> >there is also a mirror (faster response)at http://k5bcq.edebris.com/
> >
> >
> >Retrieve reflector archived data via
> >http://mailman.qth.net/mailman/listinfo/hbr
>
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
> there is also a mirror (faster response)at http://k5bcq.edebris.com/
>
>
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr