[Drake] Keyer

[Dennis Monticelli]

Regarding the raspy sidetone problem that everyone complains about:

I built a simple series resonant circuit consisting of a high inductance
torroid and a mylar capacitor. This combo was wired in series with the
secondary of T2, the output transformer that drives the speaker.  The
components fit under the chassis and work like a champ.  Values of 33mH and
1.33uF (two caps in parallel) gave me the correct resonance with the
generated tone.

Dennis AE6C


On Fri, Feb 5, 2010 at 5:09 PM, Steve Wender <tobiebw2 at newmexico.com> wrote:

> Hi all,
>
> I like  and use the Hallicrafters TO Keyer ever since I became
> addicted  to an electronic keyer and couldn't kick the habit.  That
> was almost 50 years ago.  One problem with the TO Keyer is the awful
> raspy side tone.  I tried various things to make it sound better but
> the only think that worked was an audio filter to remove the higher
> harmonics that made it sound bad.  If anyone has a better idea on how
> to make it sound better, I would like to hear about it.
>
>
>
> Thanks,
>
> Steve
> KC5WN
>
>
> .At 07:34 AM 2/5/2010, Bill Gaines AD8P wrote:
> >Drake at mailman.qth.net
>
> ______________________________________________________________
> Drake mailing list
> Home: http://mailman.qth.net/mailman/listinfo/drake
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Drake at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>