Using the SB-301 on CW

[Michael Waldrop]

I had the same problem with my SB-300. The problem is caused
by the CW filter, not the BFO. Changing the BFO frequency will
not cure the problem.

The high pitched note when using the CW filter is because of
the CW filter. To change the note to a lower frequency requires
installing a different CW filter.

There are CW filters available but the cost is not worth it. What
I did was build an outboard audio CW filter with an adjustable
bandpass between 400Hz to 1Khz. The one I built runs on a 9 volt
battery and the bandpass frequency is adjustable by an internal
pot. There are no modifications required to the SB-300/301 to
use the filter.

If you are interested in this outboard CW filter, drop me an email.
I am good on qrz.com. I seldom use the CW filter anymore. The outboard
CW audio filter works fine for me.

73's
Mike
W5RKL




On Thu, 1 Feb 2007 09:23:37 -0800, Allen Jones <w9dz at YAHOO.COM> wrote:

>The 1000 Hz note you get when you center a CW station
>using the Heath CW filter is much too high in
>frequency for me.  I prefer something lower, 700-750
>Hz which seems to be the norm for most of the stuff
>built today.  Anyone aware of a mod to change the peak
>frequency?  I assume it would require shifting the
>BFO.
>
>Thanks
>
>Allen, W9DZ
>
>
>
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