[RTTY] K3 FSK TX Bandwidth

[John Merrill]

I Hope this becomes a production release soon or a posted beta release. If
I had 2 K3s I would try it. I really don't want to switch to AFSK to keep
the click cops happy :-).

73, John N1JM


On Sun, Jan 27, 2013 at 11:53 PM, Ed Muns <ed at w0yk.com> wrote:

> Elecraft has already responded to the recent thread about FSK transmit
> bandwidth (K0SM, W7AY, et al).  The K3 DSP firmware engineer coded a
> wave-shaping filter that narrows the transmit bandwidth similar to what
> their AFSK filter provides.  The resulting spectrum image looks like the
> better, i.e., narrowest, of the images in K0SM's recent work.
>
> I updated one of my K3s and ran SO2R on 10 and 15 on Saturday during BARTG
> RTTY Sprint.  I didn't feel empirically that other stations had more
> trouble
> copying me due to the somewhat lower energy in the signal.  If you heard me
> (K6YT)I'm interested in any comments on the two signals if anyone can
> recall.  I intentionally didn't say which band had the new firmware, so you
> aren't biased in your feedback.  ;>)
>
> Elecraft has agreed that I can provide this Beta DSP firmware to anyone who
> would like to evaluate it.  I'll email it upon request.  As expected, you
> use at your own risk since this is not an official release.  Hopefully,
> nothing was broken in the process of making this change, but it hasn't been
> fully regression-tested so user beware.
>
> Ed W0YK
>
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