[Elecraft] [Elecraft_K3] A Different View--K3 Reduced-bandwidthRTTY Analysis

[Jim Brown]

On 3/25/2013 2:34 PM, Dave Hachadorian wrote:
>> Many of us have wondered why our watt meters diddled like the RTTY 
>> tones.
>
>> Hopefully that is fixed too.
>
> That is not fixed. 

it is my understanding that with AFSK, at least, the cause is a bit of 
ripple in the 2.7 kHz filter. I have 2.8 kHz filters in the TX position 
of my K3s, and I see less of that than I did with 2.7 kHz filters. Wayne 
can address how that might relate to his implementation of FSK.

There's no good reason for using FSK as opposed to AFSK with a K3 or KX3 
-- several months ago, I did extensive testing with W6GJB of FSK and 
AFSK (using MMTTY) and AFSK was significantly narrower than FSK.  That 
was with standard firmware, not the new Beta. The 2Tone author says his 
AFSK is even cleaner. We haven't looked at that yet.

73, Jim K9YC