[Elecraft] Obscure RTTY bug?

[Iain MacDonnell - N6ML]

Kok Chen wrote:
> The odd thing is that the glitches in Iain's recording appear to occur a 
> cycle or two before a frequency shift.  It almost appears to be due to 
> an improperly windowed FIR filter, but it could be caused by anything 
> else...

It does seem like something like that, but what I can't get past is the
fact that turning off the text decoder makes the problem go away (for
me, at least).

BTW, occasionally I can start transmitting with the text decoder on, and
the problem will not occur, and doesn't seem to start during a
transmission, but if I stop and restart, the problem comes back right
away.

I've also reproduced it at different mark ("PITCH") frequencies.

I wonder if it could be some sort of resource contention between the
decoder and the DSP.... or something?

     ~Iain / N6ML