[RTTY] Problems with AFSK ...

[Jay WS7I]

Looks legal to me.  Less than 2.8 kHz ;-) 8-)


On 5/26/2014 5:29 PM, Joe Subich, W4TV wrote:
>
> Lest anyone doubt the problems with AFSK and users who follow the
> "all knobs to the right" doctrine take a look at the spectrum of
> one lid on WSJT : http://www.w4tv.com/HI8XXX.jpg.
>
> The user is running a tone frequency around 380 Hz and so badly over
> driving the mic preamp in his rig that one can see at least *seven*
> harmonics of the fundamental stretching to over 3 KHz where the TX
> filter finally rolls off - a later observation showed harmonics out
> to the *ninth* at over 3500 Hz.  This idiot destroyed a very good six
> meter opening for most of the eastern half of the US as he was the
> only signal anyone could copy in those minutes he transmitted - the
> only stations worked anyone were those who worked him.
>
> Any doubt about the destructive power of AFSK in the hands of a lid?
> FSK on some transmitters may be a bit "wide" but it's not going to
> ruin an entire band.
>
> 73,
>
>    ... Joe, W4TV
>
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