[RTTY] 300hz or 500hz IF filter?

[Bill Turner]

ORIGINAL MESSAGE:          (may be snipped)

On Sun, 25 Aug 2013 11:09:19 -0700, Chen wrote:

>The 1.2 factor is purely empirical.  But if you follow the ITU formula 
>religiously, steam RTTY comes out as having a bandwidth of 
>249.45 Hertz. 

REPLY:

Why would anyone follow a formula that doesn't work in the real world?

Any RTTY operator with any significant experience knows that a bandwidth of
exactly 249.54 Hz will not work. The print will be just garbage. The actual,
true, honest bandwidth has to incorporate more spectrum than that or you are
just wasting your time. Don't be fooled by what someone calls a "250 Hz"
filter. If it actually works, it's letting more spectrum through than that. 

Long experience has shown that around 300-350 Hz on the typical ham receiver
works. Less does not.

Can we at least agree on that?

73, Bill W6WRT