[RTTY] 300hz or 500hz IF filter?

[Kai]

Or as is oft quipped, "In Theory, theory and practice are the same, in Practice, 
they are not!"
-Kai, KE4PT

On 8/23/2013 1:17 PM, Paul wrote:
> Theory seldom, if ever, approaches practice <grin>.
>
> de Paul, W8AEF
>
> -----Original Message----- From: Bill Turner
> Sent: Friday, August 23, 2013 9:42 AM
> To: RTTY Reflector
> Subject: Re: [RTTY] 300hz or 500hz IF filter?
>
> ORIGINAL MESSAGE:          (may be snipped)
>
>
>
> REPLY:
>
> Jay has summed it up well. Practical, on the air testing is always the best.
> Theory can point in the right direction and might save some time, but the
> acid test is on the air.
>
> For example, I operated RTTY for years with an IC-756Pro3 using a 250 Hz
> filter and it was very satisfactory. About two years ago I upgraded to an
> IC-7600 and set it to 250 Hz as well. I was quite disappointed in the copy.
> Even on strong signals, there were many errors in the print.  On a hunch, I
> widened the filter out to 300 Hz and reception returned to satisfactory. The
> difference was the '7600 had steeper skirts than the 'Pro3. The point is,
> just stating an "optimum" filter bandwidth is too simplistic. It depends on
> other variables.
>
> Theory helps, but "cut and try" will give the final answer.
>
> 73, Bill W6WRT
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