Necessary bandwidth for 75 baud 170 Hz shift RTTY is
about 360 Hz - approximately (75/2 * 5 + 170). A 400
Hz roofing filter is probably close to optimum for
75 baud RTTY.
Note - 200 Hz is theoretically too narrow for even 45.45
baud RTTY (necessary bandwidth approximately 280 Hz).
73,
... Joe, W4TV
On 5/31/2010 9:38 PM, Claude Du Berger wrote:
> Hello Group.
> June 12 is the Bartg Sprint 75 (test) Contest.
> At this speed, what is the best filter to use and can we
> still use the so sharp Dual PB?
>
> Claude Du Berger VE2FK
> ve...@arrl.net
>
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