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 > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html