Re: [Elecraft] Bartg Sprint 75

2010-06-01 Thread Claude Du Berger
: Monday, May 31, 2010 11:09 PM Subject: Re: [Elecraft] Bartg Sprint 75 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

[Elecraft] Bartg Sprint 75

2010-05-31 Thread Claude Du Berger
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 http://www.contestgroupduquebec.com/ http://sites.google.com/site/va2upcontesting/Home

Re: [Elecraft] Bartg Sprint 75

2010-05-31 Thread Lyle Johnson
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?... I just read the rules. The shift is not specified, only the data rate as being 75 bps rather than 45 (or 45.45) bps. The K3 DualPB filter for AFSK or

Re: [Elecraft] Bartg Sprint 75

2010-05-31 Thread Joe Subich, W4TV
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, ...