: 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
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
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
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,
...
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