TH-D72A/E - N3UJJ
TH-D72A/E - N3UJJ TH-D72A/E - N3UJJ
6 OPERATIONAL EXAMPLES OF APRSMenu ItemTable 6-2 Configuration ExampleConfigured ValueLOW SPEED 5HIGH SPEED 70SLOW RATEFAST RATE30 minutes120 secondsTable 6-3 Variable Rate Beaconing Example:(with LOW SPEED = 5, HIGH SPEED = 70, SLOW RATE = 30 min, FAST RATE = 120 sec)SpeedTX interval Time (FAST RATE = HIGH SPEED ÷ Speed)80 120 seconds (2 minutes)70 120 seconds (2 minutes)60 140 seconds (2 minutes and 20 seconds)50 168 seconds (2 minutes and 48 seconds)40 210 seconds (3 minutes and 30 seconds)30 280 seconds (4 minutes and 40 seconds)20 420 seconds (7 minutes)10 840 seconds (14 minutes)5 1680 seconds (28 minutes)0 1800 seconds (30 minutes)(min.)35Speed vs TX Interval Time30TX Interval Time2520151050 10 20 30 40 50 60 70 80SpeedFigure 6-4 Speed vs TX Interval TimeNote: The unit of Speed can be configured by using Menu 3V0.6.1.5.2 Corner Pegging (Transmission after Heading Change)When the mobile station’s speed is above LOW SPEED, Corner Pegging begins operating. A CornerPegging position beacon will be transmitted when the heading difference (the compass heading of thepresent direction of travel subtracted from the compass heading transmitted in the previous positionbeacon) exceeds the threshold value. The heading difference is the compass heading of the presentdirection of travel (in degrees) subtracted from the compass heading transmitted in the previousposition beacon. (Technical note: only the absolute value of the heading difference, normalized to thefirst and second quadrants, is used.) The threshold value called TURN THRESHOLD combines a fixedangle threshold, called TURN ANGLE, with a constant called TURN SLOPE, times ten, divided by thepresent speed. You can use the formula below to calculate TURN THRESHOLD.44 CONTENTS TH-D72A/EFrom The N3UJJ.COM Document Library
6 OPERATIONAL EXAMPLES OF APRSBy changing the value of TURN SLOPE, you can adjust how Corner Pegging responds as the mobilestation executes curves. When the value of TURN SLOPE is increased, a large heading angle changeis necessary to cause a position beacon transmission, especially at low speeds. When the value ofTURN SLOPE is reduced, the effect of speed on Corner Pegging is reduced, as the constant TURNANGLE becomes the controlling term in the equation. A value for TURN SLOPE of 110 (in units of 10degrees per mph) has been experimentally determined to be a good value for vehicles on typical roads.Corner Pegging Formula:TURN THRESHOLD = TURN ANGLE + 10 x TURN SLOPE / SPEEDThe above formula is based on the reality of how a mobile station executes turns: when traveling atslow speed, it can turn acute angles, but when traveling at high speeds, it turns only shallow angles.In other words, TURN THRESHOLD varies inversely with speed: at a low speed, the thresholdbecomes large, while at a high speed the threshold becomes small.To prevent the Corner Pegging beacon from transmitting too often and causing QRM, there is a timervalue called TURN TIME. The Corner Pegging position beacon is not transmitted until TURN TIMEseconds have elapsed since the previous beacon transmission, regardless of which method (CornerPegging or Variable Rate Beaconing) caused the previous beacon.Table 6-4 Conditions for Corner Pegging OperationOver HIGH SPEEDSpeedUnder HIGH SPEEDOver LOW SPEED(Only when HIGH SPEED ≥ LOW SPEED)Under LOW SPEEDCorner PeggingYesYesNoSpeedMenu ItemTable 6-5 Configuration ExampleTable 6-6 Corner Pegging Operation Example: (with TURN ANGLE = 28, TURN SLOPE = 26)TURN SLOPENote: When TURN THRESHOLD exceeds 120°, the value will be corrected to 120°.Configured ValueLOW SPEED 5TURN ANGLE 28°TURN SLOPETURN TIMETURN SLOPE/ Speed(Cut off after the decimal point) (1)26 (x10°/speed)30 secondsTURN ANGLE (2)TURN THRESHOLD (3)= (1) + (2)80 26 (x10) 3° 28° 31°70 26 (x10) 3° 28° 31°60 26 (x10) 4° 28° 32°50 26 (x10) 5° 28° 33°40 26 (x10) 6° 28° 34°30 26 (x10) 8° 28° 36°20 26 (x10) 13° 28° 41°10 26 (x10) 26° 28° 54°5 26 (x10) 52° 28° 80°2 26 (x10) 130° 28° 158° 120°TH-D72A/E CONTENTS 45From The N3UJJ.COM Document Library
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6 OPERATIONAL EXAMPLES OF APRSMenu ItemTable 6-2 Configuration ExampleConfigured ValueLOW SPEED 5HIGH SPEED 70SLOW RATEFAST RATE30 minutes120 secondsTable 6-3 Variable Rate Beaconing Example:(with LOW SPEED = 5, HIGH SPEED = 70, SLOW RATE = 30 min, FAST RATE = 120 sec)SpeedTX interval Time (FAST RATE = HIGH SPEED ÷ Speed)80 120 seconds (2 minutes)70 120 seconds (2 minutes)60 140 seconds (2 minutes and 20 seconds)50 168 seconds (2 minutes and 48 seconds)40 210 seconds (3 minutes and 30 seconds)30 280 seconds (4 minutes and 40 seconds)20 420 seconds (7 minutes)10 840 seconds (14 minutes)5 1680 seconds (28 minutes)0 1800 seconds (30 minutes)(min.)35Speed vs TX Interval Time30TX Interval Time2520151050 10 20 30 40 50 60 70 80SpeedFigure 6-4 Speed vs TX Interval TimeNote: The unit of Speed can be configured by using Menu 3V0.6.1.5.2 Corner Pegging (Transmission after Heading Change)When the mobile station’s speed is above LOW SPEED, Corner Pegging begins operating. A CornerPegging position beacon will be transmitted when the heading difference (the compass heading of thepresent direction of travel subtracted from the compass heading transmitted in the previous positionbeacon) exceeds the threshold value. The heading difference is the compass heading of the presentdirection of travel (in degrees) subtracted from the compass heading transmitted in the previousposition beacon. (Technical note: only the absolute value of the heading difference, normalized to thefirst and second quadrants, is used.) The threshold value called TURN <strong>TH</strong>RESHOLD combines a fixedangle threshold, called TURN ANGLE, with a constant called TURN SLOPE, times ten, divided by thepresent speed. You can use the formula below to calculate TURN <strong>TH</strong>RESHOLD.44 CONTENTS <strong>TH</strong>-<strong>D72A</strong>/EFrom The <strong>N3UJJ</strong>.COM Document Library
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