Kenwood TH-D72A/E User Manual

Also see for TH-D72A: Instruction manual Instruction manual Instruction manual Instruction manual Service manual

Contents

6 OPERATIONAL EXAMPLES OF APRSTH-D72A/E CONTENTS 43Refer to the diagram below to understand what occurs when both Decay Algorithm and ProportionalPathing are used at the same time.Figure 6-3 Switching between Decay Algorithm and Proportional Pathing(when Stopped = 1 (knot); Moving = 3 (knots))As the example above shows, when the mobile’s speed exceeds 3 knots, Decay Algorithm stops andProportional Pathing begins. Similarly, when the mobile’s speed drops below 1 knot, thenProportional Pathing stops and Decay Algorithm begins.Note: The Stopped value cannot be configured higher than the Moving value. Also, the Moving value cannot be configuredlower than the Stopped value.SmartBeaconing was developed by Mr. Steve Bragg, KA9MVA, and Mr. Tony Arnerich, KD7TA, in1998. SmartBeaconing uses the speed information that is received from the GPS receiver andtraveling direction to efficiently transmit the beacon. There are two factors that come into play whendetermining how SmartBeaconing functions: distance traveled since last beacon transmission,addressed by using Variable Rate Beaconing to change the transmission interval with speed, andheading change since last beacon transmission, referred to as Corner Pegging.When your mobile station is moving at a speed less than LOW SPEED as set in the menu, theposition beacon repeatedly transmits at the interval of SLOW RATE as set in the menu. When yourmobile station is moving faster than HIGH SPEED as set in the menu, the position beacon repeatedlytransmits at the interval of FAST RATE as set in the menu. And if your mobile is traveling at anyspeed between LOW SPEED and FAST SPEED, then the beacon transmits at an interval that varieslinearly according to the speed traveled. The transmission interval extends longer as the speedbecomes slower, and the interval becomes shorter as the speed gets faster.Table 6-1 Relationship between Speed and Beacon Transmission Interval6.1.4 Simultaneously using Decay Algorithm and ProportionalPathing6.1.5 SmartBeaconing (Written by Steve Bragg, KA9MVA)6.1.5.1 Variable Rate Beaconing (Transmission Interval Changes with Speed)Speed Transmission IntervalOver HIGH SPEED FAST RATEUnder HIGH SPEEDOver LOW SPEED(Only when HIGH SPEED ≥ LOW SPEED)(Only when HIGH SPEED ≥ LOW SPEED)FAST RATE x HIGH SPEED / current speed = transmission interval timeUnder LOW SPEED SLOW RATENowProportionalPathingReturnsto DecayAlgorithmVelocity (Knots)Status1220 33 35Decay Decay DecayProportional Proportional Proportional Proportional