•
“Channel busy detect”
- this option selects if channel busy is detected by input
signal amplitude (
“analog signal level”
) or with proper packet start detection
(
“digital detect”
). The second option allows to work with open-squelch on the
radio, but it can lead to some packet collisions. The first option is default and
should be used in most cases,
•
“Consecutive packet send”
- this option will make your device send all the
packets from TX queue one after another without any delays (
“in bursts”
), or
with TX delay, Quiet time, and channel busy detection between every packet
(
“separately”
). The first one is default and used by most APRS devices,
•
„TX/RX frequency [Hz]”
- device operating frequency for both TX and TX.
Checked frequencies range from 144 to 146 MHz.
8.6. Position reports Tab
•
“Position report mode”
- selects position report mode,
•
“SmartBeaconing”
- algorithm which sends position reports with intervals
dependent on speed and course, allowing for more accurate reporting
especially in urban area,
•
“Fixed time interval”
- packets are sent every with a fixed time interval,
•
“SmartBeaconing”
is an algorithm invented by Tony Arnerich KD7TA and Steve
Bragg KA9MVA,
•
“Min Turn Angle [deg]”
- this is a minimum heading change which causes
an immediate position report packet send,
•
“Turn Slope”
- this value is a coefficient used to modify heading change
necessary for immediate position report packet send.
These two values are used in the following formula: turn_threshold = min_turn
turn_slope/speed. Default value for min_turn_angle is 27 degrees, turn slope is 410. So
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