Transponder 101
Transponder 101
Theory of operation:
Antenna configurations for BOAT patterns (BAPM):
Antenna configurations for WALKING patterns (WAPM):
Measuring a transmit antenna pattern with transponder in continuous wave (CW) mode:
Transponder parts:
Charging the battery:
Charge the battery overnight. A fully charged battery will read 12-15VDC. The transponder will stop responding and its signal peak will disappear at around 5-6 volts. The battery voltage gradually drops in steps of 0.1-0.5 volts until it reaches 9 volts and then it will drop quickly to 5 volts in ~ 10 minutes. You can expect the transponder to work for 7.5 to 8 hours with a battery that is in good condition and fully charged.