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Duty Cycle Timers
Battery Powered Doppler PTTs
NANO TimerIt can be programmed to command the PTT to transmit for various ON times; e.g., 8 hours, and then to command the PTT to sleep for various OFF times. This extends the life of the PTT. The clock for the NANO timer is derived from the transmission interval timer, which is usually set at approximately 65 seconds. As the transmission interval is purposely allowed to drift a little, the NANO timer cannot be used to command the PTT on at a precise time of the day. We therefore recommend that it is programmed to have a cycle time that is not a direct multiple of 24 hours. This prevents the ON time of the PTT from becoming locked into a time window when there may be few satellite passes. This timer can be set to the beginning of its ON time by placing a magnet over the STOP switch on the PTT and removing it at the desired start time.
Multi-Season NANO TimerMost versions of the Microwave Telemetry PTT-100 Argos transmitter are now available with a multi-season duty cycle timer. This timer can be programmed to adjust the duty cycle of the transmitter to match each phase of a study, e.g., in a migratory bird study it might be programmed to give a low duty cycle of 6 hours ON/10 days OFF while a bird is nesting, and then switch to an intensive duty cycle of 8 hours ON every second day at the start of migration. When the bird reaches the wintering grounds, it could again be used to slow the duty cycle for the winter (e.g., 8 hours ON/10 days OFF) while the bird may not be making significant movements and then switch to a more intense duty cycle to follow the spring migration. In this way, the limited battery power can be conserved for the crucial phases of the study.This timer can be programmed with up to five seasons each with a different duty cycle.
Duty Cycle for Solar PTTsThe standard duty cycle for 18g, 35g, and 50g conventional solar powered PTTs is 10 hours ON/24 hours OFF. For 5g , 9.5g and12g solar PTTs the standard duty cycle is 10 hours ON/48 hours OFF. These duty cycles are appropriate for solar PTTs deployed in sunny locations. If you are planning to deploy a solar PTT in lower light conditions, please contact us to discuss a customized duty cycle.
Duty Cycle for GPS PTTsGPS PTTs have more sophisticated programming than the simpler Doppler PTTs. You will need to specify at what hours of the day the GPS PTT should take GPS fixes, and at what interval (in days) the PTT should upload the stored location data to Argos. The GPS PTT will transmit the data on an SiV™ schedule during two Argos billing slots of the GMT day. LC4 PTTs come standard with a duty cycle of one GPS fix per day, transmitted every 10 days to Argos. If you wish, we can program your LC4 PTT with a custom duty cycle. More frequent data collection or transmission will shorten the operational life of these battery powered GPS PTTs.