emergency power/high power/low power mode
the satellite's power system monitors the battery voltage and switches between high power mode (continuous transmission) when sunlight is charging the battery and low power mode (40 seconds transmit/2 minutes idle) when in eclipse. the satellite experienced a reset during an eclipse period 11 aug (i.e. met reset to 0). once a reset occurs the 15 minute delay timers start. at the end of that delay the battery voltage is sampled to determine whether to go into low power, high power or emergency power. please monitor the arissat1.org page for the latest news.
telemetry data shows that the arissat-1 battery voltage is decreasing each eclipse period. it therefore is taking longer for the battery to charge up to 32.5v to allow the switch from low power to high power when the satellite enters an illumination period.
kenneth ransom, n5vho has plotted the battery min/max for the last 8 days. the data shows that the battery voltage is decreasing at a faster rate than expected. the effect of this is that arissat-1/kedr remains in low power mode for a period of time after exiting eclipse. the team recommends that users take advantage of the high power mode as much as possible over the next few days.
