UKHAS badge board with RFM22, Arduino328 with 8Mhz external crystal (no brownout) running off a 1.8v MCP1700 regulator, 2.5V 10F supercap in parallel to badge board. Charged initially by 3.7v lipo to 1.8v and then this supply is removed either to run off the supercap or the solar panel.
Experiments in the feasibility of solar powered aprs tracker
Comment 12/09 09:10 : |("|XX/M6JCX,640 Comment 12/09 09:08 : |(!|XX/M6JCX,639 Comment 12/08 15:21 : |";|XX/M6JCX,119 Comment 12/08 15:19 : |":|XX/M6JCX,118
Its able to restart in the morning and continue transmitting, obviously only sufficient sunlight between 0908 and 1521 to power the radio. This would work a lot better during the summer.