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#81
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Battery Source
I can confirm that my Walter Dittel FSG71M functions flawlessly on
input voltages between 9 V and 14 V when powered from a variable voltage bench supply. RF output looked pretty constant, except it dropped a little when supply was under 10 V. The first instrument to complain about low voltage was my SN-10 and then my Volkslogger - they get unhappy under 10 V. My four-year old nominally 12 V battery starts out at around 12.5 V at the beginning of a flight and ends up at 11.8 or so after 5 hours. Bus voltage drops about 0.4 V on radio transmit. Current demand from my instruments, including radio on receive, is 0.28 A at 14 V and 0.39 amps at 10V and a pretty constant 0.31 amps on battery. A five-hour flight consumes about 2 Ah, about a third of the capacity of a fresh battery. I have no need for a 14 V supply with my instruments. Mike |
#82
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Battery Source
Actually, it is an FAA requirement too. The VHF radio TSO-C37
references RTCA DO-160, DO-178A and DO-186. Part of the data submission requirements by the manufacturer to the FAA include (this is from the TSO): "(viii) The results of the environmental qualification tests conducted in accordance with RTCA/DO-160C." Tom |
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