2 ms·
You know I didn't think about this at all. But the flight manual mentions multiple power systems in the aircraft and one of them is of course 400 Hz. I wonder
by sidewndr46 3y ago
You know I didn't think about this at all. But the flight manual mentions multiple power systems in the aircraft and one of them is of course 400 Hz.
I wonder if when these recordings were made someone was actually powering up the whole aircraft by running an external APU of some kind?
- psunavy03 3y agoI think the B-58 used an air starter, not an APU.
- crmd 3y agoIt could have been recorded in the aircraft (running under its own power or on shore power), or in the shop running off a bench AC power supply. Either way, if the unit's power supply filter capacitors are degraded (which is very likely), then the AC power supply frequency will leak into the audio output. I deal with this nonstop servicing audio amplifiers from the same era as the the B-58.