The question was:
Could we produce an resistance output to mimic an existing resistance fuel level reporting system.There would be a few clear benefits:
- We could interface with many more legacy aircraft
- Incorporation of our system in aircraft already using resistance based sending would be easier.
- Aircraft have long wiring runs
- There are multiple sensors and connections
- The connections needed to be ordered to produce a series for multiple sensors
- There were other connections in the aircraft - bad connections produced resistance
- There were multitudes of different resistance values even for the same aircraft
- There were amplifiers in some aircraft to address the issues above
- The wire run was subject to aircraft vibration
- The gauge quality and accuracy in legacy aircraft was - not ideal
- All they needed was an Ohmmeter.
- We had heard stories of Cessna 210 Centurion and Cessna Twin Aircraft with the dreaded Cessna breakout box to tune and diagnose the capacitive system.
We found that Digital Frequency gave us clarity for fuel level information over all the known wiring challenges - corroded contacts, poor splices and induced signals. More importantly it gave us a good signal or nothing - induced errors did not conspire to give bad fuel level.
What seemed more natural is that the signal was similar to that used by the fuel flow transducer. It seemed a natural - and we could read the read and diagnose the signal on a DMM.