Hello Richard et al,
I've experienced some unexpected extreme oscillations on an aircraft I've had set up with iGyro SRS for a couple of years and many flights. So I have confidence in the gain and speed factor settings.
When landing I've noticed that the display is showing 'No Sensor'. A receiver power cycle returns the status to 'searching' and then 'Logged In'
This has happened on 3 separate occasions, so I investigated (yes I'm an engineer). This is a summary of what I found.
1. It only occurs if your power up the receiver before the transmitter - I know you shouldn't but it's easily done and in the era of 2.4GHz gear it's no longer an issue - normally.
2. When you power up the transmitter and the receiver locks - the 'No sensor' status persists and the gain is at its maximum level. On a GPS II device the slow flashing green led changes, after 10-20 seconds to rapid flashing.
3. If you restart the receiver then normal 'searching' and 'logged in' status results.
I can't be sure but I think the behaviour is different on version 23 - only this one aeroplane had version 24. now all are at v25 and behave the same way. My other devices were all on version 23 and I think they consistently worked with the GPS sensor and soon as the Tx was switched on. I can't revert to v23, because I upgraded to v25 before I suspected v24/25 might be a problem.