If that function is INHibited, you are limited to using channel 5 -- the GEAR channel (and its attendant end-point settings) to control your gyro's gain and mode.
To use the GEAR channel (channel 5) to control the gyro's gain and mode, you need to go into the INPUT SELECT menu and enable the GEAR function.
Then, plug the single wire gain lead into channel 5 of your RX. The GEAR switch has two positions, UP and DOWN. Unless you have REVersed the GEAR switch function, with the toggle UP, the GEAR channel will select Heading Hold mode in the gyro. The endpoint numbers that you set that are associated with this switch position selects gain in HH mode. It is THIS position that the switch needs to be set to, when powering up the RX, as the 401 MUST be started up in HH mode. The red LED on the gyro will go on solid after initialization to indicate that the gyro is in HH mode.
With the GEAR toggle in the DOWN position, the gyro will be set to NORMAL/RATE mode, and the endpoint number associated with THAT switch position will set the gain for normal/rate mode operation.
When using the GEAR channel to control gyro gain and mode, the gyro will respond as shown in this picture:
-----If you enable the GYRO SENSITIVITY feature, you will have to have at least a 7-channel receiver, as the gyro gain control under this menu expects the gyro's gain lead to be plugged into channel 7 (Aux 2).
If you only have a six channel RX, the GYRO SENS menu will do you no good.
With the GYRO SENS menu enabled, you have two choices to select the gyro gain -- AUTO, and RUDD D/R.
If you choose AUTO, the FLIGHT MODE switch controls the gyro gain, and you can set a different (or the same) gain for each of the three positions of the flight mode switch. If you go THIS route, the AUX 2 setting in the INPUT SELECT menu must be set to "INH", as this mode maps the flight mode switch to the AUX 2 (channel 7) output.
If you choose RUDD D/R, the position of the Rudder Dual Rate switch is what sets the gyro gain. This is also what JR calls "manual" gain mode.
If you choose AUTO, have AUX2 set to INH in the INPUT SELECT menu, and you have plugged the gyro's gain lead into channel 7 of your RX, then in the GYRO SENS menu you will see two "RATE" options in the gyro sense menu, they appear as:
You will also see an "F. MODE" setting in the gyro sense menu, it looks like:
(If you have enabled the Throttle Hold feature, the F. MODE stuff will have a "HOLD: X" entry, as well). If you don't have Throttle Hold enabled, you won't see the HOLD: X entry.
For the RATE setting, numbers greater than 50 select Heading Hold operation, numbers less than 50 select Normal/Rate mode operation.
If you set the RATE 0: number to 75, and the RATE 1: number to 80, you will have two different HH gain numbers selected. If you have the RATE 0: number set to 25 and the RATE 1: number set to 40, you will have two different normal mode gains to select from. If you have the RATE 0: number set to 75, and the RATE 1: number set to 25, you will have a HH gain value, and a normal mode gain value (same goes for RATE 0: number set to 25, RATE 1: number set to 75 -- one gain for normal mode, one gain for HH mode.
The F. MODE value can be 0 or 1, and selects which of the RATE numbers to use.
If you have:
RATE 0: 75
RATE 1: 25
and F. MODE set to
Then when the Flight mode switch is in Normal (towards the rear of the TX) position, the gyro gain will be set by the 75 number, and you will be in Heading Hold mode. With the Flight Mode Switch in STNT1 (middle position), or STNT2 (towards the front of the TX), the gyro gain will be set by the 25 number, and you will be in NORMAL MODE.
The gyro gain in Throttle Hold will be set by the 75 number, and you will be in HH mode.
Should you choose RUDD D/R instead of AUTO, the gyro gain lead must STILL be plugged into RX channel 7, and the gain/mode is controlled by the two-position RUDDer Dual Rate switch (short switch, top right, front corner of TX).
You will only have the RATE mode values in the GYRO SENS menu.
RATE 0: X
RATE 1: X
The gyro gain and mode is controlled by the Rudder Dual Rate switch.
Values of 50 or greater select HH mode, and it's gain, values of 50% or less select Normal mode, and its gain. So you can have two HH modes with different gains, two Normal modes with different gains, or one of each mode with its gain.
If using the GYRO SENSE menu, whether AUTO or RUDD D/R, the gyro gain and mode follow the description in this picture:
Remember, whatever way you choose to operate the gyro's gain and mode, the 401 MUST be initialized at power on in HEADING HOLD mode.
Failure to do so will cause erratic behavior of the gyro and it won't hold well and may very well drift randomly.
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