The gain adjustment on the G490T gyro departs from the usual JR system and uses a single receiver channel to control both the heading hold/rate mode selection and the gyro gain in each mode.

                                         Rate Mode (Normal)                                    Heading Hold ( Tail Lock)

Heading Hold Mode

The gyro gain channel travel adjustment in the positive direction sets the gyro gain in Heading Hold Mode, with 0% travel volume giving 0% gyro gain and 100% travel volume giving 100% gyro gain. The gyro gain channel travel volume and Heading Hold Mode gyro gains always correspond

Rate (Normal) Mode

The gyro gain channel travel adjustment in the negative direction sets the gyro gain in Rate Mode, with 0% travel volume giving 0% gyro gain and 100% travel volume giving 100% gyro gain. The travel volume and Rate Mode gyro gains always correspond.

It's as simple as that.

The G490T set-up is a little more difficult to understand when using the "GYRO GAIN" feature of the PCM10X (AUX3 channel used to control the gyro gain) and PCM9X/X-3810/X-378 (AUX2 channel used to control the gyro gain).

Heading Hold Mode

Transmitter gyro gain settings between 50% and 100% adjust the heading hold gain, with 50% transmitter gyro gain corresponding to zero Heading Hold gyro gain and 100% transmitter gyro gain corresponding to 100% Heading Hold gyro gain.   A 1% INCREASE in transmitter gyro gain gives a 2% INCREASE in Heading Hold gyro gain.

Rate (Normal) Mode

Transmitter gyro gain settings between 0% and 50% adjust the Rate Mode gain with 0% transmitter gyro gain corresponding to 100% Rate Mode gyro gain and 50% transmitter gyro gain corresponding to zero Rate Mode gyro gain The Rate Mode gain of the gyro INCREASES as the transmitter gyro gain setting DECREASES!  A 1% DECREASE in transmitter gyro gain gives a 2% INCREASE in Rate Mode gyro gain.

Of course, when using a JR gyro such as the G5000T or G6000T, the transmitter and gyro gains correspond and there are none of the above complications.

The moral is clear:   Use the transmitter travel adjustment to set the gain on the G490T gyro.

Additional notes:

If you have a digital or super servo, set the standard/high rate switch on the gyro to the high position to take advantage of the superior performance.   Standard servos require the switch to be in the standard position.

Repair/Service Instructions:

For service or guarantee repair, UK supplied 490T gyros should be returned to:

MacGregor Industries Ltd.,
Canal Estate,
Langley,
Slough,
SL3  6EQ.