Range Test. Spektrum SPM7800C, DX7s 7-Ch, DX7s 7-Ch DSMX Radio System, SPM55101, DX7s Transmitter Only MD2, SPMR7800

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Mixing

Mixing allows control input for a channel to affect more than one channel at a time. Mixing functions support:

• Mixing a channel to another channel.

• Mixing a channel to itself.

• Designating offset or where zero movement is for the secondary channel.

• Linking primary to secondary trim.

• Assigning a mix to a switch position.

These mixes are available for each model memory: six programmable mixes, Cyclic to Throttle (HELI) or Elevator to Flap (ACRO) and Aileron to Rudder (ACRO).

Select a channel for master and slave. Inputs for the master channel control both the master and slave channels. For example ELE > FLP makes elevator the master channel and flap the slave channel.

Not all programmable mixes have Offset. Change offset value to change the effective center position of the slave channel in one direction (negative in one direction and positive in the other direction).

Set Trim to Act to make primary channel trim adjustment change the secondary channel trim.

A channel monitor on the left side of the screen shows how channels respond to input. An assigned switch must be in an activating position for a mix to show on the monitor.

You can activate ACRO mixes by an assigned switch. HELI mixes are active in one or more assigned flight modes: N (normal),

1 (Stunt 1), H (Hold) and M (Mix). See Flight Mode and Switch

Select for assignment of flight modes to switches and switch positions.

CAUTION: Always do a Control Test of your model after changing mixes.

Range Test

Always do a radio system range test before each flying session, especially when flying a new model.

All Spektrum aircraft transmitters incorporate a range testing system which, when activated, decreases output power for a range test.

1. With the system powered on and the model restrained, stand

30 paces (approximately 90 feet/28 meters) from the model.

2. Face the model with the transmitter in your normal flying position and put the transmitter into range test mode.

3. Operate the controls while holding the trainer/bind button.

You should keep full control of the model at 30 paces (90 feet/28 meters).

4. If the model does not respond correctly to controls, make sure receiver antennas, receiver, servos and power supply are operating correctly.

5. Release the trainer/bind button to return transmitter output to full power.

6. Doing a range test while using a telemetry module will display the flight log data on the transmitter screen.

Advanced Range Testing

For models containing large amounts of conductive material, use a Flight Log for an advanced range test.

The advanced range test confirms that the receivers are operating correctly in their installed positions.

The Flight Log shows RF performance of each receiver. Two people are required for doing the advanced range testing.

1. Connect a Flight Log (SPM9540) to the main receiver’s data port and power on the system (transmitter and receiver).

2. Press the button on the Flight Log until the F- frame losses are displayed.

3. Stand 30 paces (approximately 90 feet/28 meters) away from the model, then face the model with the transmitter in your normal flying position.

4. Put your transmitter into range test mode and decrease the transmitter’s power output.

5. Operate the transmitter controls while holding the trainer switch. You should have full control of the model at 30 paces

(90 feet/28 meters) from the model.

6. Have a helper move the model (nose up, nose down, nose toward the transmitter, nose away from the transmitter— similar to how the model will fly) while using the flight log to see the effect of aircraft’s orientation on frame losses.

7. Do this range test for one minute, using the timer on the transmitter. A successful advanced range test shows:

H- 0 holds; F- less than 10 frame losses;

A, B, R, L- Frame losses will typically be less than 100.

Compare relative frame losses. If a receiver has significantly higher frame loss values (two to three times more), do the test again. If the results are the same, move the receivers in the model until results improve.

18 SPEKTRUM DX7s • RADIO INSTRUCTION MANUAL