Lectronics R400A Quick Start Manual - page 2

LECTROSONICS, INC.

2

1.  Connect the power cord from the power supply to the Power Input Jack.

2.  Attach the antennas or antenna cables to the MAIN ANT and DIV ANT 

BNC connectors.

3.  Press the POWER/PREV MENU button to turn on the unit.  Check to see 

that the LCD displays the three-screen Power Up Sequence:

Lectrosonics

R400A VXX  where XX is the current firmware version installed

Block XX  where XX is the frequency tuning range block number

After the Power Up Sequence is displayed, the Main Window appears and 

the R400A is ready for operation. 

4.  Ensure the receiver and transmitter are set to the same Compatibility 

Mode, then locate a clear operating frequency (see Frequency Coordina-

tion.)  Then set the Transmitter Frequency Select Switches to match the 

receiver’s operating frequency.  (See R400A Menu Options.)

5.  Turn the transmitter on and verify that an RF signal is indicated on the LCD.

6.  Connect an audio cable to the appropriate audio output jack.  Because 

the audio outputs operate independently, external equipment can be 

connected to either, or both output jacks.

7.  Locate a clear operating frequency. The easiest method is to use Smart-

Tune™ and then set the transmitter frequency indicated on the display.

Note:  For more detailed instructions,  see “Using SmartTune

™

 and the 

Scan Function” on page 7.  

8.  Refer to the associated transmitter operating instructions and adjust the 

transmitter gain.

Warning: This is perhaps the most important step in the setup 

procedure.

In general, adjust the transmitter gain so that the voice peaks will cause the 

audio modulation level indicators on both the receiver and transmitter 

to show full modulation on the loudest peak audio levels.  Normal levels 

should cause the R400A’s audio level bar to fluctuate fully resulting in 

the best possible signal to noise ratio for the system.

Note: A common mistake is to use the transmitter audio gain control 

to set the overall audio level of the entire system.  The transmitter gain 

control is not a volume control and must be set independently of the 

overall system audio level.  The transmitter gain control is only used 

to set the proper modulation of the transmitter.  It is used to match the 

transmitter to the type of microphone and the sound levels that will be 

present at that microphone.  We encourage users to either disconnect 

the rest of the sound system or turn the sound system gain to minimum 

to prevent either feedback or overload as the transmitter gain is set.  

Only after the transmitter gain control is set should the gain of the rest 

of the audio system be adjusted to achieve the desired sound or signal 

levels.

Initial Setup