Lectrosonics DR185 - Manual (Page 7)

Ratio Diversity Receiver
OPERATING INSTRUCTIONS
1) Connect the power supply.
2) Attach and place the antennas.
3) Connect the audio cable.
4) Set the front panel switch to the “MUTE” position. Check to see that the red POWER LED lights up (the leftmost
LED in the 9-LED display).
5) Adjust the transmitter “gain”. THIS IS PERHAPS THE MOST IMPORTANT STEP IN THE SET UP PROCEDURE.
See your transmitter manual (Operating Instructions section) for specific directions on the proper gain adjustment
of your particular transmitter.
6) After adjusting the transmitter gain, move the OFF/MUTE/ON switch to the “ON” position.
7) Operate the system and adjust the receiver output level as required for your equipment. The input levels on
different VCR’s and PA equipment vary, which may require that you set the OUTPUT ATTENUATOR control in an
intermediate position. Try different settings and listen to the results. If the output of the receiver is too high, you
may hear distortion or a loss of the natural dynamics of the audio signal. If the output is too low, you may hear
steady noise (hiss) along with the audio.
INDICATOR QUICK REFERENCE
RF LEDs -- The “A” and “B” LEDs light when the transmitter is turned on and the receiver is picking up a strong
enough carrier to provide a good audio signal.
POWER -- The leftmost LED in the 9-LED display lights up when the receiver is properly connected to a power supply
and switched on.
MODULATION -- The audio level is indicated by 9 LEDs on the front panel. The normal operating level occurs when
the intermediate (green) LEDs are lighting up with the audio. The rightmost LED (yellow) lights up when the audio
level is high and the signal is being compressed in the transmitter. An extremely high audio level may cause distor­
tion. If none of the LEDs light up when audio is being produced through the system, the audio level is too low, which
may produce audible background noise (hiss) in the audio. The audio level is adjusted with the transmitter GAIN or
MIC LEVEL control.
OPTI-BLEND LEDs -- These LEDs indicate the blending action of the panning circuit in response to the comparison
of signal to noise ratios in the two receivers. The audio from either receiver is being mixed into the blend when the
corresponding LED lights up. The brightness of these LEDs varies in proportion to the amount of audio being utilized
from the associated receiver.
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