Lectrosonics H185 User Manual download pdf (Page 5)

The POWER LED is connected to a precision battery test circuit that continuously monitors battery

voltage. The LED is at full brightness with a new 9 Volt alkaline or lithium battery. As the battery

voltage drops during use, the LED brightness will also decrease. After 12 to 15 hours (25 to 30 hours

with a lithium battery) the battery voltage will be about 7 Volts. The LED will be completely

extinguished. Since the internal circuits are all tightly regulated and the RF output stage has a

separate discrete regulator, the transmitter will continue to operate to a battery voltage of 6.5 Volts.

From 6.5 Volts to 6 Volts, the transmitter will still operate, but with degraded performance. Please note

that a weak battery will sometimes light the POWER LED immediately after turn on, but soon will

discharge to the point where the LED will extinguish.

The combination of an accurate battery condition indicator and regulation of all internal circuits

guarantees much longer battery life, as well as consistent performance versus battery life.

MODULATION LEDS: Indicate the proper setting of the MIC LEVEL control.

LEVEL LED: Flickers or glows all the time if the audio volume is adequate for normal operation.

LIMIT LED: Lights up when the audio volume is high, indicating that the signal level is being limited by

the compressor. Optimum signal-to-noise ratio is obtained when the limit LED lights occasionally.

MIC LEVEL: Used to adjust the audio input volume for the proper modulation level. Rotate knob until

the LEVEL LED flickers when there is an input signal. The LIMIT LED should light occasionally.

Figure 3 - Top View and Control Panel

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Lectrosonics H185 User Manual Page 5