Lectrosonics UCR190 - Manual (Page 5)

UHF Compact Receiver
EXT/OFF/INT BATT SWITCH
Turns the receiver power off and on and selects either internal 9 Volt battery power, or external 12 Volt DC power (of
either polarity).
POWER LED
Glows when the power switch is in the proper position and the battery is good, or when external 12 Volt DC power is
properly supplied. If this LED is very dim or does not light up when the switch is turned on, replace the battery or
check the connections from the external power source. The LED glows brightly to indicate a good battery and dims
as the battery voltage decreases.
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 battery. As the battery voltage drops during use, the LED brightness will
also decrease. After 4 to 5 hours, the battery voltage will be about 7 volts. The LED will be completely extinguished.
IMPORTANT!
When the battery voltage drops below 6 Volts, the power LED will remain off, but the other 3 LEDs will light up and a loud rush
of audio noise will be heard as the squelch opens. This condition is normal, and is easily remedied by replacing the battery.
Since the internal circuits are all tightly regulated the receiver will continue to operate to a battery voltage of 6.5 volts.
From 6.5 volts to 6 volts, the receiver will still operate, but with degraded performance. Below 6 volts, the regulated
and temperature compensated squelch circuit will cease to be regulated. The result is that the squelch circuit will
remain “open”. This will allow considerable noise to pass through the audio circuits if the associated transmitter is off,
or if other circuits of the UCR190 stop operating because of the low voltage condition. In addition, three out of the
four LEDs on the front panel will light (the exception being the POWER LED). 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. Regular installation of fresh batteries will insure optimum operation.
RF LED
Lights when the transmitter is turned on and the receiver has a good signal. When the carrier signal from the trans­
mitter is too weak to produce a clean audio signal, the lamp will go out.
MINI PHONE JACK
Provides a monitor, separate from the rear panel XLR audio output. The output level from this jack is controlled by
both the OUTPUT control and the recessed trim-pot on the side panel. Generally, the OUTPUT control would be set
to provide the proper output level at the rear panel XLR jack, and then the side panel trim-pot adjusted to match the
required level for your earphone.
The output at this mini connector is designed for a medium impedance earphone. An earphone with an impedance
between 30 and 300 Ohms will usually provide adequate volume. The sound from a low impedance ear phone (ie. 8
Ohms) will not be very loud and may be distorted at higher listening levels.
ANTENNA JACK
Connects to any 50 ohm antenna with a BNC type connector (a flexible “rubber duckie” antenna is supplied). The A­
185 Coax remote type antenna may also be used.
Rio Rancho, NM – USA 5