Lectrosonics UDR195 User Manual
Page 11
Wireless Diversity Receiver
EXTERNAL POWER JACK
The DR195 can be powered from external 12 to 18 Volt DC sources via the four pin XLR jack. The jack is non-polarized
between pins 1 and 4. Internal relays correct the polarity automatically if reverse polarity is connected. By using relays to
correct the power supply polarity, there is no voltage drop, as would occur in a diode bridge circuit. The relays and power
supply stage are fully protected by automatic reset poly fuses. The ground side of the power supply is protected with a self
resetting poly fuse in case the DR195 is connected to a positive ground device through the audio cabling. The poly fuse will
trip to protect the receiver and the offending ground path can then be removed.
CONTACT CLOSURE
This switch is used to activate an external device, such as a tape recorder or an external relay. The switch is keyed to the pilot
tone squelch function of the receiver. When the squelch opens, a contact closure (or opening) is activated at this connector.
Pins 2 and 3 of the four pin XLR connector can be configured for “normally open” or “normally closed” operation. The unit is
shipped from the factory in the “normally open” position, which means that there is a short between pins 2 and 3 of the four pin
XLR when there is a pilot tone present.
The PILOT TONE BYPASS switch defeats the action of the relay. With the pilot tone bypassed, the relay will remain shorted
until the power to the receiver is turned off, regardless of the presence of a pilot tone carrier. To return to pilot tone use, switch
the receiver power completely off then back on.
PILOT TONE BYPASS
This switch defeats the audio output muting and triggering action of the pilot tone. When the pilot tone is bypassed, the Opti-
Blend and the Variable Cutoff Low Pass Filter will still provide a squelching action during weak signal conditions. These
circuits will provide approximately 50 dB of muting when the pilot tone is bypasssed.
ANTENNA JACKS
These are standard 50 Ohm BNC terminals for the RF input to the receiver.
Rio Rancho, NM – USA
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