Lectrosonics UDR200a - Manual (Page 5)

Wireless Diversity Receiver
REAR PANEL CONTROLS AND FUNCTIONS
AUDIO OUTPUT DC IN
A calibrated control on the rear panel adjusts the output level in
5 dB steps, referenced in dBu. This control knob adjusts the
absolute output level at the XLR connector. The AUDIO OUT­
PUT level control is located after the output transformer. This
allows the signal to noise ratio to remain constant regardless of
the setting of the control. As the audio level is reduced, the
noise is also reduced maintaining the same ratio.
PHASE REV
This switch reverses the polarity of the audio output signal.
AC POWER SUPPLIES
The UDR200 can be powered from conventional 110 or 220 Volt
AC supplies via an internationally approved connector. A stan­
dard grounded socket, fuseholder and voltage selector switch are
combined into a single assembly. The fuseholder also contains a
spare fuse. To remove the fuseholder, simply pry it out with a
screwdriver or similar tool (it pulls straight outward from the
assembly). To select the operating voltage, disconnect the AC
power and then turn the voltage selector (located to the left of the
fuse) using a flatblade screwdriver or other similar tool so that the
desired voltage is lined up with the mark at the top.
The receiver can be powered from external 12 to 14 Volt DC
sources via the three pin jack. Pin 1 is GND, Pin 2 is +12V,
and Pin 3 is –12V. 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 UDR200 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.
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.
NOISE FILTER
A dynamic noise reduction filter can be switched in to minimize
excessive high frequency audio noise present in the acoustic
environment, or generated by the RF link in difficult environ­
ments or operating distances.
ANTENNA JACKS
These are standard 50 Ohm BNC terminals for the RF input to
the receiver.
ANT B
RECEIVER
BUSS: GDC 315mA (160mA) LITTLEFUSE: T-315mA (160mA) (218)
-5
-10 10
5
0
dBu
-15
-20
-25
-30
-35
-40
15
PHASE PILOT
BYPASS
ANT A
LECTROSONICS
RIO RANCHO, NM - (800) 821-1121
OUT
DC IN
14.4V
MAX
0 180
3
2 1
M
1
2
3
NOISE
FILTER
3: –12
2: + 12
1: GND
AUDIO OUTPUT
Figure 2 - UDR200 Rear Panel
Rio Rancho, NM – USA 5