Lectrosonics UDR195 - Manual (Page 10)

REAR PANEL CONTROLS AND FUNCTIONS
VU METER HEADROOM
Since VU meters are too slow to respond to brief transients in audio signals, they do not indicate “peaks” in the audio signal,
however, they do indicate the average levels of the audio signal in the 20dB range below maximum level. A calibrated sensitiv­
ity control is provided on the DR195 rear panel to allow the VU meter sensitivity to be increased so that it will more closely
track the modulation level LED strip with different kinds of program material.
AUDIO OUTPUT
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 when the VU meter indicates “0” so that an exact level can be reliably achieved. The
5dB increment on the output level control matches the 5dB increment on the VU meter headroom control so it is easy to deter­
mine the true output level. For example, with the VU meter headroom control set for 10dB, the actual audio output level will be
*10dB lower than the VU meter indicates. Setting the output level control 10dB higher will compensate for the additional
sensitivity of the VU meter. The Audio Output 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 locking toggle switch reverses the polarity of the audio output signal.
AC POWER SUPPLIES
The DR195 can be powered from conventional 110 or 220 Volt AC supplies via an internationally approved connector. A
standard 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.
3 2
1 4
LECTROSONICS ANTENNA B
CONTACT CLOSURE
EXTERNAL POWER
(PINS 2,3)
NORMALLY OPEN
12-18V DC (NON POLAR)
(PINS 1,4)
RIO RANCHO, NM (800) 821-1121 MADE IN USA
RECEIVER
ANTENNA A PHASE
REV BYPASS
20
15
10
5
0
dB
-5
-10 +10
+5
0
dBu
-15
-20
-25
-30
-35
-40
+15
AUDIO OUTPUT
PILOT
TONE
VU METER
HEADROOM
BUSS: GDC 315mA (160mA) LITTLEFUSE: T 315mA (160mA) (218)
3
2 1
110 2
2
0
Figure 3 - DR195 Rear Panel
10