Audio Setup; Compat Mode - Lectrosonics DCR822 Instruction Manual

is to have redundancy in the system for critical produc-
tions, such as live television, to guard against failures
caused by dead batteries and multipath dropouts.
Frequency Diversity requires that the levels of the two
audio channels to be closely matched to avoid au-
dible level changes as the blending action takes place.
In order for this blending to work properly, a special
test mode helps to get the transmitter levels exactly
matched.
Note: In Frequency Diversity mode, both
transmitters must be the same type (usually the
same model). The microphones must also be
placed very close together to minimize comb
filtering.
D i v e r s i t y
F r e q u e n c y
C a l i b r a t e
Frequency Diversity mode, and automatically cancelled
on exiting the diversity setup page. Calibration can be
toggled on and off for testing but will revert to Operate
mode on exiting the diversity setup page.
To prepare for operation in the Frequency Diversity
mode, make the following adjustments:
1. Set up the transmitters according to their instruc-
tions. Verify that both transmitters are set to the
same audio polarity, and set to the same input gain
level. Turn them on to transmit, and verify that audio
and RF signals are present at the receiver. Place
the two microphone elements as closely together
as possible, and place them where there is a steady
source of sound. Pink noise from a loudspeaker,
headphone, or smartphone is ideal. Make sure it is
loud enough to modulate the receiver audio to the
middle of the range on both channels.
2. Connect a headphone amplifier to one of the audio
outputs on the DCR822 (in Frequency Diversity
mode, the resulting blended audio is mirrored on
Rio Rancho, NM
The DCR822 allows null
testing with a special calibra-
tion mode as shown on the
display. When the display
shows "calibrate," it should be
possible to achieve a null.
Calibration is automatically
activated on selection of the
Dual Channel Digital Receiver
both outputs). In the photograph, an MTCR is used.
Plug a set of headphones into the amplifier jack to
monitor the blended output.
3. In the "Calibrate" mode, the two receiver channels
are placed out of polarity from each other. While
listening to the blended output, adjust the gain
control on one of the transmitters so that the audio
level drops significantly (nulls) as the two channels
cancel each other. For the best performance in
Frequency Diversity mode, adjust the mic gain up
and down on one transmitter as described, listening
for the deepest null.
4. Once completed, Press the PWR/BACK button to
exit this screen, which will automatically change
from from "Calibrate" to "Operate". While still on the
Diversity selection page, you can select "Calibrate"
with the MENU/SEL button, then change to "Oper-
ate" by pressing the UP or DOWN buttons.
Pilot Bypass:
Allows the user to bypass the pilot tone on each chan-
nel while in a Hybrid compat mode and defeats the pilot
tone squelch when on (no pilot tone is required). "Off"
means that pilot tone must be present to allow audio
output. This setting is compatibility mode dependent. If
this option is not available for the mode you have cho-
sen, the screen will show N/A.
WARNING: Without a carrier present (a
transmitter on), the audio will be unsquelched
noise.

Audio Setup

Audio Level:
Allows user to set Audio Output Level per channel and
allows user to enable 1kHz audio tone for level setting.
This setting is Output Type dependent. If AES is cho-
sen, there are no adjustments available.
Output Type:
Allows user to choose output for each channel, analog
or AES3
Routing:
Allows user to choose where to send RX1 and RX2, to
either audio output channel or both.
Smart NR:
Allows user to enable Smart Noise Reduction on either
receiver channel or both. Settings are: Off, Normal and
Full. The default setting for digital compatibility modes is
"Off." The default setting for hybrid modes is "Normal."
Talkback:
Allows user to enable the Talkback (TB) function on
either receiver channels or both, to determine where
the TB outputs are routed, and to select how the TB
signals interact with the normal program audio on those
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