Using Diversity Modes - Lectrosonics DCR822 Instruction Manual

DCR822
• Four tuning groups are available, U, V, W, X, with
each containing up to 32 frequencies that can be
naed. Additionally, Compat Mode can be now cho-
sen per frequency.
• Each group has the option to add or delete a
frequency from the list. Use the UP and DOWN
arrows to move through the options, MENU/SEL
to choose the field to change and the UP/DOWN
arrows to move up or down by number. Push the
PWR/BACK button to return to the Frequency
Screen.
• Each group can store up to 32 frequencies to the
microSD card.
• The user can also send or get all frequency groups
(through the IR & Sync screen).
To add or remove frequencies from a tuning group, see
Group Edit below.
Scan:
Scans for an open frequency and shows a graphic
representation of RF energy in the area, by frequency.
Press MENU/SEL to begin the scan. You can pause the
scan by pressing MENU/SEL a second time. Pressing
MENU/SEL again changes receiver channels.
Scan Zoom:
To zoom the screen, first pause the screen. Press the
UP+DOWN buttons to see another scan. Pressing
MENU/SEL clears changes. To exit the zoomed view,
press UP+DOWN again to return to the previous screen.
Clear Scan:
S c a n Z o o m e d
Clears scan results. Highlight
CLEAR SCAN in the menu, then
press MENU/SEL. The screen will
quickly show Scan Data Cleared.
5 2 5 . 1 0 0
Group Edit:
Allows the user to add, and delete frequencies within the
available tuning groups. Use the MENU/SEL button to
move the cursor between the group selector and the list
of frequencies within that group (if any). With the cursor
on the Group selector, use the UP or DOWN arrow but-
tons to select from the four available groups: u, v, w and
x. Once the desired group has been selected, Press the
MENU/SEL button together with the UP button to add
a new frequency to the group. The cursor will highlight
MHz. Use the UP or DOWN buttons to change the value.
Press the MENU/SEL button to move the cursor to
the kHz value. Use the UP or DOWN arrows to change
the value. When finished, press the MENU/SEL button
again, and "Go" will appear at the bottom right. Press the
DOWN button to complete the operation. To add ad-
ditional frequencies to the group, follow the same steps
above again. To delete frequencies from the group, press
MENU/SEL to move the cursor to the first frequency in
the list. Then, use the UP or DOWN buttons to select
14
the frequency you wish to remove. Press the MENU/SEL
and DOWN buttons together to delete that frequency
from the list.
To load or save groups to the microSD card, see the sec-
tion on SD Card Settings. To share groups via IR sync,
see the section on IR & Keys.
When adding frequencies that may exist in more than
one block (470/19, 23 or 24 and block 606), a prompt will
appea for the applicable block, which then becomes se-
lectable. The purpose of this is to ensure that the correct
pilot tone is used, when in a Digital Hybrid compatibility
mode (NA Hyb, EU Hyb, NU Hyb, JA Hyb). The exact
ranges of the overlapping regions are:
· 606.000 to 613.375 MHz: block 23 and block 606
· 614.400 to 631.575 MHz: block 24 and block 606
· 486.400 to 495.675 MHz: block 470 and block 19
Diversity:
Choose between: Vector or Frequency. Diversity modes
safeguard against loss of audio signal caused by Mul-
tipath. If you choose Frequency, the system will ask you
to calibrate. The calibration step is necessary for match-
ing audio levels between channels for proper orientation.

Using Diversity Modes

Two diversity reception modes are available:
• Vector Diversity uses one receiver module per
audio channel.
• Frequency Diversity uses two receiver channels
and two transmitters per audio channel. The sec-
ond receiver will automatically be set to the same
Compat Mode as CH1 when this diversity mode is
selected.
Vector Diversity
Vector Diversity works by expressing the signal from
each antenna in angle and magnitude (vector). This
makes it possible to continuously rotate one of the vec-
tors mathematically so the angles match and the sig-
nals can be combined constructively. In this way, all the
energy that is available at both antennas is always fully
contributing to the receiver's performance.
Frequency Diversity
Frequency Diversity differs from vector diversity in that it
uses both receiver channels and two transmitters operat-
ing on different frequencies. The purpose of this mode is
to have redundancy in the system for critical productions,
such as live television, to guard against failures caused
by dead batteries and multipath dropouts.
Frequency Diversity requires that the levels of the two au-
dio channels to be closely matched to avoid audible 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
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