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7.11.2
Power Supply
The site receiver is supplied with AC mains power via the IEC connector mounted on the
PCB support bracket. This connector contains fuses, rated at 2A (@220VAC), and a
power filter. The IEC socket is connected under the support bracket to the toroidal
transformer primary. The transformer secondaries provide the following voltages to the
site receiver and have the associated fuses installed.
•
place, the resulting unregulated ±28V DC will light LED's L18 and L19. Used for
pan/tilt motor drive.
•
place the resulting unregulated ±12V DC will light LED's L2 and L3, and the
regulated 5V will light L1. Used to provide power for lens drive, 12V DC camera
power, and to supply the microcontrollers and associated circuits with regulated 5V.
•
Used for AC camera power.
The 24V used to power an AC camera is output from the board at PL2. This supply is
isolated above ground. Alternatively, if a 12V DC camera is used, power is supplied
from PL1.
7.11.3
Communications
The RD378 site receiver communications are controlled by the CC-2000 micro-controller.
This section details the switch and jumper settings needed for the required mode of
communications.
Balanced TWO wire audio
The normal connection to the site receiver is a two-wire type cable that carries AFSK
control information from a RD-315 communications module. For this mode of operation,
the cable is connected into PL4, and LK6 must be in position "2W". In addition, the LK2
must have jumpers to link "A→B" and "C→D" to link the communications processor to
the motor control processor. (Factory default).
FOUR wire audio
In some situations, a 4-wire audio connection may be more suitable. For example, when
an optical fiber AF channel is being used. The receive data is an unbalanced input at
PL3, while the transmit data is via a balanced two-wire at PL4. Audio sing around or
feedback can be avoided using this type of connection. The receive data cable should
not be wired further than a few meters and must be shielded as it is a high impedance
input. LK6 must be in position "4W". In addition, the LK2 must have jumpers to link
"A→B" and "C→D" to link the communications processor to the motor control
processor.
Rev. C
2 × 20V/5A via PL17 and PL18. F1 and F2 are rated at 5A. With the fuses in
2 × 10.5V/2A via PL19 and PL20. F3 and F4 are rated at 2A. With the fuses in
1 × 24V/1A via PL2. F5 is rated at 1A. With the fuse in place LED L20 will light.
CAUTION: The UNBAL-INPUT should not be wired
further than a few meters and must be shielded, as it is a
high impedance input.
7.11-2
HMXMU001018
10/06
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