Tait TB7100, Руководство по эксплуатации

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22 Using the CTU with a TB8100 TBA0STU/TBA0STP CTU Operation Manual
© Tait Electronics Limited September 2005
IOIOI
This is an RS-232 serial port. Connect it to a PC running the Service Kit
or Calibration Kit software when calibrating or tuning the base station. You
must also connect a system control bus cable between the CTU (via
connector
2#
) and the reciter for this interface to work.
POWER
The POWER LED is lit when the CTU is powered up. You can supply
power to the CTU in the following ways (see
Figure 4.3 on page 26 ):
■
connect power directly using the DC input socket
2@
■
let the reciter provide power over the system control bus connector
2#
■
let the reciter’s system interface provide power over the system interface
connector
1!
. This requires that you connect power to the reciter’s
auxiliary DC input connector adjacent to the system interface.
You can safely connect power to two or more of these connectors at the
same time.
Note
You do not need to provide power to the CTU at all in order to
make audio level measurements or to use the digital inputs and
outputs. Lack of power will not affect these interfaces.
Important
Do not power the CTU from a PMU fitted with a 48V
auxiliary power supply board. The maximum supply volt-
age for the CTU is 32VDC. Use either a PMU 12VDC or
24VDC auxiliary output, or an external power supply.
Note that the auxiliary output can be supplied to the CTU
via the system interface connector on the reciter if the aux-
iliary DC power cable is fitted, as well as via a direct con-
nection to the PMU auxiliary output.
NOISE The CTU’s internal, wide bandwidth noise source is available on this
output. You can connect the NOISE socket to the RF input on the reciter
and use it to tune the receiver’s front end. The adjacent switch turns the
noise on and off. The bandwidth of the noise source is approximately
50MHz to 1 GHz, and the output level is approximately –130dBm/Hz.
This output level is equivalent to – 91 dBm typical for a narrow bandwidth
receiver, – 89 dBm typical for mid bandwidth, and –88 dBm typical for wide
bandwidth.
LINE INPUT
The CTU makes audio at this input available to the TB8100 transmitter (it
connects LINE INPUT to the balanced line input on the system interface
connectors).
UNBALANCED/OFF/
BALANCED This switch directs either the balanced or unbalanced receiver output audio
to the CTU speaker. When set to “OFF”, no audio is present on the
speaker.
b
c
d
e
f