Tait TEL0061 PowerAmpInstall
M850-00
3 T858/859 Installation
3.1 Rack Mounting
RF Output
Top Rail
T858/859 Installation
F3.1
Caution:
If you require continuous operation of the T858, leave the rack module
position immediately adjacent to the finned heatsink empty. There
should be adequate airflow over the fins at all times. Extra airflow can
be provided by fitting an auxiliary fan kit such as the T800-19-0010
(refer to the T800 Ancillary Equipment Service Manual or your nearest
Tait Dealer or Customer Service Organisation for more details).
The T858 and T859 PAs are designed
for use in a standard 483mm rack frame
using Tait T800 Series II guide rails.
The guide rails are securely mounted to
the rack frame with front and rear
Rack Mounting
Holes
retaining screws, and the PA is secured
into the guide with two (T858) or four
(T859) front panel mounting screws.
Figure 3.1 shows the standard, double
width guide designed for use with the
Front Panel
Mounting Holes
Rack Mounting
Holes
T859, while Figure 3.3 shows how the
PA can be latched in the extended position. For more information on available guide kits, refer to the T800
Ancillary Equipment Service Manual
or your nearest Tait Dealer or Customer
Rack Mounting Holes
Service Organisation.
Figure 3.1 T800-45-0001 PA Guide Kit
The PA rear panel has three connectors: a BNC for RF input (from an adjacent T857
exciter), an N-type for RF output and a D-range for all DC, audio and control connections (refer to Figure 3.2).
T858
T859
N-T ype Connector
BNC Connector
D-Range Connector
N-Type Connector
BNC Connector
D-Range Connector
Figure 3.2 T858/859 Chassis Connectors
RF Input
D-range
Bottom Rail
Figure 3.3 T858/859 PA In Latched Position
Note:
You will need appropriate extension leads if you wish to carry out any
adjustment procedures with the PA withdrawn from the rack in the latched
position. Alternatively, disconnect and withdraw the PA and reconnect it
behind the rack.
3.2 Rack Wiring
The D-range input and output connections are shown in Figure 3.4. Ensure that the
cables are not subjected to any stresses due to tight bends or incorrect lengths.
Make sure the RF coax cables to the N-type and BNC connectors are free from sharp
bends or twists. If access to the rear of the rack frame is restricted, the cables should be
long enough to allow the chassis to be fully withdrawn from the guide.
10.8 to 16V DC
Pull low to enable
alarm outputs
Power supply, -ve earth
+13.8V
Tx Key
Gnd
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
Forward Power Alarm
Reverse Power Alarm
Forward Power Metering
Reverse Power Metering
Figure 3.4 T858/859 D-Range Wiring - Rear View
Normally low, float
on alarm conditions.
500mA sink capability.
Will drive a coil meter
Copyright TEL 31/01/99
F3.2
T858/859 Installation
M850-00
3.3 Power Supply
If a power supply other than an appropriate Tait model is used, ensure that it is capable
of providing enough current to drive the T800 system and is also free from excessive
ripple or noise.
The system should be protected by the use of appropriately rated fuses in the power
supply.
Note:
Caution:
It is particularly important when the prime power source is a battery that
fuses be employed in all supply lines.
Connect the power supply directly to the PA, and not via connector
blocks. This will avoid overheating of connector blocks that are not of
the correct current rating.
3.4 Reverse Polarity & Overvolta ge Protection
A crowbar diode is fitted to all T858/859 PAs for protection against connection to a
power supply of incorrect polarity. It also provides overvoltage protection from voltage
transients caused by lightning strikes.
Note:
A fuse must be fitted in the power supply line for the diode to provide effective protection.
29/02/00 Copyright TEL
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