RFL 9780 RFL Electronics Inc.
April 8, 2003 4-7 (973) 334-3100
4.4 POWER SUPPLY CONSIDERATIONS
There are three standard station battery voltages which can be used to power the 9780 chassis: 48 Vdc,
125 Vdc, or 250 Vdc. Both the 48 V and 125 V requirements are fulfilled with a single, wide-range
supply. The 250 V requirement uses a different chassis power supply. In addition to this, the chassis
can be equipped with single or dual supplies.
A single supply 48 or 125 Vdc system (38 to 150 Vdc) requires:
one 106455-1 48/125 Vdc Single Supply I/O and
one 106535-1 48/125 Vdc Power Supply.
A dual supply 48 or 125 Vdc system (38 to 150 Vdc) requires:
one 106455-3 48/125 Vdc Dual Supply I/O and
two 106535-1 48/125 Vdc Power Supply.
A single supply 250 Vdc system (200 to 300 Vdc) requires:
one 106455-2 250 Vdc Single Supply I/O and
one 106535-2 250 Vdc Power Supply.
A dual supply 250 Vdc system (200 to 300 Vdc) requires:
one 106455-4 250 Vdc Dual Supply I/O and
two 106535-2 250 Vdc Power Supply.
See section 19 for more information on the power supplies and power supply I/Os.
There are other power supply configurations that may be appropriate under certain circumstances. For
example, if more than 10 W of transmit power is required, an external amplifier will be required and the
external amplifier may be able to supply power to the 9780 chassis.
4.5 INPUT AND OUTPUT VOLTAGES
The inputs and outputs of the 9780 (other than the carrier signals) are typically either 48, 125, or 250
Vdc nominal. As with the power supply, both the 48 and 125 Vdc systems utilize the same modules,
while the 250 Vdc I/Os require that a different I/O Module be installed in the chassis. Normally, the
inputs and outputs in a chassis operate at the same nominal voltage (usually the station battery voltage),
however, special applications can be accommodated. The I/O Modules are installed in the rear of the
9780 chassis. A single Module accommodates both 48 and 125 V systems, and a jumper is used to
select the desired configuration. The Module must be removed from the chassis to change the jumper.
See Section 17 for more information. Refer to Section 1, page 5 for input and output, voltage and
current specifications.
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