User's Manual Part 1

Table Of Contents
3EM21522AAAA Functiona
l
Description
Issue 1, March 2008 DTR-0200-SA-SIRIUS
2-21
2.5
S-BAND OUTPUT FILTER
The output filter is a bandpass filter and provides attenuation of the out-of-band
emissions generated by the HPA. The attenuation is to comply with the require-
ments of TN-SPEC-2.1.0, Terrestrial Network Technical Specification, Transmitter
RF Emissions.
2.6
OUTPUT COUPLER
The output coupler, connected to the output port of the transmit filter, is the final
component in the transmitter chain. The coupler samples the composite RF power
level at the repeater RF output. The RF levels at the FWD and REF ports are mea-
sured with the RF detectors and reported to the repeater main controller via the
RS485 interface. The output coupler provides test ports for connection to external
test equipment.
2.7
POWER DISTRIBUTION
See
Figure 2 - 12
and
Figure 2 - 13
for a simplified block diagram and an isometric view
of the Power Distribution Unit (PDU). The PDU is mounted on the bottom of the
repeater cabinet (see
Figure 1 - 5
), receives the input commercial 208VAC power, and
distributes required power to the repeater modules.
The PDU is comprised of seven circuit breakers, two surge protectors, two RFI power
line filters
, two latching relays, forty two-stage feed through terminal blocks, and one
double grounding terminal. The front panel of the PDU houses the seven circuit
breakers and one power outlet.
The circuit breakers are as follows:
MAIN POWER – one 32A, 250VAC, 3-pole circuit breaker controls the incoming
208V
AC to the repeater from the commercial source. Throwing this breaker will
remove all power from the repeater.
FANS – one 5A, 250VAC, 2-pole breaker powers the axial fans.
HPA – one 25A, 250VAC, 2-pole breaker supplies the HPA power supply. SPU – one
5A,
250VAC, 2-pole breaker supplies the SPU power supply
EXT HEATER – one 5A, 250VAC, 2-pole breaker powers the external heater
INT HEATER – one 5A, 250VAC, 2-pole breaker powers the internal heater
AUX POWER – one 10A, 250VAC, 2-pole breaker supplies 120VAC, 5A, to the AUX
OUTLET
.