NEC PCN-1815SSQN/1Cx2, Instruction Manual, Page: 60 / 110

GWP-G22906
3-3 Cooling Section
This transmitter is cooled with coolant fed from an external pump rack. The coolant
which flows into the transmitter is branched to cool the PAs and then cools the resistors for
the combiner and is discharged, combined again into one route, from the transmitter.
For details, refer to the Instruction Manual of liquid cooling system (HO2-344491-2**),
Pump Rack (HO2-344492-2**) in section 6, and Heat Balance in 1, General, of Vol. II.
3-4 Output Section
This section consists of the low pass filter for rejecting the spurious of the outputs of the
power amplifier section.
Fig. 3-7 shows the schematic diagram of this section
Output of PA
LOW PASS
FILTER
Output Antenna
Fig.3-7 Schematic Diagram
Table 3-3 Attenuation characteristic of filter
Filter Size
Attenuation[dB]
500MHz ~ 600MHz ~ 700MHz ~
NAX-77D
15 25 30
NAX-39D
3 - 7