4-4
888-2595-001
12/20/11
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
ZX Series
NOTE:
This recommendation does not apply to PA modules with the same 10-digit part
number but a different suffix (none, G, or R). These modules may be inter-
changed.
Every other input cable to the output assembly has an extra ninety degree phase shift.
These cables have white identification labels instead of yellow. This phase offset helps
the transmitter absorb reverse power appearing at the output and cancels a similar
ninety degree offset in the splitter drive cables from the IPA. To maintain the correct
phasing and avoid excessive ballast load power, the yellow-labeled splitter and
combiner coax cables must always be connected to the top half of the PA backplanes,
while the white-labeled splitter and combiner coax cables must always be connected to
the bottom half of the PA backplanes.
The output of the RF output assembly is passed outside the transmitter to the station RF
system and antenna via an EIA 1-5/8 flangeless connection. RF samples derived from a
precision coupler section at the final output are passed to rms detectors on the I/O filter
board to drive the internal forward and reverse power meter. An additional RF sample
is passed to the user interface subpanel at the transmitter rear for customer use. This
monitor sample may be used to drive monitoring equipment and/or the Harris RTAC
adaptive correction system for HD Radio. The coupling value of the monitor port is
listed on the transmitter rear panel and the coupler directivity is typically greater than
35dB.
4.4
AC-DC Interconnect Wiring Diagram
Consult appropriate drawing based on amplifier chassis type:
ZX5000 = 839-8464-081
ZX3750 = 839-8464-083
ZX2500 = 839-8464-085
Each amplifier chassis has three separate AC input connections. Each connection may
assigned to a different phase for three phase operation or bridged together for single
phase operation. Each AC input features either a IEC C20 inlet (ZX2500, ZX3750) or
PowerCon NAC3MPA (ZX5000) connection depending on transmitter model. The use
of NAC3MPA connectors for the ZX5000 module is required to meet the higher current
demands of this chassis in accordance with CE area regulations.
The AC mains power entering the chassis passes through line filters, either integrated
into the mains inlet (ZX2500 and ZX3750) or installed as separate assemblies located
on the underside of the roof of the amplifier chassis (ZX5000).
Summary of Contents for ZX2500
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Page 6: ...MRH 2 888 2595 001 12 20 11 WARNING Disconnect primary power prior to servicing...
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