1-2
888-2621-001
12/5/07
WARNING: Disconnect primary power prior to servicing.
Section I Operator Guide
Z3-48HD+
There are several methods of combining the analog (FM) and digital (HD) RF to create
an IBOC signal - also known as Modulation Format - that may be used in a typical
IBOC system including a backup mode. The four modes of operation are:
FM - Analog RF only; this could be the analog backup mode in the event of a
digital failure.
FM+HD - Analog & digital (at -20dB) RF, also known as Common Combin-
ing.
HD - Digital RF only, used for Separate Combining, such as 10dB combined,
dual-feed and interleaved antenna, and dual antennas.
SLC - Analog & digital (at various ratios) RF, also known as Split-level or
Mid-level Combining.
Transmitter operation can be initiated or terminated as desired by depressing the ON
HI, ON LOW, or OFF push-buttons. All three transmitters will be commanded into the
selected mode when the Z3-48 System Controller switch is depressed.
The System Controllers also provide the necessary RF metering, common external
transmitter interlock and transmitter interface, and combined transmitter remote control
functions. APC function is retained by the individual transmitters and its RF source.
•
System Controller P/N 992-8850-005
•
System Control Board
•
Assembly #
992-8853-001
•
PWB #
843-5293-076
•
Schematic #
839-8118-181
•
Display Board
•
Assembly #
992-8388-005
•
PWB #
843-5215-004
•
Schematic #
839-8025-004
NOTE:
Parts list is in Section II.
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