12/20/11 888-2595-001 1-5
WARNING: Disconnect primary power prior to servicing.
Section 1 Introduction
ZX Series
FLX-11 = single FM output
FLX-12 = dual FM outputs
HDPL-21 = single tri-mode output (FM, FM+HD, HD)
HDPL-22 = dual tri-mode outputs
1.5 Tri-mode Operation
All ZX transmitters are designed to operate in any one of three different modes:
1. FM mode = traditional FM modulation
2. FM+HD mode = hybrid mode with analog and digital HD Radio simulcast
3. HD mode = digital HD Radio modulation only
The determination of operating mode is made by the exciter. To transmit a digital HD
Radio signal, an HD Radio exciter, such as the FlexStar HDX exciter is required. The
ZX amplifier can switch on-the-fly between all three operating modes, as commanded
by the exciter through an exciter interface cable.
1.6 ZX Transmitter General Construction
The ZX transmitter features all solid-state construction and utilizes a series of FET-
based power amplifier (PA) modules to amplify the RF signal. In addition to RF drive
power from the exciter, these PA modules utilize 50V DC power supplied by
switchmode power supply (PS) modules. Both the PA and PS modules are hot-
pluggable and may be inserted and removed from the transmitter while it is on the air.
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