888-2408-002 1-3
WARNING: Disconnect primary power prior to servicing.
Introduction/Specifications
1.3 General Description
The Harris Platinum Z is a series of highly-functional, cost-effective FM radio
transmitters designed using a concept called Z-Axis 3-dimensional electronic
design. The Z5CD and Z5FM are 5kW versions of the Platinum Z FM transmitter.
The Z5CD (Clearly Digital) utilizes the Harris DigitCD, Digital FM exciter, while
the Z5FM would designate an analog exciter such as the Harris SuperCiter is being
used.
The Z-axis approach arranges the system RF components such as dividers,
combiners and amplifiers in three dimensions, to permit the most efficient possible
signal paths between them. The method allows the transmitter amplifying group to
be broken down economically into the smallest possible blocks for removal,
servicing and replacement. See Figure 4-1 on page 4-2 for overall block diagram.
1.3.1 Harris DIGIT Digital FM Exciter
The Harris DIGIT FM exciter is supplied as standard equipment with all Platinum Z
transmitters. The DIGIT, with its digital input module, generates the complete
stereo FM waveform in the digital domain, using a digital signal processor (DSP) as
a stereo generator and composite limiter, and a 32-bit numerically controlled
oscillator (NCO) as a digital modulator. Digital techniques allow direct connection
of standard AES/EBU stereo audio data to the FM exciter to eliminate the distortion
and alignment problems of analog signal paths and analog FM exciters. DIGIT is
also available with an analog interface module for stations with analog program
paths, easily interchangeable with the digital module.
1.3.2 Harris SuperCiter Analog Exciter
The optional Harris SuperCiter is a 55 watt, high quality, analog exciter designed
for broadcasters needing state-of-the-art analog performance at a value price. The
SuperCiter combines time-proven PLL technology with modern RF amplifier
circuits to provide driving power of very high quality to any FM transmitter.
1.3.3 Redundant Exciters
Each transmitter includes one exciter in a basic version but allows space for a
second optional exciter with the needed exciter exchange autoswitching hardware
and control already within the cabinet.
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