FMUser CZH618F-1000C User manual

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 1
CZH618F-1000C
1KW Di ital FM Broadcast
Transmitter
User’s Manual

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 2
Please notice this:
1. Read safety notice first.
2. A 50Ω dummy load (power rating 1KW) or antenna and cable
(VSWR≤1.30) must be connected before turning power on.
3. Please read System Control Logic section to fully understand how
the system works.
4. Please read the Power On Sequence.

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 3
Catalogue
Safety Notice
1. Overview------------------------------------------------------------------------------------------------------5
2. Technical Specifications------------------------------------------------------------------------------------6
3. System Structure and Function --------------------------------------------------------------------------7
4. Testing Equipment------------------------------------------------------------------------------------------9
5. Test and Maintenance--------------------------------------------------------------------------------------9
6. Panel Function Description ------------------------------------------------- ---------------------------10
7. Power on Sequence----------------------------------------------------------------------------------------13
8. System Control Logic-------------------------------------------------------------------------------------13
9. Description for software use-----------------------------------------------------------------------------14
10. Indicator light --------------------------------------------------------------------------------------------20
11. Failures Check -------------------------------------------------------------------------------------------21

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 4
Safety Notice
1. Please read the followin safety points, in order to avoid the accidents and prevent the
connectin machines to be broken.
2. Only the qualified maintenance workers can operate the service.
3. Prevent the fire and the bodily injury.
a. Use the proper wire. If not, it will cause the fire and the bodily injury;
b. Ensure the machine connect the round. Please confirm whether the machine has connected
the round, throu h the wire and the lead, to prevent the electric shock;
c. Use the proper fuse. Please use the stipulated type and ratin fuse;
d. Provide ood ventilation. This machine adopts the natural convective radiation. Fix it
correctly to keep it radiatin well.
4. Please don’t disassemble and repair by yourself when it’s broken down. Please send to the
professional service department to solve the problems.
CAUTION：Please don’t assemble the machine in the moist environment;
Please don’t assemble the machine in the easy explodin environment;
Please don’t repair by yourself.
5 If you have any other questions, please connect with us throu h [e-mail]

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 5
1. Overview
CZH618 di ital FM broadcast transmitter, combinin with audio modulation and 1KW power
amplifier, is an excellent di ital product that owns the hi hest and newest technolo y.
The whole machine adopts the latest di ital si nal processin and the direct di ital
synthesized technolo y. This advanta e provides us with excellent hearin feature which can
match to CD audio quality.
CZH618 di ital FM broadcast transmitter runs with perfect performance. Its technical
specifications like THD; Audio Frequency Response; SNR and Stereo Separation etc. totally meet
the national relevant standards and industry standards of FM transmitter. At the same time as the
brand new hi h-tech di ital products, in a number of their technical specifications is much hi her
than the national standards and industry standards.
CZH618 di ital FM broadcast transmitter is composed of five parts: Power Supply, Main
Control and Display Cell, Audio Processin and Frequency Synthesizin Cell, Power Control
Center, and Power Amplifier Cell. It is fitted in the 3U, 19 inches standard case. All the output and
input si nal is lead from the back panel.
240 *64 liquid crystal as a display unit, displayed pa e is clear.
CZH618 series has password protected function to protect some important parameters from
accidentally or incidentally chan in .
CZH618 di ital FM broadcast transmitter provides a serial communication interface, in order
to build a Remote System easily.
CZH618 exciter has analo and AES/EBU audio interface and SCA interface(only two types
are chose in three ).AUDIO INPUT LEVEL -12dBm to +8dBm,Analo audio input impedance
600Ω，AES/EBU Di ital audio input impedence110Ω。
RTC function with which transmitter can be power on/off on time are optional.

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 6
2. Technical Specifications
Electrical Specification
 RF Frequency 87.00MHz～108.00MHz Step 10kHz
 Output Power Continuous adjustable to settin power
 Power Accuracy <±10%
 Power stability <±3%
 Output Impedance 50Ω
 RF Output connector 7/16” DIN or 7/8” EIA
 SFDR <-70dB
 Residual Amplitude Modulation ＜-50dB
 Carrier Frequency accuracy ±200Hz
 Frequency Stability: 1x10
-6
 Modulation Deviation 0~120KHz (100% ±75kHz)
 Pilot Frequency 19kHz±0.1Hz
 Pilot Amplitude 0~12KHz (10% 7.5K)
 Analo Audio Input Impedance 600Ω Balance
 Audio Input Level -12dBm～+8dBm, Step 0.1dBm
 Di ital Audio Input Impedance 110Ω Balance (optional)
 Di ital Audio Input Level 0.2～10Vpp (optional)
 Di ital Audio Sample Rate 30kHz～96kHz (optional)
 Audio ain -15dB~+15dB step 0.1dB
 Pre-emphasis 0µs、50µs、75µs
 LR Channel Level Difference ＜0.1dB（100% Modulation）
 Frequency Response ＜±0.1dB , 30Hz～15000Hz
 THD ＜0.1%, 30Hz～15000Hz
 Stereo Separation ＞50dB（type.）, 30Hz～15000Hz
 SNR ＞70dB(type.) , 1kHz 100% Modulation
 Power Supply AC180V~AC260 47Hz~63Hz
 Heat dissipation Forced ventilation

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 7
Physical Specification
 Casin Size 3U（484mm×88mm×600mm）、19Inch
 Wei ht 25±0.2k
 Ambient temperature 5℃～+40℃
 Relative Humidity ＜95%
 Sea Level Hei ht ＜4500m
3. System Structure and Function
CZH618F-1000C di ital FM broadcast transmitter is composed of five parts: Power Supply,
Main Control and Display Cell, Audio Processin and Frequency Synthesizin Cell, Power
Control Center, and Power Amplifier Cell (it is showed by Fi ure 3-1 ).
The Power Supply chan es the 220V AC to all kinds of DC for other parts of transmitter.
Main Control and Display Cell is an interface between users and the machine. It puts all
information about transmitter on the LCD, and users can confi ure the transmitter via pressin the
key buttons.
Audio Processin and Frequency Synthesizin Cell is the core of the transmitter, This part
does pilot stereo code, pre-emphasis, and audio ain for inputtin audio si nal which can be analo
or AES or SCA by usin di ital si nal process technolo y, and meanwhile, it usin direct di ital
synthesis technolo y to et frequency which users want.
Power Amplifier Cell contains Driver, Power Distribute, Amplifier, Power Combiner, Filter,
Power Monitor.
Power Control Center Controls output RF power at a value form Main Control and Display
Cell, accordin as samplin value of power, volta e, current, temperature. At the same time, it
sends samplin value to Main Control and Display Cell to display.

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 8
ADC
AES/EBU
Di ital Si nal
Processin (DSP)
（ Di ital Filter, Stereo
code, Di ital
Pre-emphasis
Audio Gain
）
direct di ital synthesis
（ DDS ）
Band-pass Filter
Driver
Power
Amplifier
Filter
Power Supply
Micro Process
（
MCU
）
LCD
Display
Com
Interface
SCA
Analo L
Input R
Di ital
Input
SCA
Input
Fi ure 3-1 CZH618F-1000C transmitter
structure and function
Power Monitor
RF
Output
Key
Buttons
Power Filter,
Sample,
Power Control
220V AC
Input

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 9
4. Testing Equipment
Name Type Specification Manufacturer
Universal Counter 53132A 225MHz，12 words
A ilent
Spectrum Analyzer 8560E 30Hz～2.9GHz HP
Di ital Oscilloscope TDS2024 200MHz Tektronix
FM Demodulation FMAB 100KHz~5.6GHz RS
Stereo Decoder FMAB 100KHz~5.6GHz RS
Audio Analyzer P1DD Analo and di ital Audio Precision
Wattmeter MODEL 43 0～1KW Bird
Table 4-1 Test instrument for CZH618F-1000C transmitter
5. Test and Maintenance
CZH618F-1000C Di ital FM Transmitter is a hi h performance Transmitter, its Technical
Specifications are complete meet FM Transmitter’s National Standard & Industry Standard, and as
a new type of hi h-tech Di ital Product, a lot of its Technical Specifications are better than
National Standard & Industry Standard.
5.1 Performance Test
CZH618F-1000C Di ital FM Transmitter is the Compact product. So it only needs One-Time
Testin of the Entire Machine, if the testin report doesn’t meet its technical specifications by the
same accuracy instrument, please repair it in professional department or ori inal manufacturer.

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 10
5.1.1 Audio Performance Test
a. Connect transmitter and test Instrument with cable accordin Fi ure 5-1.
b. Make audio analyzer output 400Hz, 0dBm;
c. Finely adjust audio output level until demodulation reaches 75KHz (100% modulated）;
d. Scan audio output frequency from 30Hz to 15kHz, record frequency response (< ±0.1dB)
and distortion (< 0.1%);
e. Scan audio output frequency from 30Hz to 15kHz, record stereo separation (typical >
50dB);
f. Set audio analyzer to 1kHz, exciter pre-emphasis to 50µs, demodulator to 50µs de-emphasis,
adjust audio analyzer power output until demodulation reaches 75KHz , record mono SNR(>75dB)
and stereo SNR (>70dB).
5.1.2 Carrier Frequency Accuracy Test
a. Connect the test instrument to transmitter accordin to Fi ure 5-2;
b. The test carrier frequency accuracy (±200Hz).
Transmitter
Wattmeter
Dummy
Load
Universal
Counter
Attenuator
Fi ure 5-2 connectin for carrier frequency test
Fi ure 5-1 connectin for audio analyse
Audio
Analyzer
FM
Demodulation
Transmitter Wattmeter
Dummy
Load
RF RF
RF
Audio
Audio