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

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 11
5.1.3 Harmonic Suppression
a．Connect the test instrument to transmitter accordin to Fi ure 5-3;
b．Record harmonic suppression relative to carrier (<-60dB).
5.2 Maintenance
It needs to use new fans instead of the old ones which have worked more than 15000 hours. If
the di ital FM broadcast transmitter works at a very dirty environment, for example a place with
much of dust, it must be to replace fans ahead of schedule.
6. Panel Description
6.1 Front Panel
1—— LED Indicator
ON power supply indicator；
Transmitter
Wattmeter
Dummy
Load
Spectrum
Analyzer
Attenuator
Fi ure 5-3 connectin for spectrum analyzer

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RF. RF power out;
STEREO stereo indicator;
REMOTE remote control is on.
TEMP temperature alarm.
VSWR VSWR is hi h.
GENERAL PA Volta e or PA Current system alarm;
RF MUTE inter-lock in or excessive forward power or
excessive reflect power.
2 —— LCD display screen
3 —— Operation button
UP: up or increase
ENTER: enter
DOWN: down or decrease
ESC: cancel
4—— Power switch
6.2 Back Panel
Back Panel function description:

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USER’S MANUAL FOR CZH618F-1000/500C TRANSMITTER 13
1. AC Socket
PIN1----L；
PIN2----GND
PIN 3----N；
2. Axial Fan for power supply
3. COM RS232
PIN 2----TX
PIN 3----RX；
PIN 5----GND；
4. RF Test Port
5. Fuse Socket with 25A .
6. Left Analo Audio Input
7. Ri ht Analo Audio Input
8. AES/EBU Input (optional)
9. RF Output
10. Axial Fan for Rf power heat sink
7. Power On Sequence
7.1 Open the packa e, check appearance, switch, key button, socket, and interface port on front
and back panels.
7.2 Turn power switch on the “OFF” position and connect power cord to power source.
7.3 Connect RF out port to a 50 Ohm dummy load or antenna throu h a cable.
7.4 Turn power on.
7.5 Set RF lo ical control (see detail in System Lo ic Control).
7.6 Set RF power.
7.7 Set parameters such as frequency, di ital/analo audio input select, stereo/mono select, audio
ain, modulation deviation, pre-emphasis.
7.8 Turn on RF power.

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8. System Control Logic
8.1 RF Output Control
The RF output of CZH618F-1000/500C di ital FM broadcast transmitter is controlled by
switches: RF Switch in main menu and period control switch in RTC menu.
RF Switch:
When RF Switch is off, turn off RF power.
When RF Switch is on and Period Control is disabled, turn RF power on to settin power.
When RF Switch is on and Period Control is enabled, RF power is controlled by Period
Control function (see Period Control).
Period Control:
When RF Switch is on and Period Control is enabled, the control method is as follow:
The system reads current time throu h RTC and check whether current time is fallin into any
of the three periods. If yes; turn on RF power to its settin power. Else turn off RF power. A period
is invalid if start time is reater than or equal to end time. Current time will never fall into an
invalid period. If three periods are all invalid, turn RF power off for ever.
8.2 Remote Control
Remote control is set in <SET> menu. When remote control is enabled, remote LED on front
panel is lit and parameters are controlled by remote host and can not be chan ed locally except
“Remote” fla in <SET> menu. Updated parameters will be automatically stored in EEPROM.
When remote is disabled, remote host can not control over the exciter but locally does.
Updated parameters will be automatically stored in EEPROM.
RS232 or RS485 are used for remote control. Before enablin remote control, baud rate and
device address should be properly set.
8.3 Change RF Frequency
After RF frequency chan ed, RF power will drop to 0 first, and then increase to its settin
power.

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8.4 Time Period Modification
It is su ested that disable Period Control before correctin date and time or chan in
period’s start and end time to avoid instantaneous undesired RF power on and off.
8.5 System Protection
In some ur ent cases such as exceeded forward power, reflect power, current and over
temperature, system will reboot. If it is failed successive 3 times, the system will automatically
turns off RF power and just acts display function.
System will also shut down when some main parameter can not be set such as frequency,
di ital/analo audio select.
9. Direction for Software Use
9.1 General Description
9.1.1 Buttons
UP: Up or increase, when pressed and held for a lon er time, it speeds up.
DOWN: Down or decrease, when pressed and held for a lon er time, it speeds up.
ENTER: Enter, used to select menu and enter edited parameter.
ESC: Cancel; back to last menu
9.1.2 Menu classification
There are three kinds of menus: display menu is display only menu; select menu used to
select sub menu or oes back to its main menu; edit menu used to enter parameters or confi ure
the system.
How to enter parameter
Just scroll hi hli ht bar to desired edit item and press ENTER, use UP or DOWN to chan e
parameter and press ENTER a ain to save it. Some important parameter or operation may need
further confirmation. In this case, a “Y” or “N” will appear after editin at the end of the edit line.
Use UP or DOWN to select “Y” (confirm) or “N” (cancel) and press ENTER to save updated
parameter or cancel it.
Parameter can not be modified locally when remote is enabled except “Remote” itself.

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9.1.3 Return to Main Menu
When there is no operation (press button) for a lon time, system will return to its main menu
automatically with LCD backli ht off. Not saved updated parameter will be replaced with its old
value.
9.1.4 LCD backlight
LCD backli ht will be automatically turned off when there is no operation for a lon time and
turned on immediately when any key is pressed.
9.2 Pages Description
9.2.1 System Boot Up
Durin the system boot up, company lo o is displayed and all LED on front panel blinks 4
times (power LED is on). After system bootin up, it enters to the pa e displayin frequency and
power set.
9.2.2 Setting parameter display
Fi ure 9-2 The Pa e displayin settin parameters
Frequency and Power set percent, the most important settin parameters, appear in this pa e.
after that, when this pa e is disappeared ,the system will slowly increase output power; if users do
not accept these two parameter, it’s should to keep any of the keys in push more than 5 seconds,
then when it enters the main menu pa e, in will not to transmit any power.

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9.2.3 Main menu page
Fi ure 9-3 Main menu pa e
Fi ure 9-3 shows main menu pa e. The audio bar displays at the left of the pa e. The scale
means modulation deviation.
This pa e contains the parameter as followin :
RF SWITCH: RF switch control select between ON or OFF.
FWD POWER: forward power display only.
RFL POWER: reflected power display only.
FREQUENCY: RF frequecncy display only.
AUD GAIN: left and ri ht audio ain display only.
[VIEW] parameter data browse menu, see [VIEW] menu.
[STATUS] system runnin ststus, see[STATUS] menu.
[SET] parameter settin menu, see [STATUS] menu.
9.2.4 Page of VIEW

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Fi ure 9-4 Pa e of VIEW
Fi ure 9-4 shows the all parameters in the VIEW pa e. In the VIEW pa e, users can only
browse the parameters. If users want to modify the parameters, it should to be enter the SET pa e.
FWD POWER： forward power.
RFL POWER: reflected power.
FREQUENCY： RF frequency.
MODU DEV: modulation deviation.
AUD GAIN: audio ain.
AUDIO INPUT: audio input and modulation mode, see [Set] menu.
PRE-EMPHASIS: pre-emphasis.
PILOT DEV: pilot deviation；
AMP VOLTAGE: amplifier volta e (48V in normally).
DRV CURRENT: current of driver amplifier.
AMP CURRENT A: current of amplifier module A.
AMP CURRENT B: current of amplifier module B.
TEMPERATURE: temperature of amplifier
BAUDRATE: baud rate used for serial communication.
ADDRESS: device address used for remote control.
REMOTE: remote control switch.
DATE: date
TIME: time.
PERIOD CTRL: period control.
[EXIT] return to its parent menu.

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9.2.5 Page of STATUS
Fi ure 9-5 Pa e of STATUS
Two pictures in Fi ure 9-5 show the status of all parameters, users can find out the system is
runnin normally or not.
RF OUTPUT: Normal/OFF/Drop; Refer to control lo ic section.
Normal: RF output is in normal status.
OFF: RF power is off.
Drop: RF power can not achieve to its settin power.
SYSTEM: Normal/Error
Indicate system errors. Contact equipment provider when error happens.
FWD POWER: Normal/Warnin /Protect
Normal: forward power is normal.
Warnin : forward power is hi her than settin power.
Protected: forward power is too hi h, RF power is turned off.
RFL POWER: Normal/Warnin /Protect/Protect H
Normal: reflect power is normal.
Warnin : reflect power is hi h, may cause RF power drop.
Protected: reflect power is too hi h, RF power is turned off.
AMP VOLTAGE: Normal/Warnin /Protect
Normal: amplifier volta e is normal.

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Warnin : amplifier volta e is hi h, may cause RF power drop.
Protected: amplifier volta e is too hi h, RF power is turned off.
DRV CURRENT: Normal/Warnin /Protect
Normal: amplifier driver current is normal.
Warnin : amplifier driver current is hi h, may cause RF power drop.
Protected: amplifier driver current is too hi h, RF power is turned off.
AMP CURRENT A: Normal/Warnin /Protect
Normal: amplifier module A current is normal.
Warnin : amplifier module A current is hi h, may cause RF power drop.
Protected: amplifier module A current is too hi h, RF power is turned off.
AMP CURRENT B: Normal/Warnin /Protect
Normal: amplifier module B current is normal.
Warnin : amplifier module B current is hi h, may cause RF power drop.
Protected: amplifier module B current is too hi h, RF power is turned off.
CUR BALANCE: Normal/Warnin /Protect, status of unbalance current between 4 amplifier
modules.
Normal: unbalance current is normal.
Warnin : unbalance current is bi , may cause RF power drop.
Protected: unbalance current is too bi , RF power is turned off.
TEMPERATURE: Normal/Warnin /Protect
Normal: temperature is normal.
Warnin : temperature is hi h, may cause RF power drop.
Protected: temperature is too hi h, RF power is turned off.
[EXIT] return to its parent menu.