FMUser CZH-T251 User manual

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CZH-T251 User Manual
1. Attention before use:
1) Make sure the supplied voltage is within the acceptable range.
2) Only professionals can dothe maintenance.
3) Please make sure the antenna has lightening protection.
4) Please don’t touch the antenna when the machine is connected with power supply.
5) Please don’t power on the machine without connecting antenna.
6) Please don't use the transmitter in explosiveenvironment(e.g. gasstation,places with gas or steam)
7) Please don’t use the transmitter in extreme dusty, damp, hot environment.
8) Please use the transmitter under the regulations by local wireless administration institutions.
2. Menu
1) Product features
2) Product configuration
3) Product user guide
4) Product specification
5) Troubleshoot
3. Product Features
CZH-T251 is a multi-functional FM transmitter.It has stable structure,excellent performance ,super good
sound quality and is very easyto use.
*MainFeatures:
-Stereo/Mono optional
- RF output power iscontinuously adjustable from 0~25watt.
-One button controls all functions.
-SWR protection. When antenna is not well connected, the transmitter will turn to
protection mode automatically.
-Temperature protection. When the temperature of transmitter is too high, it will turn to
protection mode automatically.
4. Product configuration
NO NAME DESCRIPTION QTY UNIT
PORT
1 FM transmitter CZH-T251 1 PCS NO
2 ALLUMINUM
ANTENNA 1/4 OR1/2 WAVE 1 SET RF OUT

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3 POWER ADAPTER DC12V/6A 1 SET 12.0V-6.0A
4 AUDIO CABLE 1 TO 2- 3.5mTO RCA 1 PCS LINE IN
5 USER MANUAL ELECTRONIC VERSION 1 PCS NO
5. User Guide
1) Front and Back Panel descriptionFront Panel
Back Panel

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2) Knob description
Action Definition Description
Turn
left/right Adjust, shift Main page, adjusting page, shift （turn
clockwise to increase, turn
Counterclockwiseto reduce）
Shortpress
Confirm Enter/Exit Menu page
Press and
hold Confirm On Mainpage,press and hold to enterMenu
3) OperationInstruction
a) TurnON
Check the antenna first, make sureit’s wellconnected. Then connect thepower cord
to home socket, press the power button toI position to turnON the transmitter.
O positionmeansOFF. See pictureon the right.
Afterpower on, thetransmittergoes into working status.
lReal-time working frequency：
lReal-time internal working temperature：
lRF outputpower：
lSWR：
lSoundMode：meansStereo，means Mono
lLine-in Volume：,the range is 0~79
lMicrophone Volume：, the range is 0~79

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b) Function and Parameter setting
Press the knob to enter Menu page. Turn the knob to shift pages. There are 9 pages altogether rotating on
thescreen.
lFrequencysetting
On the Menu page, turn the knob to page 1 FERQ setting, press the knob to enter
setting(the RF output will be shut down temporarily). Turn the knob to adjust the frequency
by steppingof 0.1MHz, then press theknob toconfirm setting and exit.
lLine-in Volumesetting
On the Menu page, turn the knob to page 2 LINE VOLUME setting, press the knob to
enter setting. Turn the knob to adjust the volume within the range of 0~79, then press the
knob to confirmsetting andexit.

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lMIC volumesetting
On the Menu page, turn the knob to page3MIC VOLUME setting, press the knob toenter
setting. Turn the knob to adjust the microphone volume within the rangeof 0~79, then press
the knobto confirm setting and exit.
lRF outputpowersetting
On the Menu page, turn the knob to page 4 RF POWER setting, press the knob to enter
setting. Turn the knob to adjust the output power within the range of 0~50w, then press the
knob to confirmsetting andexit.
lSound mode setting
On the Menu page, turn the knob to page 5 ST<OR>MO setting, press the knob to enter
setting. Turn the knob to shift the sound mode between Stereo and Mono, then press the
knob to confirmsetting andexit.
lTemperature Protection Setting
On the Menu page,turn the knob to page 6 TEMP setting, press the knobto enter setting.
Turn the knob to adjust the protection temperature point within the range of 30~80℃, then
press the knobtoconfirmsetting andexit.

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lSWR protectionsetting
On the Menu page, turn the knob to page 7 SWR SET setting, press the knob to enter
setting. Turn the knob to adjust the SWR protection point within the range of 1.0~5.0, then
press the knobtoconfirmsetting andexit.
lLine Mute setting
On the Menu page, turn the knob to page 8 MUTE setting, press the knob to enter setting.
Turn the knob to set Mute status, ON means the line-in is muted, OFF means the line-in is
available. Press the knob toconfirm setting and exit.
lExit setting
On the Menu page, turn the knob to page 9 MENU EXIT, press the knob to exit setting
and returntomainpage.
Remark: In the MENU page, if there is no action within 20 seconds, the system will return
to Mainpage automatically.
6. Technical Specification
NO Item Specification
1 WorkingVoltage 12V
2 WorkingCurrent ﹤5A
3 Frequency Range 87~108MHz
4 Frequency Stability ±10PPM

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5 FrequencyStepping 100KHz
6 Environment temperature -10℃~45℃
7 OutputImpedance 50Ω
8 RF outputpower 0W~25W
9 Harmonic,clutter radiation ≤－60dB
10 Audio distortion 0.2%
11 FrequencyResponse 50Hz~15000Hz
12 Separation ≥35 dB
13 Input level ≤15 dBV
14 FrequencyModulation ±75KHZ
15 SNR ≥70dB
16 Size 210 ㎜（L）*174 ㎜（W）*59 ㎜（H）
（Exclude projected parts）
17 Net Weight About 1.5kg
7. Troubleshooting
NO Problemdescription PossibleReasons
1 Unable toPower ON 1）Socket is notconnectedwith electricity
2）Power cordis not well plugged.
3）The fuse isnotworkingproperly in socket.
2 SWR Alarm
1）Antenna is not well connected.
2）SWRvalue istoo highbecause antenna doesn’t
match transmitter
3) There are too many reflecting objects close to
antenna.
3 Temperature Alarm
1）Fan is notworking；
2）Antenna doesn't match transmitter, the SWR
value is too high, thus temperature risesup.
3）The fanholes are jammed.
4 SWR valueis too high
1）Antenna not wellconnected.
2）SWRvalue istoo highbecause antenna doesn’t
match transmitter
3) There are too many reflecting objects close to
antenna.

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5 Short transmitting
distance
1）High loss of feeder cable.
2）Poorbroadcasting environment.
3）Output power is low.
4）Antenna is not placed highenough.
5）Antenna and transmitterdoesn’t match.
6）Radio receiver haslowsensitivity.
6 No poweroutput 1) RF outputpowerneeds to be adjusthigher
2) Transmitteris powered OFF.
7 No audiooutput 1）Transmitterline-in volume istoolow.
2）Line-inaudio signalis abnormal.
8 No microphone output
1）Microphoneis not workingwell.
2）Microphonevolumeis too low.
3）Microphoneis dynamic type.
4）Microphoneis not well plugged.
9 Poor sound quality
1）Microphonequalityis low.
2）Audio source qualityis low.
3）Antenna is not well assembledand connected.
4）Audio signal or transmitter line-in volume is
not adjusted well.