FMUser FU-25A User manual

FMUSER INTERNATIONAL GROUP INC Support: http:// fmusersupport.com
1/ 18
User Manual For
FU-25A 25W FM Transmitter

FMUSER INTERNATIONAL GROUP INC. Forum: http://bbs.fmuser.com
2/ 18
Contents
1. Overview....................................................................................................................................................................3
1.1 Overiew......................................................................................................................................................................3
2. Applications .................................................................................................................................................................3
3. Key Features ...............................................................................................................................................................4
4. Technical Specifications .............................................................................................................................................4
5 Appearance...............................................................................................................................................................6
6 Quick Guide for Connecting part..............................................................................................................................7
7 Key Functions and Operation ......................................................................................................................................7
7.1 Button.........................................................................................................................................................................7
8 User Must Know......................................................................................................................................................12
8.1 Precautions of Transmitter .....................................................................................................................................12
8.2 About Transmission Distance.................................................................................................................................12
8.3 About sound quality ................................................................................................................................................12
8.4 Interference .............................................................................................................................................................13
9 Recommended Applications...................................................................................................................................14
11 Troubleshooting........................................................................................................................................................15
12 Get Help ( http://bbs.fmuser.com ).........................................................................................................................17
13 How to get more streaming broadcast technical knowledge?..............................................................................17

FMUSER INTERNATIONAL GROUP INC Support: http:// fmusersupport.com
3/ 18
1. Overview
1.1Overiew
FU-25Ais a multi-functional FM transmitter. It has stable structure, excellent performance ,
super good sound quality and is very easy to use.
This transmitter uses professional transmitting transistors, it gives excellent audio quality, the
audio port and microphone port are independent from each other, the input signal will be
processed independently too, this decrease the loss of sound quality in a large extent.
2. Applications
-- Car theater
-- For home theater audio playback
--For Church preaching recited scriptures
--For Campus Broadcasting
-- For beach and farm music
--For Festival party

FMUSER INTERNATIONAL GROUP INC. Forum: http://bbs.fmuser.com
4/ 18
3. Key Feature
-Stereo/Mono optional
- RF output power is continuously 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. Technical Specifications
NO
Item
Specification
1
Working Voltage
12V
2
Working Current
﹤5A
3
Frequency Range
87~108MHz
4
Frequency Stability
±10PPM
5
Frequency Stepping
100KHz
6
Environment
temperature
-10℃~45℃
7
Output Impedance
50Ω
8
RF output power
0W~25W
9
Harmonic, clutter
≤－60dB

FMUSER INTERNATIONAL GROUP INC Support: http:// fmusersupport.com
5/ 18
radiation
10
Audio distortion
0.2%
11
Frequency Response
50Hz~15000Hz
12
Separation
≥35 dB
13
Input level
≤15 dBV
14
Frequency Modulation
±75KHZ
15
SNR
≥70dB
16
Size
210 ㎜（L）*174 ㎜（W）*59
㎜（H）
（Exclude projected parts）
17
Net Weight
About 1.5kg

FMUSER INTERNATIONAL GROUP INC. Forum: http://bbs.fmuser.com
6/ 18
5. Appearance
5.1 Front Panel:
5.2 Rear Panel:

FMUSER INTERNATIONAL GROUP INC Support: http:// fmusersupport.com
7/ 18
6. Quick Guide for Connecting part
1. Please connect the antenna to the transmitter first when you start to use it.
2. Connect your audio (RCA, MIC) to the transmitter.
3. To connect the power adapter.
4. Long press until the screen lighted.
5. Set the transmitter audio input to your audio source input.
6. To set your frequency.
7. To turn the same frequency in your radio ,then you can hear the audio.
7. Key Functions and Operation
7.1 Button
1) Knob description
Action
Definition
Description
Turn
left/rig
ht
Adjust,
shift
Main page, adjusting page, shift
（turn clockwise to increase, turn
Counterclockwise to reduce）
Short
press
Confirm
Enter/Exit Menu page
Press
and
hold
Confirm
On Main page, press and hold to
enter Menu

FMUSER INTERNATIONAL GROUP INC. Forum: http://bbs.fmuser.com
8/ 18
3) Operation Instruction
a) Turn ON
Check the antenna first, make sure it’s well connected. Then connect the power
cord to home socket, press the power button to I position to turn ON the
transmitter.
O position means OFF. See picture on the right.
After power on, the transmitter goes into working status.
Real-time working frequency：
Real-time internal working temperature：
RF output power：
SWR：
Sound Mode：means Stereo，means Mono
Line-in Volume：, the range is 0~79
Microphone Volume：, the range is 0~79
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 the screen.

FMUSER INTERNATIONAL GROUP INC Support: http:// fmusersupport.com
9/ 18
Frequency setting
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 stepping
of 0.1MHz, then press the knob to confirm setting and exit.
Line-in Volume setting
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
confirm setting and exit.

FMUSER INTERNATIONAL GROUP INC. Forum: http://bbs.fmuser.com
10 / 18
MIC volume setting
On the Menu page, turn theknob to page3 MIC VOLUME setting, press theknob to enter setting.
Turn theknob to adjust themicrophonevolume within the range of 0~79, then press the knob
to confirm setting and exit.
RF output power setting
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
confirm setting and exit.
Sound 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
confirm setting and exit.

FMUSER INTERNATIONAL GROUP INC Support: http:// fmusersupport.com
11 / 18
Temperature Protection Setting
On the Menu page, turn the knob to page 6 TEMP setting, press the knob to enter setting. Turn
the knob to adjust the protection temperature point within the range of 30~80℃, then press
the knob to confirm setting and exit.
SWR protection setting
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
knob to confirm setting and exit.
Line 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 to confirm setting and exit.
Exit setting
On the Menu page, turn the knob to page 9 MENU EXIT, press the knob to exit setting and
return to main page.

FMUSER INTERNATIONAL GROUP INC. Forum: http://bbs.fmuser.com
12 / 18
8. User Must Know
8.1 Precautions of Transmitter
> Please connect the antenna to transmitter first, then turn on the power and do other
operations afterwards.
> The working voltage of the transmitter need to connect the 12V adapter , otherwise the
transmitter could be damaged if the voltage is incorrect .
8.2 About Transmission Distance
>Transmission range is greatly affected by the local RF environment, antenna type, power
setting, frequency setting and receiver sensitivity. If the transmission range is short, you may
need to upgrade the antenna to higher gain, or install the antenna on places at higher
altitude.
>Generally speaking, a antenna brings up a transmission distance of around
2-5KM .Please contact us for more and better transmission proposals.
8.3 About sound quality
>Please keep line-in volume under 50% and adjusted to a proper level when inputting into
machine.
>If the input audio sources (such as audio from computer) include bass enhancement mode
or treble enhancement mode, please adjust the volume of transmitter to lower level, because
there is an audio amplifier built-in inside the transmitter, thus the audio output is of high
quality without distortions.
>To ensure better listening experience, please adjust the output volume level of transmitter
to a matching grade with that of other local radio stations.

FMUSER INTERNATIONAL GROUP INC Support: http:// fmusersupport.com
13 / 18
8.4 Interference
>If you hear buzzes from the transmitter, possible reasons could be from the line-in cable or
microphone, or it could be the power source, audio input device, or antenna. The last and
least possible reason is on the transmitter. Please check from the following aspects to solve
this problem:
> Sort out all the cables on the transmitter to make sure they are not intertwined with each
other. The antenna should not be blocked by any object.
> If the buzzes still exist, please pull out the line-in cable and Microphone wire, leave only
the antenna and power source to be connected with the transmitter, then check if the buzz
still exists.
> If the buzzes stop after step 2, the possible reason could be the quality of the line-in cable,
or the line-in cable was intertwined with the power cord, or the audio input equipment caused
the buzz. In this case, keep the wires apart from each other should solve the problem. We
have met similar circumstances from our customers and we suggested the same way to
solve the problem.
> Or you can check the audio input device, it has been testified that if the audio input
equipment is connected with a power adapter, it will cause the buzz on transmitter.
> Another possible reason for the buzz could be on the antenna, it should be 90 degrees
vertical with tightened onto the transmitter.
> If all checks were done as above and the buzzes are still there, the only reason should be
on the power adapter of transmitter.

FMUSER INTERNATIONAL GROUP INC. Forum: http://bbs.fmuser.com
14 / 18
9. Recommended Applications
Applications
Cover Distance
Qty.of Listeners
Suggested transmitter
Small city
10 -15 KM
FSN-1000
1KW FM transmitter
Small village
5 -10 KM
FSN-600
600W FM Transmitter
Big community
3 x 5 KM
FSN-350
350w FM transmitter
Big Conference Room
200 x 500 M
1000-1500
people
FU- 25A 25W FM transmitter
FU-30B 30W FM transmitter
FU-50B 50W FM transmitter
Middle-sized
Conference Room
50 x150 M
50-500 people
FU- 25A 25W FM transmitter
Small Conference Room
50 x 50
Less than 50
people
FU-15A 15W FM transmitter
Public Speech
on Square
500x1000
1000-1500
people
FU- 25A 25W FM transmitter
FU-30B 30W FM transmitter
FU-50B 50W FM transmitter
Simultaneous
Translation
50 x 150 M
FU- 25A 25W FM transmitter
FU-30B 30W FM transmitter
FU-50B 50W FM transmitter
School Classroom
10 x 20 M
Less than 50
people
FU-X01 1W FM transmitter
FU-T300 0.2W FM transmitter
Driving School Teaching
200 x 500 M
100 cars
FU -25A 25W FM transmitter
Car MP3 Audio
Transmission
FU-T300 0.2W FM transmitter
Home Wireless Audio
System
FU-X01 1W FM transmitter
Travel Guide
50 x50 M
FU-T300 0.2W FM transmitter
Outdoor activities
50 x 50 Me
FU-T300 0.2W FM transmitter

FMUSER INTERNATIONAL GROUP INC Support: http:// fmusersupport.com
15 / 18
10. Troubleshooting
NO
Problem
description
Possible Reasons
1
Unable to Power ON
1）Socket is not connected with electricity
2）Power cord is not well plugged.
3）The fuse is not working properly in socket.
2
SWR Alarm
1）Antenna is not well connected.
2）SWR value is too high because antenna doesn’t match
transmitter
3) There are too many reflecting objects close to antenna.
3
Temperature Alarm
1）Fan is not working；
2）Antenna doesn't match transmitter, the SWR value is too
high, thus temperature rises up.
3）The fan holes are jammed.
4
SWR value is too
high
1）Antenna not well connected.
2）SWR value is too high because antenna doesn’t match
transmitter
3) There are too many reflecting objects close to antenna.
5
Short transmitting
distance
1）High loss of feeder cable.
2）Poor broadcasting environment.
3）Output power is low.
4）Antenna is not placed high enough.

FMUSER INTERNATIONAL GROUP INC. Forum: http://bbs.fmuser.com
16 / 18
5）Antenna and transmitter doesn’t match.
6）Radio receiver has low sensitivity.
6
No power output
1) RF output power needs to be adjust higher
2) Transmitter is powered OFF.
7
No audio output
1）Transmitter line-in volume is too low.
2）Line-in audio signal is abnormal.
8
No microphone
output
1）Microphone is not working well.
2）Microphone volume is too low.
3）Microphone is dynamic type.
4）Microphone is not well plugged.
9
Poor sound quality
1）Microphone quality is low.
2）Audio source quality is low.
3）Antenna is not well assembled and connected.
4）Audio signal or transmitter line-in volume is not adjusted
well.

FMUSER INTERNATIONAL GROUP INC Support: http:// fmusersupport.com
17 / 18
11. Get Help ( http://bbs.fmuser.com )
All FMUSER products are equipped with 10 years technical support. If you have any questions
related to our products, please visit http://fmusersupport.com Our engineer will reply you
quickly.
How to get help fast?
In order to save time and get better understanding of the problems, please provide the
information as below, this will help us to get a solution faster.
a. The full page Screenshots of status
b. The full page Screenshots of media
c. The full page Screenshots of access
d. What is the problem
12. How to get more streaming broadcast technical
knowledge?
Go to http://bbs.fmuser.com, you will get more information like this:
How to set the HDMI encoder Resolution Video Bitrate when you streaming?
http://bbs.fmuser.com/t/261
That is all, enjoy your Radio Station and share it to the world.
Jimmy
Update：2020-06-18 15:51:55

FMUSER INTERNATIONAL GROUP INC. Forum: http://bbs.fmuser.com
18 / 18
Let's make it easy to do Broadcasting.
TV@FMUSER