Retekess TR508 User manual
1
CAUTION:
Never operate the transmitter without connecting a suitable antenna
or dummy 50Ohm load to the output otherwise there is a serious
danger of destruction of the output stage of the transmitter.
Copyright of
This manual CopyRight owned by the company, all rights reserved.
The manual without permission of the company, not in any form or
method to copy, transmit, copy, or translated into any language or
computer language.
FCC Information
This device complies with part 15 of the FCC Rules. Operation is
subject to the following two conditions:
(1) this device may not cause harmful interference and
(2) this device must accept any interference received, including
interference that may cause undesired operation.
Operation of this equipment in a residential area is likely to cause
interference in which case the user at his or her own risk and
expense will be required to correct the interference.
Declaration of Conformity, declares that the POD-FM conforms to
the following standards, in accordance with the provisions of the EC
Directive 89/366/EEC: EN 55022 (CISPR 22:1985), Class A. \
Warranty
Warranty that this product will be free from defects in materials and
workmanship for period of time specified on the product packaging.
This limited warranty shall commence from the date of purchase.
Warranty is not transferable and is limited to the original purchaser.
If product is found to be defective then, as your sole remedy and as
the manufacturer's only obligation, we will repair or replace the
product. This warranty shall not apply to products that have been
subjected to abuse, misuse, abnormal electrical or environmental
conditions, normal wear and tear or any condition other than what
can be considered normal use.
Limitation of Liability
The liability of arising from this warranty and sale shall be limited to
a refund of the purchase price. In no event shall be liable for costs of
procurement of substitute products or services, or for any lost profits,
or for any consequential, incidental, direct or indirect damages,
however caused and on any theory of liability, arising from this
warranty and sale. These limitations shall apply not with standing
any failure of essential purpose of any limited remedy.
Contents
Introducing the FM Transmitter
Technical target
Package Contents
About TR508 Products and Services
Hardware Basics
Installation Instruction
Using the FM Transmitter
Adjustment of Radio Frequency Channels
Power On/Off
Important Notice
Troubleshooting
Setting and adjustment of special functions
(Out Power and Freq. set)
Appendix
Introducing the TR508 FM Transmitter
Thank you for purchasing our transmitter. This stereo FM transmitter
can easily built a wonderful FM radio station. And it has a beautiful
aluminum alloy cover.
We presents a brand new 500mW PLL FM Stereo Transmitter for
FM stereo broadcasting, built in LCD display with blue backlight,
Built in micro controller for frequency control and display. Built in FM
stereo transmitter IC with PLL technology, surface-mount tech,
reliable working condition. The transmission frequency is highly
stable, compact design with aluminum enclosure.
2
transmission distance more than 300 meters (In the line of
sight，field, open land). This transmitter is ideal for al stereo
audio broadcasting, MP3, PC, TV, wireless speakers, game device,
etc. The FM Transmitter will not drift between stations because of
our advanced stereo PLL Digital Tuner Technology.
The FM Transmitter use the control panel buttons to control the
frequency that it broadcasts on so if the power is lost and then
restored it will begin broadcasting back on that exact same
frequency. This avoids any need to reset the FM Transmitter back
to the frequency you original y wanted. We use a switch to turn the
transmitter on and off.This allows the transmitter to automatically
turn back if power were to be lost and then restored.
The FM Transmitter is designed to operate non-stop 24/7.
The higher you place the antenna the farther you will transmit.
Complete easy to follow plug & play instructions are included plus
tips on getting the best distance possible.
If you can match a good antenna to the FM transmitter, the effect
will be better. The transmission range depends on many factors.
The true distance is based on the sensitivity of the receiver,
antenna of the receiver, and the building and other obstructions,
which are between the transmitter and receiver. And the distance
will be much more in countryside.
★Only for reference, also the covering distance is
concern with the antenna and environment.
TR508 FM Transmitter, it's owners, and employees accept no
responsibility whatever for any consequences arising from the use
or misuse of unlicensed or unapproved equipment. We suggest
that you check local laws before operating or purchasing
transmitting equipment. Again, it is your responsibility not to break
the law
3
NO. project
1 working voltage 11~13V DC
（Rated voltage 12 v）2 working current <300mA
3 frequency domain 76~108Mhz
4 frequency stability ±10PPM
5 stepped frequency 100KHZ
6 The operating temperature
of the environment -10℃~50℃7 output impedance 50Ω
8 Rf power output range H:500mW (L:100mW)
9 Harmonic and
noise radiation ≤－60dB
10 audio distortion <0.30%
11 frequency response 20HZ~15000HZ
12 Preemphasis delay 50us
13 degree of separation ≥40 dB
14 input level ≤-10 dBV
15 Modulation frequency
deviation ±75KHZ
16 SNR(Signal to Noise Ratio) ≥65 dB
17 Machine Size L:113mm;W:88mm;H:39mm
18 Machine weight 269g
4
Package Contents
• 1xTR508 FM Transmitter
• 1x100~240VPower Supply
• 1x 3.5mm Audio Cable
• 1x Rubber Antenna
Hardware Basics
1 2 3 4 5 6 7
- +VOL
- +VOL
108.00
FM MHz
ST
8
Connect antenna first, then connect the power supply!
ANT
50
DC12V-1A
!
9 10
+
- 1、Audio volume
2、MIC volume
3、3.5mm Jack for Audio Cable input
4、3.5mm Jack for electret microphone (And the computer use
the same microphone) input
5、Power Button (On/Off)
6、"+"Frequency Up Button (To increase the radio frequency)
7、"-"Frequency Down Button (To decrease the radio
frequency)
8、LCD Digital Display for the Radio Frequency
9、Jack for DC 11-13V
10、Antenna socket
5
Installation Instruction
Connect the Antenna to FM Transmitter.
Connect the FM Transmitter to AC Adapter, then plug AC adapter
to power outlet.
* Note: When the Power supply is connected, the “OFF”
signal will be show on LCD Digital Display:
- +VOL
- +VOL
Connect the iPod, MP3 or CD Player to FM Transmitter with the
audio cable.
Using the FM Transmitter
1. Press Power Button to turn on the Digital Transmitter. The LCD
Digital Display shows the
pre-set radio frequency channel (For example, 98.0MHz).
2. Turn on your radio and switch to FM channel, adjust the radio
frequency channel to desired channel. Now the radio will output as
“zzz” sound or radio music now.
3. Then adjust the radio frequency channel of the Digital
Transmitter to the same radio frequency channel of the radio. (For
example, if the radio frequency channel is set to 98.0MHz then the
FM Transmitter should also be set to 98.0MHz).
6
When the radio frequency channel of the Digital Transmitter and the
radio are same, the “zzz” sound will stop. Adjust the volume to
medium level in iPod or audio player, and start playing music. Now
you will hear the music playing from the mp3 or audio player will
output from the radio. Note: If volume level from mp3 or audio
player is high, the music output from the radio will sound
distorted.
5. Adjust the volume in your radio until the satisfactory output is
reached.
6. When interference occurs, the music from radio will not sound clear.
In this case, please switch to different channels by repeating Step 2
and 3 until the music sound quality is clear again.
Adjustment of Radio Frequency Channels
1. Press Power Button to turn on the FM Transmitter
2. Adjust the FM frequency channels: (Radio frequency channels
adjustment range is 76.0MHz~108.0MHz.)
3. Press Frequency Up/Down Button to increase/decrease 0.1MHz
radio frequency channels on the Transmitter.
4. Press and hold the Frequency Up/Down Button to continuously
increase/decrease radio frequency channels on the Digital
Transmitter.
Power On/Off and Power
Press Power Button turn off the FM Transmitter.
Important Notice
• This product should be kept in dry condition and away from water.
• Keep the product off direct sunlight or high temperature environment.
• Please unplug the power plug when it is not in use.
Troubleshooting
1、If the FM Transmitter does not function normally,
• Please check whether all wires/ cables being connected tight and
correct.
• If the product cannot be powered on, check whether the AC adapter
works and connects properly.
2、If music output from the radio is distorted (not clear),
• First, reduce volume from iPod or audio player to medium or lower
volume range, and then turn up volume from radio to desired level.
The music sound quality should improve.
7
• If the pervious method does not improve the music sound quality,
it means the problem may be due to frequency interference. Then
you need to switch to other channel.
3、If the volume output from the radio is too loud when the FM
Transmitter is not being in use,
• When FM Transmitter is in used, desired volume output level from
the radio is typically higher than without using FM Transmitter. To
prevent the volume output too loud when the FM Transmitter is not
being in use, you can decrease the radio volume and increase the
iPod or audio player volume as long as the sound from the radio
remains clear.
4、If music output from the radio have current acoustic interference,
• Try to change the location of the transmitter, or change the
location of the power supply, or change the location of the audio
line. Power supply must be away from the transmitter at work.
Setting and adjustment of special functions
Power adjustment and frequency adjustment
2010 V1.2 version with two level power adjustment: High power
(H):> 500mW; low-power (L): <100mW
Step 1:
First press and hold the power switch " ", and then insert the
power plug to the Power jack " ".
Step 2:
Release the power switch " " after 3 seconds, LCD screen shows
the "H" or "L".
Through the "▲/▼" switch "H/L". Press "▲", LCD screen display
"H", Press "▼" LCD screen display "L". "H" is the output power >
500mW; "L" is the output power <100mW.
8
Connect antenna first, then connect the power supply!
ANT
50
DC12V-1A
!
OFF - +VOL
- +VOL - +VOL
- +VOL
H- +VOL
- +VOL
L
9
Step 3:
Press the power switch " " confirm settings. The LCD screen
display 108.0MHz. This is the highest frequency of use. Through the
▲/▼" can be changed it, adjustable range:76-108Mhz.
Again press the power switch " " confirm settings, The LCD screen
display "87.00MHz". This is the lowest frequency of use, Through the
"▲/▼" can be changed it, adjustable range: 76-108Mhz..
Warning: lowest frequency high-end can not be even higher than the
highest frequency.
For example, To set the transmitting frequency range is 90MHz to
100MHz,Through the "▲/▼" changed to 100Mhz, press the power
switch " " confirm settings, follow Through the "▲/▼" changed to
90Mhz.
Step 4:
Press the power switch " " confirm settings, after 3 seconds , The
LCD screen display "OFF".
Again press the power switch " " , The transmitter Start working.
Transmitter covering Distance（Reference/kilometer）
108.00
FM MHz
ST
- +VOL
- +VOL
76.00
FM MHz
ST
- +VOL
- +VOL
Receive sensitivity Transmit power Transmit power Transmit power Transmit power
0.1～0.5W 1～2W 10～30W 30～50W
City 0.1～0.5 1～2 3～5 5～8
Town 0.2～0.6 2～3 5～8 8～10
Environs 0.3～1 3～5 8～15 10～30
Widen Plain 0.5～2 8～20 10～30 20～40
Sea communication 1～3 10～30 20～40 20～50
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