Retekess TR508 User manual

FM TRANSMITTER
TR508 - +VOL
- +VOL
108.00
FM MHz
ST
Instruction Manual
Before use, please read it carefully and properly keep

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

RF ENERGY EXPOSURE AND PRODUCT SAFETY GUIDE
This radio uses electromagnetic energy in the radio frequency (RF) spectrum
to provide communications between two or more users over a distance. RF
energy, which when used improperly, can cause biological damage.
All Retekess radios are designed, manufactured, and tested to ensure they
meet government-established RF exposure levels. In addition, manufacturers
also recommend specific operating instructions to users of the radios. These
instructions are important because they inform users about RF energy
exposure and provide simple procedures on how to control it.
Please refer to the following websites for more information on what RF energy
exposure is and how to control your exposure to assure compliance with
established RF exposure limits: http://www.who.int/en/
Local Government Regulations
When radios are used as a consequence of employment, the Local Govern-
ment Regulations requires users to be fully aware of and able to control their
exposure to meet occupational requirements. Exposure awareness can be
facilitated by the use of a product label directing users to specific user aware-
ness information. Your Retekess radio has a RF Exposure Product Label.
Also, your Retekess user manual, or separate safety booklet includes inform-
ation and operating instructions required to control your RF exposure and to
satisfy compliance requirements.
Radio License (if appropriate)
Governments keep the radios in classification, business radios operate on
radio frequencies that are regulated by the local radio management depart-
ments (FCC, ISED, OFCOM, ANFR, BFTK, Bundesnetzagentur...).To transmit
on these frequencies, you are required to have a license issued by them. The
detailed classification and the use of your radios, please contact the local
government radio management departments.
Use of this radio outside the country where it was intended to be distributed
is subject to government regulations and may be prohibited.
ATTENTION!
Before using this radio, read this guide which contains
important operating instructions for safe usage and RF
energy awareness and control for compliance with
applicable standards and regulations.
10

Unauthorized modification and adjustment
Changes or modifications not expressly approved by the party responsible for
compliance may void the user’s authority granted by the local government radio
management departments to operate this radio and should not be made. To
comply with the corresponding requirements, transmitter adjustments should
be made only by or under the supervision of a person certified as technically
qualified to perform transmitter maintenance and repairs in the private land
mobile and fixed services as certified by an organization representative of the
user of those services.
Replacement of any transmitter component (crystal, semiconductor, etc.) not
authorized by the local government radio management departments equipm-
ent authorization for this radio could violate the rules.
FCC Requirements:
•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.
•This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interference
in a residential installation.
This equipment generates uses and can radiate radio frequency energy and,
if not installed and used in accordance with the instructions,may cause harmful
interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try
to correct the interference by one or more of the following measures:
-- Reorient or relocate the receiving antenna.
-- Increase the separation between the equipment and receiver.
-- Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
-- Consult the dealer or an experienced radio/TV technician for help.
CE Requirements:
•(Simple EU declaration of conformity) Henan Eshow Electronic Commerce
Co.,Ltd declares that the radio equipment type is in compliance with the
essential requirements and other relevant provisions of RED Directive 2014/
11

53/EU and the ROHS Directive 2011/65/EU and the WEEE Directive 2012/19/
EU; the full text of the EU declaration of conformity is available at the following
internet address: www.retekess.com.
•Disposal
The crossed-out wheeled-bin symbol on your product, literature, or packaging
reminds you that in the European Union, all electrical and electronic
products, batteries, and accumulators (rechargeable batteries) must
be taken to designated collection locations at the end of their working
life. Do not dispose of these products as unsorted municipal waste.
Dispose of them according to the laws in your area.
IC Requirements:
Licence-exempt radio apparatus
This device contains licence-exempt transmitter(s)/receiver(s) that comply with
Innovation, Science and Economic Development Canada’s licence-exempt
RSS(s). Operation is subject to the following two conditions:
(1) This device may not cause interference.
(2) This device must accept any interference, including interference that may
cause undesired operation of the device.
Le présent appareil est conforme aux CNR d’Industrie Canada applicables
aux appareils radio exempts de licence. L’exploitation est autorisée aux deux
conditions suivantes :
(1) l’appareil ne doit pas produire de brouillage;
(2) l’utilisateur de l’appareil doit accepter tout brouillage radioélectrique subi,
même si le brouillage est susceptible d’en compromettre le fonctionnement.
RF Exposure Information
•DO NOT operate the radio without a proper antenna attached, as this may
damage the radio and may also cause you to exceed RF exposure limits. A
proper antenna is the antenna supplied with this radio by the manufacturer or
an antenna specifically authorized by the manufacturer for use with this radio,
and the antenna gain shall not exceed the specified gain by the manufacturer
declared.
•DO NOT transmit for more than 50% of total radio use time, more than 50%
of the time can cause RF exposure compliance requirements to be exceeded.
•During transmissions, your radio generates RF energy that can possibly cause
interference with other devices or systems. To avoid such interference, turn off
the radio in areas where signs are posted to do so.
•The device complies with RF specifications when the device used at 5mm from
your body. Third-party belt-clips, holsters, and similar accessories used by this
12

device should not contain any metallic components. Body-worn accessories
that do not meet these requirements may not comply with RF exposure
requirements and should be avoided.
•DO NOT operate the transmitter in areas that are sensitive to electromagnetic
radiation such as hospitals, aircraft, and blasting sites.
Avoid Choking Hazard
Small Parts. Not for children under 3 years.
Protect your hearing:
• Use the lowest volume necessary to do your job.
•Turn up the volume only if you are in noisy surroundings.
•Turn down the volume before adding headset or earpiece.
• Limit the amount of time you use headsets or earpieces at high
volume.
• When using the radio without a headset or earpiece, do not
place the radio's speaker directly against your ear
• Use careful with the earphone maybe possible excessive sound
pressure from earphones and headphones can
cause hearing loss
Note: Exposure to loud noises from any source for
extended periods of time may temporarily or permanently affect
your hearing. The louder the radio's volume, the less time is
required before your hearing could be affected. Hearing damage
from loud noise is sometimes undetectable at first and can have
a cumulative effect.
WARNING
Avoid Burns
Antennas
•Do not use any portable radio that has a damaged
antenna. If a damaged antenna comes into contact with the skin
when the radio is in use, a minor burn can result.
WARNING
13

Batteries (If appropriate)
•When the conductive material such as jewelry, keys or chains
touch exposed terminals of the batteries, may complete an
electrical circuit (short circuit the battery) and become hot to
cause bodily injury such as burns. Exercise care in handling any
battery, particularly when placing it inside a pocket, purse or other
container with metal objects
Long transmission
•When the transceiver is used for long transmissions, the radiator
and chassis will become hot.
Safety Operation
Forbid
•Do not use charger outdoors or in moist environments, use only
in dry locations/conditions.
•Do not disassemble the charger, thatmay result in risk of electrical
shock or fire.
•Do not operate the charger if it has been broken or damaged in
any way.
•Do not place a portable radio in the area over an air bag or in the
air bag deployment area. The radio may be propelled with great
force and cause serious injury to occupants of the vehicle when
the air bag inflates.
To reduce risk
•Pull by the plug rather than the cord when disconnecting the
charger.
•Unplug the charger from the AC outlet before attempting any
maintenance or cleaning.
•Contact Retekess for assistance regarding repairs and service.
•The adapter shall be installed near the equipment and shall be
easily accessible
•Risk of explosion if battery is replaced by an incorrect type.
Dispose of used batteries according to the instructions.
•Adapter shall be installed near the equipment and shall be easily
accessible.
•The plug considered as disconnect device of adapter.
WARNING
14

Approved Accessories
WARNING
•This radio meets the RF exposure guidelines when used with the
Retekess accessories supplied or designated for the product. Use
of other accessories may not ensure compliance with the RF
exposure guidelines and may violate regulations.
•For a list of Retekess-approved accessories for your radio model,
visit the following website: http://www.Retekess.com
•The operating temperature of the EUT can’t exceed the specified
range.
15
EU Importer
Name：Germany Retevis Technology GmbH
Address：Uetzenacker 29,38176 wendeburg

Cut along this line
.Warranty Card
Product model: Date of purchase:
Serial Number:
Seller: contact number:
contact number:
Zip code：
Username:
Address:
•
•
Remarks:
1.This guarantee card should be kept by the user, no
replacement if lost.
2.Most new products carry a two-year manufacturer’s
warranty from the date of purchase.
3.The user can get warranty and after-sales service as
below:
Contact the seller where you buy.
Products Repaired by Our Local Repair Center
4.For warranty service, you will need to provide a receipt
proof of purchase from the actual seller for verification
Exclusions from Warranty Coverage:
1.To any product damaged by accident.
2.In the event of misuse or abuse of the product or as a
result of unauthorized alterations or repairs.
3.If the serial number has been altered, defaced, or
removed.

Henan Eshow Electronic Commerce Co., Ltd.
Add: 7/F, Sanjiang Building, No.170 Nanyang Road, Huiji District,
Zhengzhou, Henan, China
Facebook: facebook.com/Retekess.ru
E-mail: [email protected]
Web: retekess.com.ru