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Operation

Warranty

Introduction

27

Nothing 

Comes Close to a Cobra

®

Customer Assistance

26 English

FCC License and 
Product Service

Product Service Questions

If you have any questions about operation or installing 
your new Cobra product, or if you are missing parts… 

Please call Cobra first! DO NOT RETURN THIS PRODUCT
TO THE STORE! See customer assistance on page A1.

For Products Purchased in the U.S.A.

If your product should require factory service, please call Cobra first 

before sending your radio. This will ensure the fastest turn-around 

time on your repair. You may be asked to send your radio to the 

Cobra factory. It will be necessary to furnish the following to have 

the product serviced and returned.

1) For warranty repair include some form of proof-of-purchase, 

such as a mechanical reproduction or carbon of a sales receipt. 

If you send the original receipt, it cannot be returned. 

2) Send the entire product. 

3) Enclose a description of what is happening with the radio. 

Include a typed or clearly printed name and address of where 

the radio is to be returned. 

4) Pack radio securely to prevent damage in transit. If possible, 

use the original packing material. 

5) Ship prepaid and insured by way of a traceable carrier such as 

United Parcel Service (UPS) or Priority Mail to avoid loss in 

transit to Cobra Factory Service, Cobra Electronics Corporation, 

6500 West Cortland Street, Chicago, Illinois 60707 U.S.A. 

6) If the radio is in warranty, upon receipt of your radio, it will 

either be repaired or exchanged depending on the model. 

Please allow approximately three to four weeks before 

contacting Cobra for status. If the radio is out of warranty, 

a letter will automatically be sent informing you of the repair 

charge or replacement charge. If you have any questions, 

please call 773-889-3087 for assistance.

For Products Purchased Outside the U.S.A.

Please contact your local dealer for product service information.

IMPORTANT NOTICE: FCC LICENSE REQUIRED

This two-way radio operates on GMRS (General Mobile Radio Service) frequencies

which require an FCC (Federal Communications Commission) license. A user must

be licensed prior to operating on Channels 1 through 7 on high power or 15

through 22, which comprise the GMRS channels of this radio. Serious penalties

could result for unlicensed use of GMRS channels, in violation of FCC rules.

Operation of this radio is subject to additional rules specified in 47 C.F.R. Part 95. 

Licensed users will be issued a call sign by the FCC, which should be used for

station identification when operating this radio. GMRS users should also cooperate

by engaging in permissible transmissions only, avoiding channel interference with

other GMRS users, and being prudent with the length of their transmission time. 

For licensing information and application forms, please call the FCC Hotline 

at 800-418-FORM. Request form #159 and form #605. Questions regarding 

the license application should be directed to the FCC at 888-CALL-FCC. 

Additional information is available on the FCC’s website at www.fcc.gov.

Channel 1 through 7 on low power and channels 8 through 14 comprise the 

FRS (Family Radio Service). No license is required to operate on the FRS.

Safety Information for microTALK

®

Radios

Your wireless handheld portable transceiver contains a low power transmitter.

When the talk button is pushed, it sends out radio frequency (RF) signals. 

The device is authorized to operate at a duty factor not to exceed 50%. 

In August 1996, the Federal Communications Commission (FCC) adopted 

RF exposure guidelines with safety levels for handheld wireless devices. 

Important

FCC RF Exposure Requirements: For body-worn operation, this radio has 

been tested and meets the FCC RF exposure guidelines when used with Cobra

accessories supplied or designated for this product. Use of other accessories 

may not ensure compliance with FCC RF exposure guidelines. Use only the

supplied antenna. Unauthorized antennas, modifications or attachments 

could damage the transmitter and may violate FCC regulations. 

Normal Position

Hold the transmitter approximately two inches from your face and 

speak in a normal voice, with the antenna pointed up and away.

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.

FCC Warnings: Replacement or substitution of transistors, regular diodes or
other parts of a unique nature, with parts other than those recommended by
Cobra may cause a violation of the technical regulations of part 95 of the FCC
rules, or violation of type acceptance requirements of part 2 of the rules.

Customer Assistance

Summary of Contents for LI 3900DX

Page 1: ...Owner s Manual Nothing Comes Close to a Cobra English TWO WAY RADIO MODEL LI 3900DX Printed in China Part No 480 249 P Version B ...

Page 2: ... prefer For Assistance in the U S A In this user s manual you should find all the information you need to operate your microTALK radio If you require further assistance after reading this manual Cobra Electronics offers the following customer assistance services Automated Help Desk English only 24 hours a day 7 days a week 773 889 3087 phone Customer Assistance Operators English and Spanish 8 00 a...

Page 3: ...munication under ideal conditions Features 22 Channels Seven shared with FRS GMRS seven FRS only eight GMRS only 121 Privacy Codes 38 CTCSS codes 83 DCS codes Hands Free Operation VOX VibrAlert Silent Paging 10 Channel Memory Signal Strength Meter Scan Channel privacy codes memory Selectable Hi Low Power In GMRS Backlit LCD Display Button Lock Call Alert 10 selectable tones Speaker Microphone Char...

Page 4: ... ion battery pack Position battery pack according to polarity markings 4 Replace battery compartment cover and belt clip Estimated operation time on full charge 10 hours Rechargeable battery packs must be recycled or disposed of properly in compliance with all applicable laws They may not be thrown in the trash Certain states or municipalities require recycling and have established collection prog...

Page 5: ...on will blink Your batteries should be recharged Auto Battery Save Your microTALK radio has a unique circuit designed to extend battery life If there are no transmissions for 10 seconds the radio will automatically switch to Battery Save mode and the Power Saver icon will flash in the display This will not affect the radio s ability to receive incoming transmissions Communicating with Another Pers...

Page 6: ...erson will hear a two second call tone This tone is used only to establish voice communications See page 23 on how to select from 10 available call tone settings Low Power Icon Hi Power Icon Operation Hi Low Button Selectable High Low Power Output When in close proximity to another party or during favorable conditions you can switch from High to Low Power to extend battery life This feature applie...

Page 7: ...annels 8 through 14 your radio automatically switches to low power which will limit the range the radio can communicate Remember you can achieve maximum range by using maximum range extender See page 6 for details 6 English Using Your Radio Auto Squelch Maximum Range Your microTALK radio is equipped with Auto Squelch which automatically shuts off weak transmissions and unwanted noise due to terrai...

Page 8: ... used on the same channel at the same time To successfully communicate using a privacy code both the sending and receiving radios must be tuned to the same channel and to the same privacy code system CTCSS or DCS and privacy code number Each channel will remember the last privacy code system and number you select The privacy code 00 is not a privacy code but allows all signals to be heard on a cha...

Page 9: ...annel Down button to change the setting 3 Choose one of the following a Press the Mode button to enter the selected setting and proceed to other functions b Press the Lock Enter button to enter the selected setting and return to Standby mode VOX Sensitivity Level Mode Button Channel Buttons VOX Icon Mode Button Channel Buttons Set DCS Privacy Codes To select a DCS privacy code 1 After selecting a ...

Page 10: ...se one of the following a Press the Channel Up or Channel Down button to select a CTCSS privacy code 01 through 38 for the channel b Press the Lock Enter button to switch from CTCSS to DCS The DCS icon and privacy code numbers will flash on the display The Channel Up or Channel Down button can then be used to select a DCS privacy code 01 through 83 for the channel If OFF flashes in place of the pr...

Page 11: ...vacy code displayed before you entered mode functions While de programming a memory location if you do not press any buttons for 15 seconds your radio will automatically return to Standby mode on the channel privacy code displayed before you entered mode functions Channel 0 To recall a stored memory channel location 1 Press the Mode button until the Memory icon and the memory location number flash...

Page 12: ...smission This will then return the radio to Standby mode b Press the Mode button to proceed to set privacy code scan on the channel that was either displayed before you entered mode functions or on which during channel scanning you last received a transmission see page 18 for further details c Press the Lock Enter button to return to Standby mode on the channel privacy code that was displayed befo...

Page 13: ...ation scan see page 20 for further details c Press the Lock Enter button to return to Standby mode on the channel privacy code that was displayed before you entered mode functions or the channel privacy code on which during scanning you last received a transmission Privacy Code Scan Your microTALK radio can automatically scan the Privacy Codes either CTCSS 01 through 38 or DCS 01 through 83 within...

Page 14: ...er button to return to Standby mode on the channel privacy code that was displayed before you entered mode functions or the memory location on which during scanning you last received a transmission To reduce the number of memory locations being scanned you may de program any unwanted locations See page 15 to de program a memory location Memory Location Scan Your microTALK radio can automatically s...

Page 15: ...or off setting is displayed 2 Press the Channel Up or Channel Down button to select roger beep on or off 3 Choose one of the following a Press the Mode button to enter the new setting and proceed to other functions b Press the Lock Enter button to enter the new setting and return to Standby mode Roger Beep On VibrAlert and Call Alert Your microTALK radio can alert you to incoming signals by soundi...

Page 16: ...annel numbers for the same frequency For example a Cobra 15 Channel GMRS model would need to be tuned to Channel 11 in order to communicate with a 22 Channel GMRS tuned to Channel 15 Please refer to the chart below for channel frequency number compatibility A Channel No for 22 Channel FRS GMRS Models B Channel No for 15 Channel GMRS Models C Type of Radio Service D Frequency in MHz E Power Output ...

Page 17: ...t for unlicensed use of GMRS channels in violation of FCC rules Operation of this radio is subject to additional rules specified in 47 C F R Part 95 Licensed users will be issued a call sign by the FCC which should be used for station identification when operating this radio GMRS users should also cooperate by engaging in permissible transmissions only avoiding channel interference with other GMRS...

Page 18: ...duct 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 4 If the owner of the product resides outside the U S A All implied warranties including warranties of merchantability and fitness for a particular purpose are limited in duration to the length of this warranty Co...

Page 19: ...dios Radar Laser Detectors Safety Alert Traffic Warning Systems Handheld GPS Receivers Mobile GPS Navigation Systems HighGear Accessories CobraMarine VHF Radios CobraMarine Chartplotters Power Inverters Accessories For more information or to order any of our products please visit our website www cobra com ...

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