LC90 Portable Multi-Band Internet Radio

1. Getting Started

The LC90 is powered by 2 x 18650 rechargeable lithium batteries. A USB-Type-C cable is supplied in the package.

Power On/Off: Press and hold the power button ( ) for 2 seconds to turn the radio ON or OFF. Press and hold for 5 seconds until the white screen appears to force restart the radio.

Initial Power Issue: If the radio has no power upon receipt, the 18650 battery voltage may be low due to air transportation regulations (not exceeding 3.65V). It is recommended to charge the battery for a while before use. The battery has a capacity of approximately 5400mAh and requires a longer charging time. Charging overnight is recommended for a full charge.

2. Charging Battery

Connect the Type-C cable to a 5V power adapter. Most mobile phone chargers can be used. The mobile quick charge protocol ensures the charger output voltage adjusts to 5V. Do not use chargers for iPads or computers.

Note: Charging may take longer if the radio is playing while charging.

3. Bluetooth Playback

Press the BT ( ) button to enter Bluetooth mode. On your device, open Bluetooth settings, activate pairing mode, and scan for devices. Select "Choyong-LC90" to connect. You can then play music from your device and control playback (next, previous, pause) using the radio. The connection will automatically restore when both devices are in range and the radio is in Bluetooth mode.

4. Software Update

Software updates may be released to upgrade features. Check regularly to keep your radio up to date. Caution: Do not perform any operations during the upgrade process, as it may damage the radio.

5. Telescopic Antenna Assist for Medium Wave

An auxiliary middle wave receiving circuit is integrated. Extending the telescopic antenna can increase MW signal strength and improve SNR, especially outdoors.

6. About MW (Medium Wave)

1. The radio has a built-in ferrite bar MW antenna and a telescopic antenna for MW reception. Extend the telescopic antenna to improve reception capability.
2. An external antenna can be connected using the 3.5mm headphone jack and a longer wire. This can improve reception for medium, short waves, and FM. Any pin of the 3.5mm jack can serve as a signal pin. Active MW antennas are not supported.

Q: Why is the medium-wave reception performance relatively weak?

A: Due to interference from the LCD, MW reception can be weaker. Extend the telescopic antenna to enhance performance. Testing outdoors is recommended to determine if the issue is with the radio itself. For indoor use, connecting to Wi-Fi for online radios is recommended.

7. How to Adjust Meter Band and Bandwidth

1. Meter Band: In the SW playback interface, press the middle of the first knob. When the meter band value blinks, turn the knob to adjust.
2. Bandwidth: In the SW/MW playback interface, press the middle of the second knob. When the bandwidth value blinks, turn the knob to adjust.

Location of Controls

• 1. ON/OFF: Press 2 seconds to turn ON/OFF. Press 5 seconds for forced restart.
• 2. FM mode: Short press to enter FM. Press and hold 2 seconds for FM ATS (Auto Searching and Save).
• 3. MW mode/LW mode: Short press to enter MW. Press and hold 2 seconds for MW ATS. Another short press in MW mode enters LW mode. Press and hold 2 seconds for LW ATS.
• 4. SW mode: Short press to enter SW. Press and hold 2 seconds for SW ATS.
• 5. Bluetooth mode: Short press to enter Bluetooth mode.
• 6. TF card mode: Short press to enter TF card mode. Radio needs to restart after TF-Card insertion.
• 7. Tag button: Choose internet radio stations by tag (POP, NEWS, MUSIC, ROCK, etc.).
• 8. Menu button: Open the main menu.
• 8.1 SSB+/SSB: Navigate to SSB+ (USB) or SSB- (LSB) in the menu. Enter the desired frequency using the keyboard (1KHz precision). Adjust frequency with the knob (main knob: 1KHz step, Fine Tuning: 10Hz step).
• 8.2 Voice Search Radio: Press Menu, find "Search". Long press "Lang" key as prompted. When the Mic icon flashes, speak commands like "I want to listen to BBC radio" or "Play VOA radio". Alternatively, long press the "Lang" button to activate voice search.
• 9. Language mode: Choose internet radio stations by language (German, French, English, etc.).
• 10. Lock button: Lock/unlock the keypad and knob.
• 11. Clock alert: Set alarm clock, scheduled power on/off, and play time limit.
• 12. Set UP: Enter the settings menu.
• 13. History: View recently listened radio stations.
• 14. Favorites: Bookmark favorite stations while playing. View favorites when not playing.
• 15. Confirm button: Confirm selections.
• 16. Music stations shortcut key: Access internet radio stations tagged as "Music".
• 17. Podcast stations shortcut key: Access internet radio stations tagged as "Podcast".
• 18. News stations shortcut key: Access internet radio stations tagged as "NEWS".
• 19. Add / Edit stations: Add or edit internet radio station websites.
• 20. Number buttons: Input radio frequency, Wi-Fi password, or music numbers for direct tuning.
• 21. VF/VM button: (1) Switch input method for Wi-Fi password. (2) In regular radio mode, switch between frequency tuning (VF) and saved frequency (VM).
• 22. Return button: Return to the previous menu level.
• 23. Previous: Shift to the previous song/channel.
• 24. Pause button: Pause/replay playback.
• 25. Next: Shift to the next song/channel.
• 26. TF card slot: Insert TF-Card (max 32GB) to play music. Copy/delete music by connecting to a computer. Radio needs to restart after TF-Card insertion.
• 27. SIM card slot: Supports Nano SIM Card. Radio needs to restart after SIM-Card insertion.
• 28. Multifunctional knob: (1) Tuning frequency in regular radio mode (FM 100KHz, MW 9/10KHz, SW 5KHz). Short press to enter meter-band selection. (2) Switch saved frequencies in VM Mode. (3) Switch internet radio stations in internet radio mode. (4) Short press to confirm. (5) Select and confirm in the main menu.
• 29. Fine tuning knob: (1) Fine tuning frequency in regular radio mode (FM 10KHz, MW 1KHz, SW 1KHz). (2) Switch favorite radios in favorite radios interface. (3) Short press during regular radio playing adjusts receiving bandwidth.
• 30. Volume control with switch: Turn to adjust volume. Turn counter-clockwise until a click to enter sleep mode. Turning the volume switch on resumes playback.
• 31. External antenna jack: Supports 3.5mm plug external antennas (active and passive).

Important Function Tips

How to connect Wi-Fi?

Press the ( ) button to access Wi-Fi settings. Select a Wi-Fi network and input the password using the multifunctional knob to select characters and press the knob to input. Use ( ) to switch input methods (abc/ABC). Press OK to confirm the password. The radio needs to restart to remember the password.

How to add internet radio website?

Press 'Add radio'. A QR Code will appear. Scan it with your phone's QR scanner and type the website you want to listen to.

For more details and operation tips, please check our instruction videos on YouTube: https://www.youtube.com/@choyongradio

For 24-hour service, contact: choyongradio@gmail.com

Official website URL: www.choyongradio.com

Troubleshooting

Problem: Cannot connect to Wi-Fi network

• Insufficient Wi-Fi signal strength: Check distance to router. See if other devices can connect. Optimize router placement.
• Confirm internet access: Ensure the Wi-Fi network can access the internet using the same network (e.g., browse the web).
• Wi-Fi Compatibility: This radio only supports 2.4G Wi-Fi, not 5G. Check router encryption protocol; it supports WAP/WAP2, not WAP3. Wi-Fi extenders are not supported.

Problem: Connect to network successfully, but unable to play particular stations

• The station may not be broadcasting at this time or is in a different time zone.
• The station server may be overloaded.
• The internet connection may be too slow or unstable.
• The radio station link might be outdated; contact support to update the station list.

Problem: The radio screen is black and no response, regardless of any button operation/charging

Forced restart: Press and hold the ( ) button for 5 seconds until the radio restarts (shows white screen), then release. If it still doesn't work, check if the battery needs charging.

Alternative restart: Hold down the power button for 30 seconds, release, then hold down the power button again for 5 seconds until the screen lights up. The machine should function normally. If it persists, check battery charge.

Problem: The radio freezes or has no response

Forced restart the radio: Press and hold the ( ) button for 5 seconds until the radio restarts (shows white screen), then release the button. The machine should now be functioning normally.

Product Specification

• Model: LC90
• Color: Space gray
• Weight: 640g
• Size: 200*122*40mm
• FM Frequency: 64-108MHz (Step 10KHz/100KHz)
• LW Frequency: 153-279KHz (Step 1KHz/9KHz)
• MW Frequency: 522-1710KHz (Step 1KHz/9KHz/10KHz)
• SW Frequency: 2300-29999KHz (Step 1KHz/5KHz)
• SSB Frequency: 2300-29999KHz (Step 1KHz/10KHz)
• Speaker: 15W
• Battery: Replaceable and rechargeable 18650*2
• Bluetooth version: 5.2
• TF card: Maximum 32 GB
• Earphone: 3.5mm jack
• External Antenna: 3.5mm jack
• Network: 4G Band supported: FDD Band2/3/4/5/; TDD Band38/39/40/41.

FCC WARNING

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.

Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. NOTE: 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.

The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

Specific Absorption Rate (SAR) information: This product meets the government's requirements for exposure to radio waves. The guidelines are based on standards that were developed by independent scientific organizations through periodic and thorough evaluation of scientific studies. The standards include a substantial safety margin designed to assure the safety of all persons regardless of age or health.

FCC RF Exposure Information and Statement: The SAR limit of USA (FCC) is 1.6 W/kg averaged over one gram of tissue. Device types: LC90 (FCC ID: 2BGNV-LC90) has also been tested against this SAR limit. The highest SAR values for body are 0.81 W/Kg, Hotspot is 1.34 W/Kg. This device was tested for typical body-worn operations with the product kept 0mm from the body. To maintain compliance with FCC RF exposure requirements, use accessories that maintain a 0mm separation distance between the user's body and the product. The use of belt clips, holsters and similar accessories should not contain metallic components in its assembly. The use of accessories that do not satisfy these requirements may not comply with FCC RF exposure requirements, and should be avoided. Use only the supplied or an approved antenna.

Body-worn Operation: This device was tested for typical body-worn operations. To comply with RF exposure requirements, a minimum separation distance of 0mm must be maintained between the user's body and the product, including the antenna. Third-party belt-clips, holsters, and similar accessories used by this 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. Use only the supplied or an approved antenna.