HamGeek TEF6686 Portable Full Band Receiver WiFi/Bluetooth FM/SW/MW/LW Radio with 2.8-inch IPS Touch Screen

Basic Parameters:
- Main control chip: ESP32-WROOM-32U, Flash 4MB, WiFi + Bluetooth dual core module
- Display technology: 2.8-inch 320x240 resolution, IPS full view LCD screen with resistive touch
- Control mode: default numeric keypad input and knob tuning, also supports third-party touch screen firmware
- Antenna interface: external antenna is used for all frequency bands, with standard SMA female connector
- Speaker output: using for TI audio amplifier chip TPA6211A1, it drives a 45x45mm large-sized sound cavity speaker with a power of 4ohm/3W, resulting in lower output noise and distortion.
- Earphone output: using for AD headphone amplifier chip MAX97220, standard 3.5mm audio connector output, speaker and headphone independent dual amplifier design, optimized for mutual benefit.
- Battery parameters: 3.7V/5000mAh, 18.5Wh, lithium battery size of 65x55x10mm
- Current consumption: about 3.7V/350mA, usage time is about 15 hours
- Communication interface: built-in CH340 USB to serial chip, communicates externally through TYPE-C interface
- Size and weight: 142 x 30 x 80mm (excluding antenna connectors and antennas length), body weight of 300g

Frequency Range:
- FM:
  65 - 108MHz: suitable for Russia/Eastern Europe
  76 - 95MHz: suitable for Japan
  76 - 108MHz: suitable for campus broadcasting
  87 - 108MHz: suitable for Europe/Oceania/Africa/Asia
  87.5 - 108MHz: suitable for China/USA
  OIRT default step is 30kHz, FM step is 50/100/200kHz, default is 100kHz
- SW: 1700 - 27000kHz, default step is 5kHz
- MW: 522 - 1791kHz, default step is 9kHz; 520 - 1720kHz, default step is 10kHz
- LW: 144 - 513kHz, default step is 9kHz

Receiving (Receiving sensitivity/selectivity):
- FM: FM (S/N=30dB)≤0.5uV; FM≥60dB (+150kHz)
- SW: SW (S/N=20dB)≤10uV; SW≥60dB (BW=3kHz/±5kHz)
- MW: MW (S/N=20dB)≤10uV; MW≥60dB (BW=3kHz/±9kHz)
- LW: LW (S/N=20dB)≤10uV; LW≥60dB (BW=3kHz/±9kHz)

Basic Operation:
- Main Switch: The machine's main switch, OFF position is to disconnect the battery, ON position is to connect the battery. Please turn off this switch when the machine is not in use for a long time to prevent accidental power on.
- POWER button: Power button, short press to switch between power on and off states.
- TUNING knob: Rotate to adjust frequency, short press to step switch, long press to turn on iMS and EQ.
- VOLUME knob: volume adjustment
- SQL gear: static noise level adjustment
- BW button: bandwidth selection
  Short press in FM mode: stereo/mono switch
  Long press in FM mode to switch demodulation bandwidth between 56/64/72/84/97/114/133/151/168/184/200/217/236/254/287/311kHz/AUTO BW, or press and hold the BW button and use the TUNING knob to select.
  Short press in AM mode: Switch demodulation bandwidth between 3/4/6/8kHz.
- MODE button: Adjustment mode
  Short press: MAN (manual frequency modulation)/AUTO (automatic search)/MEM (storage operation) mode switch
  Long press: Open menu page
- BAND button: Band selection
  Short press: Band switching, switching between LW/MW/SW/OIRT/FM
  Long press in FM mode: Open advanced RDS view/Alternative Frequency view
  Press and hold for more than 5 seconds: Sleep or turn off screen
- Storage radio process:
(1) Tune to the radio station you want to store in the preset.
(2) Switch the MODE button until you see "MEM" highlighted.
(3) Press the TUNING button, and "MEM" will turn red.
(4) Select the desired storage channel. You will see colors on the preset number: red indicates that the frequency has been stored on this preset, and green indicates that there is no frequency stored on this preset.
(5) Press the TUNING button again to store the preset.

Advanced Operation:
- Change encoder direction: Press and hold the BW button when turning on the device.
- Rotating screen: Press and hold the MODE button when turning on the device.
- Restore default settings: Press and hold the BW and TUNING knobs when booting up.

Package Included:
- 1 x HamGeek Main Unit
- 1 x USB Cable
- 1 x Telescopic Antenna