• FRS_DEMO_D Walkie talkie module/Two way radio module /test board/evaluation board

• Please note: When you place an order, please do tell us which type module do you want for DEMO_D: 1w (400M-480M), or 1w (136M-174M), or 1w (350M-390M), or 0.5w (400M-480M).

• The Demo_D with antenna, but without speaker and battery. The cost is for just one piece.

Features:

• Can be used for SR_FRS_1W (UHF/VHF), SR_FRS_0W5 (UHF/VHF), SR_FRS_1W350 module demo
• 128 X 64 pixs LCD, with background LED
• Support 100 channels or more, the transmit frequency and receive frequency of each channel can be set alone
• The transmit CTCSS and the receive CTCSS can be set separately
• All the setting can be kept when power off
• All the parameters of the module can be set just by the demo board itself; also, you may set all the parameters from PC
• Abundant functions: Li battery charging, voice intercom, SMS, monitor，scan, setting，delete, etc.
• Easy operation by use the rotary encoder
• Abundant interface for user test, evaluation, or development
• The demo board default frequencies include: Chinese, USA, Europe
• Evaluation and development 2 in 1

Demonstrate:

• Voice intercom
• Parameter setting and save
• Transmit or receive frequency can be set alone
• Transmit CTCSS or receive CTCSS can be set alone: 00-121
• Mic sensitivity：1-8
• Voice scram: 0-8
• Vox level：0-8
• SQ level: 0-8
• Volume level：1-9
• Auto power save：Enable/Disable
• Bandwidth setting：Narrow band/broadband
• Transmit time limit: 0-9 Min
• Transmit power setting: HI/LO (invalid for 0.5W)
• Bandwidth setting: Narrow/Wide
• Companding: On/Off
• Short message /Data transfer transceiver
• 100 channel’s parameter can be set and saved -
• Support the parameter setting by key or from PC
• Scan
• SMS/Data transfer
• Monitor
• Charge
• Support up to 500mA charge current to the lithium battery
• Restore the factory setting
• Display: LCD, 128 X 64, with background lights

• Development:

• Push J7，J8 to “USER” position，The user can set all of the FRS parameter via external MCU or PC

LED

• Charge LED: Red, Li battery charge indication
• Charge Full LED: Green, when charge finished, it turns ON
• Power LED: Blue, Power on indication
• Tx LED: Red, when transmit, it turns ON
• Rx LED: Green, when valid signal received, it turns ON

Interface:

• DC power jack: 3.3V-5V. An external DC power or Li battery is acceptable; the up side is positive and the lower side is negative.
• Speaker jack: the speaker can be above 4R with 1-3 watt
• Multi-function earphone: User can make the voice intercom via operate the earphone
• A PTT key, a microphone, a speaker is integrated on the earphone
• Please note that the 3rd part earphone do not be used for this demo board. If user need it, please contact us to get it.
• MCU debug and program download;
• UART port, it must be TTL 3V level, it must not be RS232 level. GND, RXD: the RXD of UART tool, TXD: the RXD of UART tool.

User interface:

• GND
• PTT: Pull LO，transmit；NC, receive
• LINE_IN: The external audio source input, then it is transferred by the module; the demo board has made an attenuation of about 75%
• The input signal should be less than 20MV; the audio frequency can only support 300 – 3000HZ
• LINE_OUT: The audio output is from the module “AF_OUT”, It is not amplified by the audio amplifer;
• SQ: Receive signal indication; it is Low when there is a valid signal income; otherwise it is high;

Communication port selection:

• When in DEMO mode(push the switch to right position), it can demo all the function
• When in USER mode(push the switch to left position), user can operate the Frs module directly, user can make a development via the J6 interface

Audio source selection:

• In DEMO mode, the microphone on board is selected
• In USER mode, the external audio source is selected, the external audio input via the “Line in “ of J6

USB:

• It can be used to charge the Li battery
• It can be used for command setting or data transfer/SMS

Comment for J5, USB:

• J7, J8 at DEMO mode: the user can make the parameter setting or data transfer by the USB or J5; when at demo mode, the command of user is sent to HOST Mcu firstly, then checked by the MCU, the command is sent to the FRS module by the MCU; the command is saved into EEPROM and can be kept when power off.
• J7, J8 at USR mode: USB or J5 is connected to the FRS module directly, it is not connected to the MCU at all, so the user can operate the FRS module directly, it doesn’t via the MCU; so the parameter can’t be saved.

Key:

• [PTT] Push to talk
• [MON] Monitor
• [SCAN] Auto scan. When in standby state, press [Scan] key, the system into the auto scan state. When in setting state, the cursor go back to the previous setting. When in SMS edit state, it act as the “Backspace”.
• [SMS] Short message demo. When in standby state, press [SMS] key, the system into the SMS function demo mode. When in SMS demo mode, press [SMS] key, exit SMS demo mode. When in setting state, the cursor go back to the first parameter setting. When in SMS edit state, it act as the “Backspace”.
• [ENCODE] Rotate the encode switch to increase or decrease the setting number
• [ENTER] Press the encode switch

===============================================================================================

• 1) for detail spec. please contact us to get it.
• 2) the demo board is subject to be upgraded without notice.