Duplex MMDVM Hotspot Board UHF VHF Buil-in Antenna Support P25 DMR YSF for Raspberry Pi Zero W 0W 2W 3B+ 4B 4B+
Direct purchase from the factory 
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Anyị ga-agba mbụ bufee ihe gị mgbe anyị nwetasịrị iwu gị ma hụ na ha ruru n'udo. A ga-enye nkọwa nnyefe na email nkwenye gị.N'ọtụtụ oge, a na-edozi iwu n'ime ụbọchị 2.N'ọnọdụ pụrụ iche, ọ ga-egbu oge dị ka ndị a: Mgbe ị tinyere iwu na Satọde, Sọnde ma ọ bụ ezumike ọha, ọ ga-egbu oge maka ụbọchị 2..Ọ na-adịkarị mkpa ụbọchị ọrụ 5-7 (Mọnde ruo Fraịde) na-enweghị mmetụta site na igbu oge ụgbọ elu ma ọ bụ ihe gburugburu ebe obibi ndị ọzọ..Ebe ọ bụ na ọrụ mbupu anyị bụ n'ụwa niile, oge nnyefe ga-adabere na ọnọdụ gị, yabụ ọ nwere ike ịchọ oge ụfọdụ ma bụrụ na ị nọ na mpaghara ma ọ bụ mba ndị dịpụrụ adịpụ, jiri nwayọọ chere.1. Amụma nlọghachi & mgbanwe
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2.Amụma nkwụghachi ego
Ị ga-enweta nkwụghachi ego zuru ezu ma ọ bụ kredit ụlọ ahịa 100% mgbe anyị nwetasịrị ngwugwu a laghachiri ma lelee ya. A ga-edozi nkwụghachi ego ma kwụọ ya na ụzọ ịkwụ ụgwọ mbụ gị na-akpaghị aka. Biko rịba ama na ụgwọ mbupu na ụgwọ ọ bụla ma ọ bụ ụgwọ anaghị akwụghachi. A naghị akwụghachi ụgwọ mbupu ndị ọzọ ozugbo ebugara ngwugwu ahụ. Ị na-ahụ maka ịkwụ ụgwọ ndị a na anyị enweghị ike ịhapụ ma ọ bụ kwụghachi ha, ọbụlagodi ma ọ bụrụ na eweghachiri iwu ahụ anyị.Ọ bụrụ na ị nwere nsogbu ọ bụla gbasara usoro nkwụghachi ego, biko kpọtụrụ anyị. service@roymall.com ma ọ bụ Whatsapp: +8619359849471Product Name: Duplex MMDVM Hotspot Board
Frequency Support: UHF 430-440MHZ, VHF 140-150MHz
Compatibility: Raspberry Pi Zero W, 2W, 3B+, 4B, 4B+
Modem Type: STM32-DVM/MMDVM_HS-Raspberry pi Hat(GPIO)
Onboard Antenna: Yes
This link is only for Mini Duplex MMDVM boardsSetting up Pi-star software and raspberry hardware (rpi 0-3) New pi4b needs to remove Right SocketPi-star general configuration for MMDVM_DUPLEXSet controller mode: duplex repeater or simpleRadio frequency: Freq: 144-148, 219-225, (main frequency band) 420-475, 842-950Duplex mode: Example: RX:438.000000 TX:433.000000Duplex mode: Example: RX:145.000000 TX:433.000000Simple mode: Example: RX:438.000000 TX:438.000000Radio/Modem Type: STM32-DVM/MMDVM_HS-Raspberry pi Hat(GPIO) or any other (GPIO board)Options: (not needed now, some older boards need to be set)Admin->Expert->Edit MMDVMHOST->RXOFFSET=0 TXOFFSET=0 (default value in pistar)(Update: 2019/2 new 3225 TCXO so 0ffset is 0 )Update new firmware: (pi-star/Expert/ssh access/user:pi-star pass:raspberry)sudo pistar-mmdvmhshatflash hs_dual_hatThe default bit error rate is less than 5%, and the default 0ffset is 0. If the bit error rate is greater than 5%, as long as the signal can be received, it can be corrected through 0ffset.
Features:
1. Versatile: This duplex MMDVM hotspot supports DMR, P-25, D-Star, and System Fusion, accommodating various radio communications preferences.
2. Raspberry Pi Compatible: The hotspot mounts cleanly on all current types of Raspberry Pi, inclusive of the Pi Zero W, 2W, 3B+, 4B, and 4B+, making it ideal for Raspberry Pi enthusiasts.
3. Dual Mode: The device supports both Duplex and Simplex modes, allowing for flexible communication sessions. In Duplex mode, it supports 2 time slots with simultaneous Tx and Rx.
4. No Ofset Required: With the best adjustment set at TX=0, RX=0, this device requires no ofset, simplifying the setup process for users.
5. Indicator LEDs: The board includes built-in LEDs that indicate status, along with status words on the shell for clear and straightforward device operation.
Package Includes:
1 x Duplex MMDVM Hotspot Board
