WikiSysop: Created page with "The [http://dorji.com/pro/Modules/Audio_voice_transceiver.html Dorji DRA808M] is a 70cm band (400-470MHz) FM (analog) radio transceiver module with a 1W maximum output power...."

2015-08-07T00:45:20Z

Created page with "The [http://dorji.com/pro/Modules/Audio_voice_transceiver.html Dorji DRA808M] is a 70cm band (400-470MHz) FM (analog) radio transceiver module with a 1W maximum output power...."

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The [http://dorji.com/pro/Modules/Audio_voice_transceiver.html Dorji DRA808M] is a 70cm band (400-470MHz) FM (analog) radio transceiver module with a 1W maximum output power. The radio measures 84mm x 48mm x 25mm (3.3" x 1.9" x 1"). It can be purchased from [https://www.tindie.com/products/DORJI_COM/ham-radio-amateur-radio-wireless-audio-module-walkie-talke-module/ Tindie] for $17.00 USD, incl. shipping. The module datasheet can be found [http://www.dorji.com/docs/data/DRA808M.pdf here].

==Comments==

==Testing==
All tests done at 445.925MHz

Power:
* High = xW
* Low = xW

Carrier Frequency Deviation:
* xHz (Narrow, Approx.)

Deviation:
* xkHz (Narrow, Approx.)
* xkHz (Wide, Approx.)
* xHz (PL Deviation, Wide, Approx.)

Receiver Sensitivity:
* xuV (Approx.)

Current (At 3.7V):
* RX Idle = xmA
* RX Active (Squelch Open) = xmA
* TX Low Power = xmA
* TX High Power = xA

Weight:
* DRA808M with no shield can = 2.2g
* DRA808M with shield can = 3.4g

==Component List==
{| border="1"
|style="text-align:center;" |'''Component'''
|style="text-align:center;" |'''Part Marking/Additional Text'''
|style="text-align:center;" |'''Manufacturer'''
|style="text-align:center;" |'''Function'''
|-

|RDA1845
|UB141150
|RDA - [http://www.rdamicro.com/english/Product_view.asp?id=129 RDA1845]
|Single chip transceiver, integrating synthesizer, IF selectivity and base-band signal processing. 10mW Output power.
|-

|TMS370C002A(?)
|0C002 B0C7
|Unknown
|8-Bit microcontroller
|-

|2SC3356
|R25
|[http://www.s-manuals.com/pdf/datasheet/2/s/2sc3356_nec.pdf NEC]
|NPN Transistor
|-

|Unknown
|W D
|Unknown
|Transistor (Power Amplifier)
|-

|SGM2019-3.0YN5
|YJ30
|[http://www.wandec.com/upfile/SGM2019.pdf SG Micro]
|3.0V LDO
|-

|SJK-6U-14.74569-10-80-A-15
|SJK 14.7456
|[http://www.q-crystal.com/upload/4/200942622435837072.pdf Q-Crystal]
|XTAL for Microcontroller
|-

|28.00
|28.00P D150
|Unknown
|XTAL for RDA1845
|-

|}

I have acquired the datasheet for the main radio IC, RD1845, and interestingly, the comment posted on the forum with the datasheet download was the following: "Radio chip, the transceiver has a lot of indicators can not meet the national standard! Careful use!" The datasheet can be found here: http://rev0proto.com/files/RDA1845_datasheet_v1.1e.pdf Additionally, the registers and programming info can be found here (for more adventurous hackers): http://rev0proto.com/files/RDA1845_registers_v2.3.pdf

==Additional Photos==
<gallery perrow=3 widths=180 heights=120>
File:Dra808m_topshield.jpg|Top of Module
File:Dra808m_bottom.jpg|Bottom of Module
File:Dra808m_topangle.jpg|Top of Module with shield can removed
File:Dra808m_topleft.jpg|Left (MCU/RDA) detail
File:Dra808m_topleft.jpg|Right (PA) detail
</gallery>

Dorji DRA808M - Revision history

WikiSysop: Created page with "The [http://dorji.com/pro/Modules/Audio_voice_transceiver.html Dorji DRA808M] is a 70cm band (400-470MHz) FM (analog) radio transceiver module with a 1W maximum output power...."