June 6, 2018 C:\Users\LDRA_Fish9\Downloads\IMG_20170723_200741.jpg

Walkie Talkie Module/Shield(Planning)

VHF Walkie Shield/Board

This project would be self contained walkie module with touch screen with provision for external power supply.The board will be based on Dorji VHF module (Reference: 1) and will be based on Atmel Uno based architecture.

https://ae01.alicdn.com/kf/HTB1r4OKLVXXXXakXXXXq6xXFXXXE/205618556/HTB1r4OKLVXXXXakXXXXq6xXFXXXE.jpg?size=113521&height=810&width=810&hash=2ef5ffb263549be8c7639b040059f65e https://ae01.alicdn.com/kf/HTB19EY2GXXXXXb5XpXXq6xXFXXXV/221876397/HTB19EY2GXXXXXb5XpXXq6xXFXXXV.jpg?size=59593&height=649&width=892&hash=4b0bf68c26baaa9654aa34b772f41b10

TRRS 3.5 MM

Design Goal:

  1. The VHF module(DRA818V) will need external audio amplifier(LM series audio amplifier can be considered)
  2. The board will have provision for handsfree Mic/Speaker Set(3.5mm, Reference: 4
  3. Otherwise, 3.5 mm standard jack can be used for speaker+mic and TRRS 3.5 mm socket can be used on the board.
  4. The 2.4 Inch Touch screen(SPI based) would be used to change the configuration
  5. The output of the VHF module will be routed SMA female connector mounted on board
  6. There might be a rotary switch fine tune the frequency of operation
  7. There would be USB socket for external programming
  8. Power socket would be provided for board for external DC power(VHF module will draw power)
  9. VHF module is controlled by UART input (and 3.3 Voltage compliant, so the board will need to be 3.3 voltage tolerant)
  10. One DIY project could refereed as http://www.kh-gps.de/dra.htm
  11. One commercial VHF shield project https://www.kickstarter.com/projects/749835103/hamshield-for-arduino-vhf-uhf-transceiver
  12. Our project would be similar to above project but it would be complete board unlike a shield
  13. The board can be used as arduino uno type of board (all the uno like pins would be exposed).
  14. No pins of VHF module would be connected to Atmel controller pin via PCB track, it would be connected by jumpers.
  15. Demo VHF DIY board is available for rapid protyping

http://www.f4huy.fr/wp-content/uploads/2016/01/DRA818V_Trackuino.PNG

Reference:

  1. http://dorji.com/products-detail.php?ProId=55
  2. http://www.dorji.com/docs/data/DRA818V.pdf
  3. http://dorji.com/docs/app/ADW1003_DRA808M.pdf
  4. https://www.aliexpress.com/item/Hand-free-microphone-shoulder-speaker-for-Yaesu-VX6R-VX7R-VX177-VX170-ft270r-ft277r-etc-walkie-talkie/32679826783.html?Photos:

C:\Users\LDRA_Fish9\Downloads\IMG_20170723_200741.jpg

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https://pic.409shop.com/photo/46-y.jpg

Image result for 3.5 mm +audio+mic

https://ksr-ugc.imgix.net/assets/004/070/286/ba72e2b11cf97d8eda107d090f2ecdac_original.jpg?w=680&fit=max&v=1435678411&auto=format&q=92&s=13b9b401b6d481d9c713ea255ea51bf6

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Image result for dra818v pin

 

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