Page 3 of 8 Hacking the radio Before trying to change anything I posted on the yahoo groups to see what I would need to insure that I will not radiate any RF energy. I found out that I could not just remove the antenna, and would need to place a dummy load. Per James Hall suggestion I ordered a dummy load from here. As soon as I got the radio, I signed up to take the license test. Unfortunately, the next one is on Jan 20. I can not wait to get licensed, so I can finally transmit and test this on the HAM frequencies. I also have not done anything with TX on this radio yet, which I am so attempted to try to see if that works.So for now I am just going to try to RX until I get my license.
Baofeng Uv 5r Frequency
Looking at the schematics, there are two main ICs on the radio. The first one is RDA1846 which does all the radio communications, and the other is an microcontroller which controls the, LCD, keypad, etc. I first tried to solder some wires directly onto the RDA1846 TX/RX pins and monitor them to see what the radio sends the chip.
Celebrity apprentice pc game. First, I was hoping that the microcontroller will not communicate with the RDA1846 under various conditions (like switching to the RDA5802 FM radio) so I can also send commands to it. However, I monitored the SCLK and SDIO and it looks like its under constant communication. Since P93 and P92 are shared with the LCD (DB6, and DB7) as well as the keypad, the uv5r MCU is constantly setting/reading these pins. So their code probably has a loop setting the LCD, reading the keypad, and then transmitting serial commands to the RDA1846. To resolved this I lifted P93 and P92 legs from the MCU (SCLK and SDIO) and solder two wires to it. I also soldered another line to P77 which is the SEN line. From the schematics, it looks like the MODE pin is tied to V+, which means it's communicating via SPI instead of I2C and the SEN line is used for EN.
I hooked up an arduino to the pins and tried to communicate over SPI, with no success. However, I should have not rushed into things, and noticed that the chip is 3.3V and not 5V (I was looking in their programming manual the whole time, and should have read the datasheet first). Another small setback happened when I tried to remove the SEN pin, and the pcb trace lifted right up. So much for communicating with SPI, but luckily the chip can communicate over I2C, so I placed some solder on the RDA1946 chip to place it into I2C mode and remove the V+ tied to the MODE pin. I also traced all the pins out of the cpu to insure that I know what each pin is doing.
Home Ham Baofeng Radios Hacking the Baofeng UV5R - Opening The Radio. Hacking the Baofeng UV5R - Opening The Radio Sunday. Hacking the UV-B5. BaoFeng Radio Programming Software Download Homepage, CHIRP Programming Software. BaoFeng UV-82 and UV-82X Series; BaoFeng BF-F8 and UV-5R Series; Radios. Baofeng UV-5R: Extreme Receive Modification. I have a baofeng uv 5r and I can use 490.mhz range with no hack I can go between 400-520. Baofeng UV-5R: Software v2.