I was able to see if I could control the frequency of the UV-5R.
How? Open the Cover and look!
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZMVtBOlfCvbeOYkIMSi-IotddyIU9j1FVDLoCY0OXB5kgJXhGUKXcd17GZjJxJMmfpqrm9Zieksfpi5VplUJU4dwQGnfQGAp-etfqo80kbfSvmOF07HP4vcCkMIdoPaxfm-mjcZ0w-Fw/s320/20171211_094059.jpg)
if you want to completely disassembled the UV-5R, you will have to find the hidden screw under the LCD.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh9ApCPj_tXTU6goutBhFrflPwzVV3T9B4np2ETzEccJ4HeeMSUC9R9S921yFaZ0pridTAVCT2DpZoiZ1ruaQF9QsuBI5bmqWRF1AUPc38W4iMbT_9iMPp85-H1ki8DMbvJ6NMWj8pSnpE/s320/20171211_123258.jpg)
The MCU ( MB95F013K) shown in the picture below is the main controller of the transceiver.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9KwowgrBE3cY8VtEo2Jji_viRipb-fhIZsBftkU-AWhAlCmG8iFIMCBXS30pefk-tk1uHmIeB8RGAdRUIMiZaGqM2bcOOgZZvv2c-PmmNnF9vz3lH3LmAcT6jBhQ74q3F2v32xTKjKaE/s320/20171209_230136.jpg)
and The RF Controller (Left chip marked - 1846 - RDA1846) shwon in the picture covers VHF and UHF.
http://www.radiomanual.info/schemi/Vari/Baofeng_UV-3R_RDA-1846_prog.pdf
VHF : 134~174MHz, 200~260MHz (but, only 134~174 VHF present on UV-5R)
UHF : 400~520MHz
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPqpwVToEWzwZSfONTCw7DUcPTGVXwvkgI7CpB-6zfuujpdAHZPdqNBLl-PDBpQVjh4NZOZi4RZH3Xgx-OjzaxBn6OT0tpxo1RcJI2BkP3aNvEnsYIG5zJb9qgPVhjbeOBZLY5tTJIeBk/s320/20171209_230151.jpg)
RDA1846 has as 24Mhz oscillator connected,
if you replaced other frequency osclillator, perhap the frequency ramge pf use of the radio will change.
https://qrzcq.com/pub/RADIO_MANUALS/BAOFENG/Baofeng--UV-5R-Schematic.pdf
Components such as filters due to frequency changes will have to change together.
How? Open the Cover and look!
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZMVtBOlfCvbeOYkIMSi-IotddyIU9j1FVDLoCY0OXB5kgJXhGUKXcd17GZjJxJMmfpqrm9Zieksfpi5VplUJU4dwQGnfQGAp-etfqo80kbfSvmOF07HP4vcCkMIdoPaxfm-mjcZ0w-Fw/s320/20171211_094059.jpg)
if you want to completely disassembled the UV-5R, you will have to find the hidden screw under the LCD.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh9ApCPj_tXTU6goutBhFrflPwzVV3T9B4np2ETzEccJ4HeeMSUC9R9S921yFaZ0pridTAVCT2DpZoiZ1ruaQF9QsuBI5bmqWRF1AUPc38W4iMbT_9iMPp85-H1ki8DMbvJ6NMWj8pSnpE/s320/20171211_123258.jpg)
The MCU ( MB95F013K) shown in the picture below is the main controller of the transceiver.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9KwowgrBE3cY8VtEo2Jji_viRipb-fhIZsBftkU-AWhAlCmG8iFIMCBXS30pefk-tk1uHmIeB8RGAdRUIMiZaGqM2bcOOgZZvv2c-PmmNnF9vz3lH3LmAcT6jBhQ74q3F2v32xTKjKaE/s320/20171209_230136.jpg)
and The RF Controller (Left chip marked - 1846 - RDA1846) shwon in the picture covers VHF and UHF.
http://www.radiomanual.info/schemi/Vari/Baofeng_UV-3R_RDA-1846_prog.pdf
VHF : 134~174MHz, 200~260MHz (but, only 134~174 VHF present on UV-5R)
UHF : 400~520MHz
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPqpwVToEWzwZSfONTCw7DUcPTGVXwvkgI7CpB-6zfuujpdAHZPdqNBLl-PDBpQVjh4NZOZi4RZH3Xgx-OjzaxBn6OT0tpxo1RcJI2BkP3aNvEnsYIG5zJb9qgPVhjbeOBZLY5tTJIeBk/s320/20171209_230151.jpg)
RDA1846 has as 24Mhz oscillator connected,
if you replaced other frequency osclillator, perhap the frequency ramge pf use of the radio will change.
https://qrzcq.com/pub/RADIO_MANUALS/BAOFENG/Baofeng--UV-5R-Schematic.pdf
Components such as filters due to frequency changes will have to change together.
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