On Wed, Aug 5, 2015 at 10:13 AM, Julian Gough
<Julian.Gough@bristol.ac.uk> wrote:
> Does anybody know if it is likely to be possible to program options not
> available through the interface?
>
> I have a pair of Baofeng GT-3TP (basically the UV-5R). I want to run 9600
> baud packet over them and have found that in the RDA1846 chip:
> http://www.uv3r.com/images/Schematic-Baofeng-UV5R.pdf
> there is an option to turn off filtering and pre/de-emphasis. Set register
> 58 to 023B
>
> My current option for doing this is to physically hack into the serial bus,
> insert a switching chip and use a raspberry pi to switch control away from
> the radio's onboard microcontroller chip to the raspberry pi serial GPIOs,
> program this option into the RDA1846 and then switch back control to the
> radio. Pretty heavy work for something that might be possible in software by
> programming the onboard controller (using CHIRP).
>
> Any guidance very much appreciated.
>
> Julian M1CWA
>

I don't know how CHIRP would do this unless the radio reads and writes
this register to memory. If it does, and I doubt that is does, you
would need to know which memory location this was.

You might not that the schematic that you referenced was made
available in early 2012. It is know to have many mistakes. There is
nothing on it that shows that it was made by Baofeng. And these radios
have gone through a few generations since then.

You might contact Lior Elazary, KK6BWA. He is familiar with hacking
the UV-5R and UV-B5.

elazary.com/index.php?option=com_content&view=article&id=49:hacking-the-baofeng-uv5r&catid=14:baofeng-uv5r&Itemid=17

Jim KC9HI