[chirp_users] Options not in CHIRP (UV-5R series)

Julian Gough Julian.Gough at bristol.ac.uk
Thu Aug 6 03:14:30 PDT 2015

Thanks Jim,

What I don't know at all, and what I am hoping somebody here will have an
idea about, is whether the MCU -which is what CHIRP reprograms- can
possibly be persuaded to set the register in the RDA1846 using software so
that I don't need to physically hack into the circuitry.

What I do know from the data sheet (and Lior's hacking for GMSK) is that
there is a register in the RDA1846 (register 58) and that it can be set to
013B to toggle off filtering and pre/de-emphasis. This can be achieved in
hardware by hacking into the serial communication with the RDA1846.

I'm already talking to Lior, and I've had the GT-3TP open and it's close
enough to that schematic to follow what's going on by looking at the PCB in
combination with data sheets for the chips (same RDA1846 anyway).

Julian  M1CWA

On 5 August 2015 at 23:09, Jim Unroe <rock.unroe at gmail.com> wrote:

> On Wed, Aug 5, 2015 at 10:13 AM, Julian Gough
> <Julian.Gough at 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

Julian Gough
Professor of Bioinformatics
University of Bristol
Department of Computer Science
Life Sciences building
24 Tyndall Ave, Bristol, UK, BS8 1TQ
Tel: +44 (0)117 3941211
Web: http://bioinformatics.bris.ac.uk
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