<div dir="ltr">Thanks Jim,<div><br></div><div>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.</div><div><br></div><div>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.</div><div><br></div><div>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).</div><div><br></div><div>Julian M1CWA</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 5 August 2015 at 23:09, Jim Unroe <span dir="ltr"><<a href="mailto:rock.unroe@gmail.com" target="_blank">rock.unroe@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Wed, Aug 5, 2015 at 10:13 AM, Julian Gough<br>
<<a href="mailto:Julian.Gough@bristol.ac.uk">Julian.Gough@bristol.ac.uk</a>> wrote:<br>
> Does anybody know if it is likely to be possible to program options not<br>
> available through the interface?<br>
><br>
> I have a pair of Baofeng GT-3TP (basically the UV-5R). I want to run 9600<br>
> baud packet over them and have found that in the RDA1846 chip:<br>
> <a href="http://www.uv3r.com/images/Schematic-Baofeng-UV5R.pdf" rel="noreferrer" target="_blank">http://www.uv3r.com/images/Schematic-Baofeng-UV5R.pdf</a><br>
> there is an option to turn off filtering and pre/de-emphasis. Set register<br>
> 58 to 023B<br>
><br>
> My current option for doing this is to physically hack into the serial bus,<br>
> insert a switching chip and use a raspberry pi to switch control away from<br>
> the radio's onboard microcontroller chip to the raspberry pi serial GPIOs,<br>
> program this option into the RDA1846 and then switch back control to the<br>
> radio. Pretty heavy work for something that might be possible in software by<br>
> programming the onboard controller (using CHIRP).<br>
><br>
> Any guidance very much appreciated.<br>
><br>
> Julian M1CWA<br>
><br>
<br>
</span>I don't know how CHIRP would do this unless the radio reads and writes<br>
this register to memory. If it does, and I doubt that is does, you<br>
would need to know which memory location this was.<br>
<br>
You might not that the schematic that you referenced was made<br>
available in early 2012. It is know to have many mistakes. There is<br>
nothing on it that shows that it was made by Baofeng. And these radios<br>
have gone through a few generations since then.<br>
<br>
You might contact Lior Elazary, KK6BWA. He is familiar with hacking<br>
the UV-5R and UV-B5.<br>
<br>
<a href="http://elazary.com/index.php?option=com_content&view=article&id=49:hacking-the-baofeng-uv5r&catid=14:baofeng-uv5r&Itemid=17" rel="noreferrer" target="_blank">elazary.com/index.php?option=com_content&view=article&id=49:hacking-the-baofeng-uv5r&catid=14:baofeng-uv5r&Itemid=17</a><br>
<br>
Jim KC9HI<br>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">~~~~~~~~~~~~~~~~<br>Julian Gough<br>Professor of Bioinformatics<br>University of Bristol<br>Department of Computer Science<br>Life Sciences building<br>24 Tyndall Ave, Bristol, UK, BS8 1TQ<br>Tel: +44 (0)117 3941211<br>Web: <a href="http://bioinformatics.bris.ac.uk" target="_blank">http://bioinformatics.bris.ac.uk</a></div>
</div>