Orsum info.
Thanks & 73's VU3SXT.
On 02/09/2011, Yannick (XV4Y) <yannick.devos@online.fr> wrote:
> Yes, thanks a lot for sharing the information.
>
> 73,
> Yan.
> ---
> Yannick DEVOS - XV4Y
> http://xv4y.radioclub.asia/
> http://varc.radioclub.asia
>
> Le 2 sept. 2011 à 14:55, Raj a écrit :
>
>>
>>
>> Very interesting Aravind, thanks & 73 Raj vu2zap
>>
>>
>>
>>> <90c507f.jpg>
>>>
>>>
>>> It wouldn't be easy by any means, but not entirely impossible. There's a
>>> number of groups that try to pry into a devices internals and write
>>> custom firmware. For example, one person converted a $16 "IM ME" toy into
>>> a spectrum analyser.
>>> http://ossmann.blogspot.com/2010/03/16-pocket-spectrum-analyzer.html
>>> That device is interesting once you get into it. It uses chip that can
>>> tx/rx on 281 - 361, 378 - 481, and 749 - 962 MHz.
>>>
>>> The UV-3R is actually a SDR (software-defined radio). The main chip is an
>>> RDA 1846 and is amazing. It is a little 5mm x 5mm package that you can
>>> hook power, microphone, speaker, and antenna to it and you have a basic
>>> radio. A bit of software sends signals telling the 1846 what frequency to
>>> tx/rx on and any PL tones. I have actually requested a sample of these
>>> chips from RDA and I am going to try to make a PC controlled SDR from
>>> it. BTW - the chip itself is tri-band: 2m, 1.25m, and 70cm. So the UV-3R
>>> is physically capable (but software limited) of being a triband radio.
>>>
>>> On the UV-3R, this software is placed into a MC81F8816Q (
>>> http://www.abov.co.kr/data/manual/MC81F8816.pdf). With the right
>>> hardware, someone could pull the code out of it and take a peak. They
>>> could also put their own code into it. Granted, the code you pull out is
>>> going to be machine code, whereas most programmers will do their coding
>>> in a higher level and have it converted. So it's theoretically possible
>>> to write your own code for this microcontroller and flash it.
>>>
>>> The tricky part is getting a connection to the chip. If we are really,
>>> really lucky, the programming cable we use to write the memory can be
>>> used to update the flash firmware as well. However, from some other
>>> posts, Baofeng has commented that no firmware updates would be made
>>> available for this radio. The other method is to find the relevant pins
>>> and make a connector (involves surface mount soldering) similar to how
>>> some router hackers will add a JTAG connector. Take a look at pages 139
>>> and 141 in the PDF I linked.
>>>
>>> That being said, it's probably not going to happen. More likely, another
>>> version of this radio or a kit radio based on this chip will come out.
>>> Perhaps one of the SDR projects will pick up the chip as part of an open
>>> source project. I know I hope to make a radio out of the 1846 chip, but I
>>> won't be experimenting with the UV-3R itself. My vision is a little grey
>>> box with a usb hub, a usb sound card, and a usb "serial port" inside it,
>>> alongside the 1846 chip. I would add an antenna connection and some
>>> audio (mic/headphones) connections. Then you would have this completely
>>> computer controlled radio with tri-band capabilities.
>>>
>>>
>>> On Thu, Sep 1, 2011 at 10:09 AM, Lynn W. Deffenbaugh (Mr)
>>> <ldeffenb@homeside.to> wrote:
>>>
>>>
>>> You mean you really expect someone to be able to reprogram the firmware
>>> in the radio itself to drive the internal display differently than
>>> provided by the manufacturer? I'd LOVE to have that capability on my
>>> D700, but I've never seen it on any radio. That's an entirely different
>>> level of programming that 99% of the programmers out there have ever
>>> encountered.
>>>
>>> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
>>>
>>> PS. Firmware for the Tracker2 family TNCs are open source, but that's
>>> the closest I've seen to what I think you're requesting. And there's a
>>> pretty big gap between programming a TNC and programming a radio.
>>>
>>>
>>> On 9/1/2011 9:50 AM, Russell J.P. Hules wrote:
>>>>
>>>> Hello group,
>>>>
>>>> Has anyone in the programming realm written code to give an alpha
>>>> display rather than a frequency?
>>>>
>>>> 73s de Russ/KC5CNT
>>>
>>> __
>>>
>>>
>>
>>
>>
>
>
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