Yes, thanks a lot for sharing the information.
73,
Yan.
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Yannick DEVOS - XV4Y
http://xv4y.radioclub.asia/
http://varc.radioclub.asia
Le 2 sept. 2011 à 14:55, Raj a écrit :
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> Very interesting Aravind, thanks & 73 Raj vu2zap
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>> <90c507f.jpg>
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>> 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.
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>> 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.
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>> 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.
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>> 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.
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>> 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.
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>> On Thu, Sep 1, 2011 at 10:09 AM, Lynn W. Deffenbaugh (Mr) <ldeffenb@homeside.to> wrote:
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>> 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.
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>> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
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>> 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.
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>> On 9/1/2011 9:50 AM, Russell J.P. Hules wrote:
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>>> Hello group,
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>>> Has anyone in the programming realm written code to give an alpha display rather than a frequency?
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>>> 73s de Russ/KC5CNT
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