[Not possible] Port to GD-73

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ON4PN
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[Not possible] Port to GD-73

Post by ON4PN » Sat Mar 21, 2020 9:00 pm

Hello,

The GD-73 is a small and handy DMR radio. Is there a change a kind of openGD73 could be developed for it ? Its monoband UHF radio. I fear it's hardware is to differend from the GD77 to use openDG-77 as a start for the openGD73 firmware ?


73 and 55's

ON4PN

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kd2lh
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Re: GD-73

Post by kd2lh » Sat Mar 21, 2020 9:30 pm

This radio (available as the Radioddity GD-73 as well as the TYT MD-430 (which includes a desk charger, which is not available from Radioddity) are likely the same radio. They both program with the same software.

These are made with a USB interface for both charging and programming. It is on the side of the radio with a standard mini-USB connector.

For OpenGD77, the big question will be, "what DMR processing chip does the radion use"? If it's the HR-C6000, a similar port may become possible depending on Roger's capacity to add another model. Note that adding additional target models to the code can add considerably to the complexity of building and distributing the firmware and CPS.

Anyone know what DMR processing chip is in these radios?

I found this page with internal photos, and will try and figure it out:

https://radioaficion.com/cms/md-430/

From an initial inspection of the photo it looks like it uses a HR-C7000 chip.

Unfortunately, documentation for the HR-Cx000 series of chips appears to be proprietary to the Chinese manufacturer(s). If it's implemented as a superset of the HR-C6000 there may be a chance for compatible operation with the firmware.

Here's an overview description of the chip:

https://communications.support/threads/ ... post117002

Sniffing around on the Internet, I found this description of the Hongrui Comm HR-C5000 chip:

https://www.qsl.net/dl4yhf/RT3/HR_C5000_english.html

This chip is used in the TYT MD-380 and the Retevis RT-3 radios (clones).

Found this on the HR-C6000:

https://raw.githubusercontent.com/roger ... slated.pdf

Still looking for anything that might hit on the C7000....
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kd2lh
Posts: 214
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HongRei Communications Re: GD-73

Post by kd2lh » Sat Mar 21, 2020 9:58 pm

in searching, I found a reference to patents held by HongRui Communications including their address and their association with Zhejiang University as well as relocation to Hangzhou.

https://patents.google.com/patent/CN102209378B/en

G4EML
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Re: GD-73

Post by G4EML » Sat Mar 21, 2020 10:25 pm

I believe that the HRC-7000 is a combined DMR baseband and processor chip. With the lack of available data programming that chip would be impossible.

VK3KYY
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Re: GD-73

Post by VK3KYY » Sat Mar 21, 2020 10:49 pm

I looked at this radio around a year ago, and inspected its firmware files, which do not seem to be encrypted.

But, the type of CPU inside the C7000 does not seem to be a standard type. i.e it does not appear to be an ARM or MIPS or any other processor type that Ghidra (the NSA hacking tool) supported.

So as well as there being no documentation for the C7000, its possible that they have implemented their own type of CPU for which there is no development toolchain.

So basically attempting to port to this radio is a non-starter

VK3KYY
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Re: [Not possible] Port to GD-73

Post by VK3KYY » Sat Mar 21, 2020 10:54 pm

BTW.
I have one of these radios, and it took ages for TYT to get it to work with Hotpots because of problems with the modulation.

Its only 2W, only has an internal, very small, antenna, and is actually designed for PMR in Europe, e.g. for families and children to use.

Its intended for serious use.

ON4PN
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Re: [Not possible] Port to GD-73

Post by ON4PN » Sun Mar 22, 2020 4:19 pm

Ok no problem.

Thanks anyway for your time , the main goal is the GD-77, so keep up your fine work !

Thanks !

73

Pat
ON4PN

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