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Ron / WB3ILX

Ron,
. .? Could you give a quick explanation?? As, is there a TCP interconnectivity, or, they can run at the same time independent of each other?? Thnx.

73. Rory W4RJG

All

I have validated that I am sending data by receiving on another radio using Minicom connected to it on the serial port.

Still interested to see if anybody has settings for ID-4100 to make sure I have set my radio correctly and also any VK3 hams wanting to test.

73's
DE VK3VDP
Melbourne, Australia

Hi All
Playing around in VK land here with D-Rats and the ID-4100. Have disabled GPS and also set to Auto TX and it keys the radio but are unsure that I am actually transmitting a valid message over RF through one of the local repeaters. All appears OK in D-Rats client but not much in the way of traffic here.

Just checking to see if anybody has the settings for the ID-4100 specifically. I've looked at other Icom radio versions and have set the radio per the ID-880 and also ID-51.

Best way I can think of testing this is probably set up my other D-Star radio on a simplex freq and just sniff the serial data coming out of it and look for my messages.

If anybody is in VK3 and wants to play D-RATES through VK3RWN, drop me a message.

73's

Darrin
DE VK3VDP
Melbourne, Australia

On 7/21/2022 1:28 PM, DigitalRadioGuy wrote:

I have a bunch of Kenwood commercial radios I was thinking of trying one of them.
None of the radios have any kind of flow control I can see, so, I
was wondering how file transfers worked without losing part of a file due to
buffer over runs. The function reference manuals say the max radio
buffer size is 1K, at least for the one NXDN radio.

I want to try this, but as of yet have not had time.

From what I understand, D-Star radios use the same GMSK digital encoding at the base level as other radios.

What D-Star does is have their own data frame format that is used.
To decode audio, you need the special chip.

So for d-rats, theoretically, for hardware, you just need a GMSK modem like for 9600 baud packet.

You also need to have software send the packet formats that d-star radios accept.

A Zumm Radio MMDVM can handle the GMSK modem part, and while it is designed to be plugged into a Raspberry PI, you can connect up a USB to serial module, or a TTL to RS-232 module and use any computer you want to use. I got one from the Dayton Hamvention to play with.

The same interface is probably used with other GMSK modems that target Arduinos, etc.

Again, I understand that there is software on the Raspberry PI, that knows how to talk to D-Star radios. Using that instead of rolling my own would be a big time saver.

Unfortunately, getting another Raspberry Pi to play with is going to take a while, as they will likely be sold out into 2023.

I was looking to see if a PI-zero could handle the job, so that I did not have to tie up my test Pi system.

And I do not know how hard it will be to have d-rats running on a Pi to communicate with the software that converts the data to d-star packets.

To have d-rats communicate directly with a GMSK modem, we should just need to port the code that communicates with the MMDVM UART to what ever platform that we are running d-rats on, possibly implementing that protocol in Python.

Again, I have not tried any of this yet, so the may be things that I am missing.

Unfortunately there is also a lack of documentation on how the MMDVM API works, when I ask, I just get pointed at the software projects that use it. So apparently reverse engineering the existing software is the only way to use these modems with out a Pi or the Ardunio they are targeting.

What I know so far is that it has some data signals on unknown pins and uses a standard UART for actual data transfer.

73,
-John

I have a bunch of Kenwood commercial radios I was thinking of trying one of them.

None of the radios have any kind of flow control I can see, so, I was wondering how file transfers worked without losing part of a file due to buffer over runs. The function reference manuals say the max radio buffer size is 1K, at least for the one NXDN radio.

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This is WB3ILX / Ron ,

If you all do a Zoom call, I'd love to be included.? ?To answer the original question "do net connections currently work?" ... The answer is YES, at least in verion daily-04172014.? I've not tried any version later than that.? ?This version can make TCP connections to DVAR Hot Spot (the very first D-Star Hot Spot software).? From there DVAR Hot Spot can turn a d-rats message into a DV stream and A) transmit it over the air via the connected (analog) hot spot radio, or B) send it to a remote repeater or reflector as if D-RATS had been connected to a real D-Star radio.??

I've also built a D-Rats/D-Star to Discord bridge that I'm guessing you all would love to see. :-)??

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Kenwood in DSTAR mode, and all other DSTAR radios, pass text traffic during one of the time slots in the signal … the D-RATS slot. Easy connect laptop directly to the data port (I use the RTSystems programming cable for the ID-51/Id-5100 … with my IC-91AD. It’s the orange cable.

I saw a brief message where someone said they were able to send data files using the Kenwood Transparent Data mode on a Kenwood commercial hand held radio.

Has anyone else done this and how was D-Rats setup for this?

Idea; let's do a zoom call around D-Rats for emcom and trade some ideas.

On Thu, Jul 21, 2022 at 07:44 AM, David Hubbell wrote:

I know in the past we used the mapping portion of D-RATS

I noticed that my map is blank. Do you have to import a custom map?

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d-rats.wa7dre.org port 9000 worked, thank you.

I'm volunteering a endurance running event (50k miles, 8000ft elevation climb, in the heat) and d-rats seems like a great solution.? I've used APRS, FlDIGI, JS8CALL, others.? ?This one is simple enough and I like that any tech can fire up a D-Star radio and create a local network with chat, files, etc. without too much configuration.? We shall see.

FWIW, I'm having the same issue.

Thanks for the question, Brian

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Nick, the DRATS signal is part of the transmission that includes voice.