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The LILYGO TTGO T-beam devices don't use Part 97 frequencies.. they use Part 15 that don't have the same requirements: https://meshtastic.org/docs/hardware/tbeam-hardware --David KI6ZHD

And, there's another point: Lora, last I heard, is a proprietary format and needs a patent license. So at least in the US, there is no possibility of a Free Software SDR implementation, even if one

I don't think this is going to work as these two solutions are "competitors" if you will and they are effectively doing the same thing. This T-beam device is acting as a KISS TNC interfacing to the

I found an interesting side project to interface with DW.? LoRa APRS using a TTGO T-Beam.? The project is here: https://githubplus.com/SQ9MDD/TTGO-T-Beam-LoRa-APRS I have a couple 70cm T-Beams.?

I certainly do not want to use this as a D-STAR interface. -- Levente Kovacs Senior Electronic Engineer W: http://levente.logonex.eu

On Fri, Dec 3, 2021, 07:26 John D. Hays <john@...> wrote: > > The other issue with transformers is some modulations such as GMSK also > need very low frequencies as well. For example D-STAR. > >

On Fri, Dec 3, 2021, 07:26 John D. Hays <john@...> wrote: > > The other issue with transformers is some modulations such as GMSK also > need very low frequencies as well. For example D-STAR. > >

The other issue with transformers is some modulations such as GMSK also need very low frequencies as well. For example D-STAR.

Hi, I didn't know about that particular pinout. I don't wish to redesign the circuit, but to be honest there's nothing against it. :-) I updated the

Does it follow any particular pinout (like the common KPC-3 pin assignments)? Also, does it have Vin on one of the pins to power it and the Pi though that connector? 1-TXAudio (to radio), 2-CD, 3-PTT,

Hi David, Please find my answers below. You can open the design files with KiCad, but I can post a PDF no problem. The transformer has its upper frequency limit of 4kHz. Yes. The DB9 is for

You are right, it is missing from the documentation. You have to supply your own soundcard. I use cheap USB soundcards, and they work well. Only one channel is used with the sound card. The audio

You mention audio transformers, but don't mention anything about audio input (sound card).? What are the transformers connected to?? Or does the user have to supply their own sound card? Is the

Hello Levente, Thank you for the post and this looks pretty interesting. I'm curious if you could post a PDF of the schematics of the board and maybe a BOM parts list? It might be nice to annotate

Hello Tadd, I would generally agree but that's not what the person wanted. He wants to use an Apple //e as a serial terminal into something that emulates a TNC. There are lots of Linux-native and

Hi, I've just put together a raspberry PI hat. It contains a power supply, inductive audio couplers, cooling fan and a GPS module. It is not yet

I don’t think we need the cmd: prompt, but using it in a KPC-3 kind-of way would call for a command interface to: specify connect path, initiate connections, disconnections, and then a display

Hello Elgunn, This feature has been requested for Direwolf a few times in the past. I suppose that Direwolf could add native support such a thing some day but it's a bit of a backwards step. If or

Oh, yeah. Used them many, many times. Also the 35's. Mechanical marvels, both. They'd be a bit harder to use in this situation, being current loop interfaces (vs RS-232), but should work

MAI Jolt) and TV Typewriter how about a Teletype Model 33? This thing at 100 wpm was a screamer for the days. Mike K6MFW