LoRa Walkie Talkie?

Projects General Guidance
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when I was a kld we called this a Dick Tracy wrist radio. It's right up there with flying cars in the "if you know enough to think it through you stop thinking about it in one minute" category.

U.S. FCC regulatory domain: LoRa is about sending 64 bit packets. total on air time in one day: 30 seconds

antennas: optimum transfer of RF energy to air requires a half wave antenna. LoRa in the US uses the 23 CM band. half wave = 12.5 CM =5" = a 2.5" ground plane and a 2.5" radiator. if that is all gibberish, consider getting an amateur radio license before you start experimenting with radio. another money sucking technical pastime. there are so many 7 year old hams it is no longer newsworthy.

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Hint: have you looked around to see if you can buy such a set?

23

Hi,
To realise a communicator watch, you have a Bluetooth watch connected to the smartphone in your top pocket.

Google;

bluetooth communicator watch

If it could be done the way you envisage with todays technology, it would have been done by now.

Tom... :smiley: :+1: :coffee: :australia:

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I thought of that. But how would that work? And I was worried about always having to have a WiFi connection in order to use them.

25

Just one suggestion. You might need portable WiFi cells.

26

I thought of that also, but I don't want every person using the watch to have
to have a smartphone.

27

Oh yeah. You mean like the cellular WiFi hotspots? But then I might as well just skip the WiFi part and use SIM7600, but then its just phone calls; not so much a walkie talkie. That was my thought process :person_shrugging:

28

But it is ok for everyone with your watch to hear and participate in all conversations?

29

Yes.

30

Without a long-range antenna or short-range relay like cell or WiFi, you are likely out of options.

I suggest reinvestigation some or all of those choices with an open mind.

It's certainly not an impossible project.

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31

I did look it up on Amazon. But I want to try to make them to enter in a contest.

32

And your plan to avoid everyone talking at the same time is:

33

I figured one person would press a PTT button, speak, and then release it. Then the next person can do the same. You could also address the correct person when you speak (such as "Hey Bob"), that way they know who youre speaking to.

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I'll take a look at WiFi walkie talkies and see where I get. It sounds like the most viable option right now.

35

I'm also new to radio stuff (I only have a bad experience with NRF24L01), which definitely doesnt help. Just to clarify, LoRa frequency range is 915mHz in North America, right? And what's the difference between "LoRa" and "radio" modules?

Edit: I found this: Wi-Fi Walkie Talkies! - Hackster.io

36

I just realized that I already own several Retevis RT6 Walkie Talkies. They can operate at up to 5W. How on earth do they do that? Could I just make the same exact thing, but much smaller? I don't mind that antenna size; i.e. I can make do with it.

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I suspect you are just fantasizing. In any case, this is not an Arduino problem.

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Wdym?

Yes it is. I am using an Arduino as the main board. If the Nano ends up being too big, then ill probably use a Atmega with the Arduino Bootloader. I mean, technically the radio questions isn't "Arduino" related

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They do it by having a battery that is capable of providing the more than 5W of power for them to operate.
You need to understand how radio waves and signal processing in a transceiver work?

Tom.... :smiley: :+1: :coffee: :australia:

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1 Like