How to make cominication with two arduino with satellite network?

Projects General Guidance
1

The last earthquake that happened here in turkey, I couldn't cominicate with my family at all, because of gsm outage.

I live 50km away from my family, in the other side of the city.

I'm trying to make two devices that can communicate with each others.

There is a lot of buildings, and I can't put antenna on the building "If I want to use ham radio for example" also require a license.

Lora can't go that far either, so the only way gonna be throw satellite.

Is there any cheap way to use satellite network without paying thousands of dollars :thinking:?

or any other ideas!

I just want to send a msg like "I'm still alive"
or "help"

Even if it's morse code it's okay for me

2

I don't think that direct satellite communication between two Arduinos is possible at the moment.

Satellite modems like the RockBlock are not expensive and are easy to use, but the messages sent by an Arduino end up on a web page, or perhaps can be sent to an email address.

3

Hmm it cost 1200 usd here..
There is a huge tax on it, I checked Satalite phones, it cost around 2000 usd for one device, and 500 usd per year.

With that price, I will lunch my own balloon :balloon: and make it a satalite..

4

Well you have discounted all the normal ways of sending such messages as too expensive or not being 'allowed'.

A 36" party balloon filled with helium, would certainly be cabable of doing the job, if all you want is 'morse code' type comms, but I suspect you were not serious about doing it that way.

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5

I've aspired for years to launch my own balloon and transform it into a personal communication station, equipped with additional solar panels fans to enable it to remain stationary.

However, the issue is that this endeavor is entirely illegal without university affiliation and the necessary licenses. Additionally, I wouldn't be permitted to operate it for more than an hour.

Should it become legal, I assure you that even if it costs me $20,000 USD, I would not hesitate to pursue it.

6

Is GSM or similar communications legal in Turkey?

7

yes it's legal, but in the last earthquake, GSM was no available at all for the whole day

8

I think it is quite safe to say that a communications system that works reliably over a distance of 50 km and is fully self-reliant (continues to work when the power is out) and independent from external services (such as GSM or wired phone/internet connections) is going to cost you a lot.

Satellite phone is I think the most commonly used civilian solution for this problem. The military likely has their own solutions, which likely cost even more.

10

Or maybe lorawan network?
On the things network, It's hit or miss on this one

11

In the last earthquake, GSM network was completely off, the earthquake hit major towers, also there was a peak in communications, all people was trying to call at the same time, towers have limitations.

I guess if I send a msg over a ham radio in my situation nobody gonna say anything! it's emergency?

13

The problem is: I'm foreigner :grin:
So I have to learn Turkish first to take the test.

If it was in English, I will take it right away

14

So take the test in your home country.

A lot of places have reciprocal rights for 'foriegn' hams.

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15

You need the Internet running for that, so if the internet is running .............

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16

I guess to take the test in my own country is a really good suggestion :ok_hand:t2: I will look for that.

I just deployed 10 sensors all over the city to detect P-Wave

All devices send the data to a server.

When a device detect a shake it will look for other devices, if there is a match in frame time it will deploy an alarm to all my family phones.

No false alarms if someone hit a device by accident.

20240203_131758
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20240203_131805
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20240203_131745
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Now I just need away for my family to send SOS msg when they are in danger or trapped :pensive:

I detected P-Wave 400km away.
here you can see it 6 devices detected it

20240203_135347
20240203_1353471844×4000 1.26 MB

not that clear :thinking: I have to work more on the graph code to separate each device graph more

17

So true. However, the OP will need a licensed individual on both ends of the communications. If Turkey does not have the equivalent license class to the one the OP gets, then there is no reciprocal rights.

18

:thinking: I just completely forgot about that...
What if I used my license to send these msgs back! with my call name! I have no idea if that is legal

19

That would be "broadcasting" and is not legal. Ham radio is designed for communications, not broadcasting. Besides, what would be the point if you cannot get confirmation that your message was received and understood?

1 Like
20

Is there an equivalent to Citizen Band Radio in Turkey?

21

It's getting complicated :confused:

I guess satalite are the only reliable option.

but expensive, I guess I'm gonna buy one for me and one for my mother, and ignore the rest of my family members..

22

I didn't get your question, sorry!