Hello Guys

I use rfd900 modems with good results.

Sometimes need to fly in mountains and hill zones, and frequently loss link due LOS issues.

Is there a relative low cost solution for a Satellite link? i mean for low bandwidth telemetry, no video

best regards

Nicolas

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I doubt such TX exists. receiving satellite signal is easy, however tranmisting drone signal back to ground station via a sataliite uplink would requires you to;

1. A very powerful transmitter. Remember the old Motorola satellite phone with huge antennas.
2. The satellite frequency spectrum is not available to public domain.
3. Power and weight issues.

Dragon link V3 looks promising, however always sold out.

If you are tinker like me and have electronics background and the area where you fly happens to have wireless cell coverage than there is one possible solution but would require some serious tinkering.

Send telemetry signal via. Cell modem back to ground station over 3G or LTE.

I recall seeing a commercial company that develops ultra long haul telemetry systems for commercial applications however, I think in US you need a license to use such high power radios. Do some googling you may find that company.

I bought RDx modem just recently but have not used it yet. What type range are you getting out of them?
One option would be to check www.Uavionix.com web site they have a commercial grade transponder for UAV's. So your drone will ping like a real aircraft. You would need a real aircraft flight monitoring solution to see where your drone is in the sky.

Not exactly telemetry but you can track your drone like a real airplane.

Iridium

Yeah! Some serious tinkering would be required but should work.


Strip it down to bare basics, remove key pad, case, screen to reduce weight. I am not sure what kind of battery it uses. Plus have to build an interface from scratch to transmit co-ordinates. A lot of design work will be required.

One phone sells for $1200 dollars. He will need two plus, service plan, and all the tinkering.

I would further explore the UAvionix transponder option.
Gary Mortimer said:

Iridium

May be we can use this satellite for UAV's lol :)

https://www.thevintagenews.com/2016/10/31/abandoned-in-space-in-196...

Here is the solution  http://www.rock7mobile.com/products-rockblock-9603

We only need Tridge to implement the " lightweight " mavlink, were we can select only specific messages to be sent/received at long intervals, and only when the main telemetry link is down. 

Thanks for sharing. Interesting product for sure. I am looking into it now.

1. I guess we first need to figure out what is short burst message full duplex really means in their product. hat could limit us.
2. there is an on going monthly charge to use it. I see more of commercial solution but it looks good to me.
3. We can always build a MavLink translator for this device.

have you ever personally tested it?


naish said:

Here is the solution  http://www.rock7mobile.com/products-rockblock-9603

We only need Tridge to implement the " lightweight " mavlink, were we can select only specific messages to be sent/received at long intervals, and only when the main telemetry link is down. 

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