Radio frequency

RE: Radio frequency

dougw — Tue, 30 Jul 2019 17:51:16 GMT

You could use something like LoRa to relay GPS location and send directions, but you would need to find some other way of sending video. As Shabaz suggested an LTE cellular link is about the only solution you could implement for a 100 km video link without enormous cost, complexity and licensing issues. If LTE is not always available you could use LoRa for the other data - you would still need a tall antenna (line of sight) for LoRa but at least if the video fails you can still have the ability to see location and send directions.

RE: Radio frequency

aswinvenu — Tue, 30 Jul 2019 16:30:39 GMT

Hi Oliver,

Can you check TI-CC1120 based solution?

TIDC-CC1120-LRM-868-915MHZ Sub-1GHz Wireless Long Range Reference Design with CC1120 (868 to 915 MHz) | TI.com

https://www.youtube.com/watch?v=wgqtEu5PfAw

RE: Radio frequency

olivercohen — Tue, 30 Jul 2019 13:43:04 GMT

VHF frequency

I am looking for a distance of 100km

I would like to transmit data video live streaming

150kpbs

from HQ to vehicle sending directions

From Vehicle to HQ video streaming.

RE: Radio frequency

olivercohen — Tue, 30 Jul 2019 13:36:18 GMT

Thanks for the info.

Air space not a problem.

It would be bidirectional going from the base HQ to the aerostat thru a repeater or some sort of extender then to the vehicle some distance away.

The Aerostat is in a fixed position 400m above the HQ.

Using antenna trackers to position and get the most frequency for a line of sight.

My question is instead of a repeater what can I use to communicate from HQ to the aerostat 400m above and still get maximum distance ?

RE: Radio frequency

aswinvenu — Tue, 30 Jul 2019 13:31:08 GMT

Hi Oliver,

It would be great if you can provide some more information about your application.

1) How far can the moving body go from the antenna?

2) What frequency spectrum are you talking about?

3) What kind of data you want to transmit and what is the required data rate ? (This can effect the frequency band selection)

There are restrictions on certain frequency bands in most of the countries. So check that first.

Regards,

Aswin

RE: Radio frequency

shabaz — Tue, 30 Jul 2019 12:45:05 GMT

Hi Oliver,

There's not enough information to answer fully (e.g. amount of information, and rate, and it's unclear if your communication needs to be bidirectional, and between which two locations - is the balloon acting as some intermediary between the fixed location and the vehicle?).

At the frequencies you may be allowed to transmit at, you'll have an ugly whip antenna sticking out the vehicle for 70cm or so. There are lots of online balloon projects, but they usually transmit just telemetry in one direction, from balloon to fixed or vehicle. That may give you some ideas for further designing of your solution. Bear in mind, it's not possible to have a balloon launch on demand (depends on weather conditions, and location/airspace), so it would be a very restricted solution for ground to vehicle comms if that was the intention.

1. My Goal in detail

(e.g. climb a mountain next year)

2. What things I'm trying to solve

(e.g. establish how high I am)

3. What constraints I have

(e.g. cost, software experience, hardware experience)