[Logo] Anarduino and HopeRF Community Forum
  [Search] Search   [Recent Topics] Recent Topics   [Hottest Topics] Hottest Topics     [Groups] Back to home page 
[Register] Register / 
[Login] Login 
LoRa – Long Range Line of Sight Tests  XML
Forum Index » Anarduino
Author Message
srnet



Joined: 09/04/2015 06:46:06
Messages: 1
Offline

To test the long distance capability of the new LoRa transceivers the HABAXE2 Pico balloon tracker was designed, it and the receiver used an RFM98.

Pico trackers are often launched using just a 36” foil party balloon filled with Helium. Filled to the correct level, they will rise to around 8000M and float along at that altitude. The radio horizon at that altitude is 370KM, so you can expect line of sight conditions to this distance. In the UK we normally use FSK RTTY to report back on the tracker positions.

HABAXE2 was launched in January 2015, from Caerphilly Common, near Cardiff, UK. The tracker was last heard of just short of the Mediterranean coast having travelled just over 1000km.

The tracker had software that allowed requests to be sent to the balloon tracker, via LoRa of course, such that it would respond with a series of packets at a particular mode.
The receiving antenna was a 6dB gain vertical, the tracker antenna a 1/4 wave vertical.

Some results of tests were;

BW500Khz, SF7, CR4:8 (13700bps) packets at 7dbm/5mW received at 105KM
BW41.7khz, SF12, CR4:5 (98bps) packets at 2dbm/3mW received at 242KM
BW41.7khz, SF8, CR4:5 (1042bps) packets at 10dBm/10mW received at 269KM.

To give a more practical guide, if a power of 10dBm/10mW was used with simple ¼ wave wire antennas at each end, the expected range would be;

BW500Khz, SF7, CR4:8 (13700bps) = 74KM
BW41.7khz, SF12, CR4:5 (98bps) = 303KM
BW41.7khz, SF8, CR4:5 (1042bps) = 135KM
tikiarya



Joined: 25/02/2015 13:31:24
Messages: 1
Offline

Priyasloka from India , LORA module user(Anarduino-LoRa RF96W 433Mhz). I am unable to get more than 1 km in city condition. Antennas are from terrace of building(around 20 meter). Could you share you ideas, arduino sketches/code, ideas how you are able to get very good range.
Thanks
Priyasloka Arya
stevech



Joined: 07/07/2014 18:07:27
Messages: 91
Offline

terrestrial RF path - buildings, trees unless from high rooftop to rooftop
vs
airborne platform RF path - line of sight, no obstructions

Yes?

1kM in terrestrial conditions is excellent with simple antennas, low elevation, ISM band

This message was edited 1 time. Last update was at 28/04/2015 11:16:53

 
Forum Index » Anarduino
Go to:   
Powered by JForum 2.1.9 © JForum Team