OpenLRS range testing.

by rchacker | April 24, 2013 | (9) Posted in Reviews

http://www.youtube.com/watch?v=dhtvLhPBYfU

Testing the OpenLRS UHF system. More specifically testing the openLRSng firmware with two receiver modules. One is programmed as a transmitter with leds, a switch and speaker added.

The stock rubber ducky antennas are used for the test. No doubt better range could be had with different antennas.

More info here: https://github.com/kh4/openLRSng

and here: http://www.flytron.com/openlrs/146-openlrs-receiver-v2.html

COMMENTS

windfou on April 24, 2013
thanks for sahring ! so what is better? open lrs or the 2.4 booster?
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rchacker on April 24, 2013
Very hard to compare.
Out of the box, ease of use, FrSky.
Price, and hackability. OpenLRS.
Absolute range in open air? It would only be fair too add the 7W booster (from flytron) to the OpenLRS system. Also make good antennas for each. Then you would have a stupid amount of range (20km+) for both systems, more than anyone would ever need.
Both are excellent and judging from other reviews, of other products etc. I would say the best in their classes.
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windfou on April 24, 2013
i already have frysky module and a turnigy 9xr but the booster i ordered from china never work and its the same as you maybe i will have better luck next time so do you think i can fly 500m in the wood below the tree with the booster?
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rchacker on April 24, 2013
Hard to say, depends on the density of the trees. Here I would not get 500m.
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windfou on April 24, 2013
of what I read low frequency penetrate better and lrs is the one am talking but anyway
for now am doing not so far fpv i will keep my gear for now
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Nonamerc on April 25, 2013
Hi try this antenna
It's the best antenna you can use for UHF:
http://team-blacksheep.com/products/product:42
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tramsgar on April 30, 2013
For both ends, I assume?
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nope on May 1, 2013
Nope.
Plus, it's not a very good recommendation. It's not the best antenna, and if you were to use it, don't use it for both ends.

First, you can find this antenna, original for less than $10 on ebay. Same for the Nagoya.

Second, a dipole is a better antenna. A dipole should also be used on the receiving end (regardless of the transmitter antenna), or a turnstile if you want better polarization.

Dipoles are cheap, (very) easy to make, and provide the best all around performance (its significantly better than the nagoya/diamond actually).
Yep they look a little odd on the transmitter, but they're better for range and even polarization. (turnstile is even better for polarization, but expensive/hard to make, and doesn't provide as much range)

You can find more information on how to make dipoles here: http://fpvlab.com/forums/showthread.php?3156-433MHz-Half-wave-dipole-for-LRS

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Jake Wells on April 26, 2013
5 again.
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OpenLRS range testing.