SMALL - Telemetry SMALL - Radio
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Old Dec 12, 2008, 05:05 PM
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RC TX & RX (not video)range test results for FPV.

Hello.
I this week i tested TX&RX.I have only know distance for FPV. Test results in the ground(not flight)

Conditions are as follows:
1.There must be a direct vision (not to be barriers).
2.Measured the distance to the ground.
3. Is measured accurately (driving under the speedometer)
4. Measure the first to link the loss or disruption
5.Measure the full connection to the disappearance (if possible)
6.Transmiter antenna and receiver antenna should not be closed no side effects.
7.Data write as follows:
a) transmitter model
b) The receiver model
c) The first disruption or disappearance of communication distance
d) Complete disappearance of communication distance


I think this is not end...
Distance (meter)
More results coming soon....
(Sorry from my english)

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Last edited by kestasxxx; Dec 12, 2008 at 05:20 PM.
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Old Dec 12, 2008, 05:10 PM
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I'd suggest you change the subject to include "R/C" e.g. "R/C TX & RX.... "
Otherwise people will come here looking for wireless video Tx/Rx range.

Was the testing done on flat ground, or with one end on top of a high point
somewhere? How high above the ground was Tx and Rx?
What's the difference between the two colored bars next to each combo?

ian
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Old Dec 12, 2008, 05:17 PM
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All TX&RX I tested in even reservation position.
Collor bars:
Complete disappearance of communication distance
The first disruption or disappearance of communication distance
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Old Dec 12, 2008, 06:16 PM
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Interesting!

Are the Spektrum radios you used the lower power European versions?

I wonder why the DX7/AR9000 combo didn't work as well as the 9303/AR9000 combo. I thought they had the same transmit power.
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Old Dec 12, 2008, 06:48 PM
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I'd love to see a Futaba FASST system in there.
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Old Dec 12, 2008, 07:07 PM
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Even the JR XP9303 72mHz version...
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Old Dec 12, 2008, 11:48 PM
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Quote:
Originally Posted by typicalaimster
I'd love to see a Futaba FASST system in there.
Me too!
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Old Dec 13, 2008, 12:39 AM
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Very Interesting data Kestasxxx. Thanks for doing the work and posting your results !!! It will help a lot of people asking questions about this.

JettPilot
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Old Dec 13, 2008, 12:56 AM
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Of course all these results can and will change, when you put a
high powered video Tx onboard the plane. Some R/C Rxs will
be overloaded by harmonics and just general high noise
floor produced by some video Txs. The effective range of my 2.4Ghz XPS Rx
with onboard 900Mhz Tx was zero, while FASST Rx is good
to at least a mile with stock antennas. Same relative placement
of video Tx and R/C Rx.
I've found similar results with various 72Mhz FM Rxs. Some are
very solid to over a mile near the video Tx. Some experience
front end overload and lockout at only a couple hundred yards
with the video tx, but work fine without it.

ian
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Old Dec 13, 2008, 09:11 AM
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Great stuff. I am using JR9303 2.4 + AR900 and almost lost my ship, at 1 KM (1000m) i had some glitches. I can tell by experience, the chart is very accurate when talking about the JR9303 2.4.
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Old Dec 15, 2008, 10:24 AM
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The 200m only of T4 started here real storm of protests.
Are you sure about the corectness of the test conditions ?
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Old Dec 21, 2008, 08:28 AM
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I would Love to see a Spektrum DX7 with (AR9100 4 Reciever set) test. what predicted range benifit would there be with a 8dbi patch antenna mod?

Brendan.
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