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Deviation output power 150mW = 100mW

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01 Jun 2016 11:55 - 01 Jun 2016 11:55 #49725 by HappyHarry
HappyHarry replied the topic: Deviation output power 150mW = 100mW
adding an antenna with gain will increase the eirp, and that's the power we need to be concerned with, unfortunately when using the 'cheap' inversionrc rfmeter the attenuator and antenna's used can make a huge difference in the readings provided
Last Edit: 01 Jun 2016 11:55 by HappyHarry.

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01 Jun 2016 12:28 - 02 Jun 2016 04:11 #49737 by Cereal_Killer
Cereal_Killer replied the topic: Deviation output power 150mW = 100mW

RoGuE_StreaK wrote: Though also of interest is in the internal photos, which unsolder the shield of the modules, both the 8s and 10 are shown with black modules?

My 10 has a black module, what's significant about that? (well it doesn't any more cause I only have a CC2500 in it, removed the stock module till I get a 4 in 1)

Taranis X9E | DEVO 10 | Devo U7E | Taranis Q7

What I do in real life: rivergoequestrian.com/
Last Edit: 02 Jun 2016 04:11 by Cereal_Killer.

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01 Jun 2016 23:08 #49786 by RoGuE_StreaK
RoGuE_StreaK replied the topic: Deviation output power 150mW = 100mW

Cereal_Killer wrote: My 10 has a black module, what's significant about that?

Just noting that we can't conclusively make a direct comparison between the models tested; supposedly the modules used for the 6/6s/8/8s/10/12/12s should have the same output, but there are some obvious minor physical differences displayed here. Also can't quite make out the printing, the module name is the same but seems the batch date is slightly different on the black ones?
Also significant in that all of the 8s modules I've seen for sale (well, NOT for sale now...) have been green. I know soldermask colour doesn't matter a damn to the circuit, it's just that there are obvious batch differences, which always brings to question whether there are associated differences in the circuit and coding required. If they changed soldermask colour, what else did they change?

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01 Sep 2016 18:29 #53383 by vlad_vy
vlad_vy replied the topic: Deviation output power 150mW = 100mW
Next run:

Devo 8s (original module)

Protocol Devo
150mW = 65.21mW = 18.00dBm
100mW = 37.28mW = 15.71dBm
30mW = 12.51mW = 10.97dBm
10mW = 3.27mW = 5.14dBm
3mW = 1.11mW = 0.45dBm
1mW = 285.8uW = -5.44dBm
300uW = 58.08uW = -12.36dBm
100uW = 16.29uW = -17.88dBm


Devo 8s (4in1 module)

Protocol Devo (CYRF6936)
150mW = 74.38mW =
100mW = 63.10mW =
30mW = 33.77mW =
10mW = 8.48mW =
3mW = 3.27mW =
1mW = 880uW =
300uW = 180uW =
100uW = 50uW =

Protocol Hubsan4 (A7105)
150mW = 79.43mW =
100mW = 79.43mW =
30mW = 76.86mW =
10mW = 53.53mW =
3mW = 20.21mW =
1mW = 6.52mW =
300uW = 3.61mW =
100uW = 1.63mW =

Protocol S-FHSS (CC2500)
150mW = 55.32mW =
100mW = 48.50mW =
30mW = 28.73mW =
10mW = 18.36mW =
3mW = 10.00mW =
1mW = 6.52mW =
300uW = 3.98mW =
100uW = 2.75mW =

I can't run test for nRF24L01 since I can't solder wire to MCU pin.

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02 Sep 2016 13:15 - 02 Sep 2016 13:29 #53410 by vlad_vy
vlad_vy replied the topic: Deviation output power 150mW = 100mW
With the help God, shit and other things I can solder wire to MCU pin. It's really almost over my possibilities.

Protocol SymaX (NRF24L01)
150mW = 79.43mW =
100mW = 79.43mW =
30mW = 76.86mW =
10mW = 63.10mW =
3mW = 63.10mW =
1mW = 20.21mW =
300uW = 20.21mW =
100uW = 20.21mW =

Some other NRF24L01 protocol difficult to test, power all the time greatly change. I don't know why.

For example, V202 for 150mW shows about 9-25mW. But with option 250 kbps = yes:

Protocol V202 (NRF24L01)
150mW = 79.43mW =
100mW = 79.43mW =
30mW = 79.43mW =
10mW = 65.21mW =
3mW = 65.21mW =
1mW = 20.21mW =
300uW = 20.21mW =
100uW = 20.21mW =
Last Edit: 02 Sep 2016 13:29 by vlad_vy.

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05 Sep 2016 10:00 #53491 by dc59
dc59 replied the topic: Deviation output power 150mW = 100mW
Fantastic test, thanks! :woohoo:

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10 Jun 2017 16:14 #62926 by Schugy
Schugy replied the topic: Deviation output power 150mW = 100mW

vlad_vy wrote: Next run:

Devo 8s (original module)

Protocol Devo

100mW = 37.28mW = 15.71dBm

Maybe this explains why failsafe kicks in on my RX601 in a Hype Interceptor II EDF jet.
I wonder whether jumping on 150mW really results in 65.21mW = 18.00dBm to stay on the legal side.
I could switch to a RX802 or RX701 with long antennas.
It's good to know that the Tx/Rx isn't generally inferior but the accuracy of the shown transmit power isn't sufficient.
Happy flying.

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10 Jun 2017 19:02 - 10 Jun 2017 19:02 #62927 by Moeder
Moeder replied the topic: Deviation output power 150mW = 100mW
Did you measure peak or average power? What type of attenuator did you use? Did you calibrate your measurement setup? Cables, connectors and bad measurement equipment do a hell lot of things on 2.4 GHz, so you could easily be off by 2-3 dB. You'd need a calibrated power source which you feed into you test setup and then calibrate you test setup for it before doing any measurements.
Last Edit: 10 Jun 2017 19:02 by Moeder.

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10 Jun 2017 23:51 - 10 Jun 2017 23:53 #62929 by MikefromGermany
MikefromGermany replied the topic: Deviation output power 150mW = 100mW
I use some different equipment (RF Explorer and signal generator plus quality 2GHz attenuator) for my power measurements, but got quite similar data with the Devo 8 modules.
All the range modded 7e modules I had my tests with were a lot more powerful after the 15k resistor had been bridged. Peak power between 170 up to 200mW maximum at 150mW settings.
Last Edit: 10 Jun 2017 23:53 by MikefromGermany.

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16 Jun 2017 14:53 - 16 Jun 2017 14:56 #63022 by denis747
denis747 replied the topic: Deviation output power 150mW = 100mW
So does this mean that the range test 100 µW power in Deviation is actually lower than the real 100 µW and this explains the modest DSMX range test results? I am getting 30 to 32 paces in range test mode on my white Devo 10 using stock module with DSMX.

Some people with Spektrum transmitters say they get up to 50 paces in range test mode.
Last Edit: 16 Jun 2017 14:56 by denis747.

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16 Jun 2017 16:52 #63023 by Fernandez
Fernandez replied the topic: Deviation output power 150mW = 100mW
Frsky D, protocol when using range check or 100uW, the range and output power of deviation is still far too high for proper range check.
The stock Frsky Tx module in range check I have no detection on my Rf detector (diode, with meter) , with deviation I have still quite some power on the meter.

also I reach long distance in range check, Frsky D-Series Far walk....

(Not tested for other series) I use cc2500 module, not 3:1 4:1

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