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HelicopterRadio - Servo - Gyro - Gov - Batt › TX/RX Latency Test Results
12-06-2017 11:37 AM  10 days agoPost 1521
Richardmid1

rrProfessor

Leeds, England

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Man I remember flying a friends Hitec Aurora 9 AND an old style Vbar set to fully 'robotic' style! Jeez i've no idea how he flew that thing! Talk about being disconnected from the model! The latency explains why!

People bang on about human reaction times being way higher than the latency in the radios but you are not reacting to something, you are moving your fingers! It doesn't take you 0.5-1.0 seconds to start moving your fingers from your brain telling them to move! In our case of flying helis the human latency is from moving your fingers to your eyes seeing the heli move which is WAAAY quicker (almost instantaneous) than if you were simply reacting to an outside stimulant.

60% of the time, it works every time!

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12-06-2017 07:41 PM  10 days agoPost 1522
Four Stroker

rrElite Veteran

Atlanta

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There are two neural paths from your eyeballs to your brain. One goes back to your visual cortex where you have to think about what is happening and then think about your response. This is the 250 ms to 1 sec path. The other path goes directly to your primitive brain stem and is responsible for reflexes. When you are learning how to fly the slow path is used. After you know how to fly the fast path is used. It was extensively argued how fast is fast enough ? This depends on the person. For me it is about 20 ms. But I know people with a hell of a lot faster reflexes than I have.

Ancient AM/FM systems had an average latency of 1/2 the frame time. The frames were about 20 ms. The max. latency was the frame time. I skipped over PCM 512 because the latency was ridiculous. As John shows, PCM 1024 was not great either. John gets credit with embarrassing RC companies to reduce the latency. There was some German testing as well.

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12-06-2017 08:26 PM  10 days agoPost 1523
AirWolfRC

rrProfessor

42½ N, 83½ W

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It's a shame that companies have to be shamed and embarrassed before they fix their product. Why don't they just do it right in the first place instead of pushing a product on the market and make known false claims just to generate revenue ? One company in particular I have pointed out a few "mis-steps". They even tried to bribe me with a free transmitter. I told them No, I'd rather see them fix their problems.

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12-06-2017 10:51 PM  10 days agoPost 1524
Heliguychris

rrKey Veteran

Perth, West Australia

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Sorry i couldnt find it in the few pages of this thread i looked through-

How was the results of the 18mz and 7008?

Is it pretty much the same as 14sg?

Thanks.

Licensed (CASA) UAV operator certificate holder 1-YFOF5-01 www.helicamaerial.com.au

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12-06-2017 11:58 PM  10 days agoPost 1525
Pistol Pete

rrProfessor

Seffner, FL

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All results on first post.

18mz not on the list but 14mz is with ar9000 Rx
20 min to 76 max with 47 avg (ms)

~~Enjoying the hobby one flight at a time~~

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12-07-2017 11:23 AM  9 days agoPost 1526
Heliguychris

rrKey Veteran

Perth, West Australia

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Hi there Pistol Pete, thanks for your reply.

Seems strange that the 18mz hasnt been tested.

You do know dont you that a AR9000is a spectrum receiver, whilst a14MZ is Futaba ? Typo iassume.

Kind regards.

Licensed (CASA) UAV operator certificate holder 1-YFOF5-01 www.helicamaerial.com.au

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12-07-2017 11:48 AM  9 days agoPost 1527
Richardmid1

rrProfessor

Leeds, England

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How did the old Spektrum DX7se beat all the later Spektrum models??

60% of the time, it works every time!

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12-07-2017 12:23 PM  9 days agoPost 1528
HilliHeli

rrVeteran

S.MI./FL.

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I remember the DX7se being the first to offer 11ms latency @ 1024res. with DSM2.
There was no-port for a trainer connection.
I was ready to purchase one of these models but waited for the DX8.

!Antriebe, die bewegen!
Henseleit-Helicopters.de
Jazz', Jives & vbar's
Futaba FASST / FASSTest

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12-07-2017 01:33 PM  9 days agoPost 1529
Pistol Pete

rrProfessor

Seffner, FL

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AR9000....most likely mislabeled. It was the first one on list under 2.4

Going further down the list under PPM you will find

Futaba 14MZ |R5014DPS|14 | 14| 31.5| 31.5| 22.75 (1)
Futaba 14MZ |R5014DPS|14 | 24| 31.5| 41.5| 27.75 (2)
Futaba 14MZ |PCM1024 |29 | 93| 42 |106 | 67.5 (3)

All times are in milliseconds.
MLF - Minimum latency to first change at receivers output
MLL - Minimum latency to last change at receivers output
MaxLF - Maximum latency to first change at receivers output
MaxLL - Maximum latency to last change at receivers output
Avg - Average of MLF, MLL, MaxLF, and MaxLL
Seems strange that the 18mz hasnt been tested.
He tested what was sent to him by RR members. I dont think manufacturers were volunteering anything.

~~Enjoying the hobby one flight at a time~~

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12-07-2017 01:52 PM  9 days agoPost 1530
Four Stroker

rrElite Veteran

Atlanta

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As you can see at the top of the first post, John has not done any of this in a long time. There are two reasons. 1) Everyone uses FBL now and this is really an eCCPM latency test. 2) Most modern transmitters are better with built in RF decks. Many of these old transmitters had afterthought modules.

Beware that the frame time quoted in marketing is not the latency.

And finally if you want to see latency find an old analog system (and I don't mean AM/FM "digital" from the 70's) which had a latency of approaching 1 second. See: http://www.rchalloffame.org

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HelicopterRadio - Servo - Gyro - Gov - Batt › TX/RX Latency Test Results
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