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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › TX/RX Latency Test Results
03-08-2013 01:04 AM  5 years agoPost 1481
JKos

rrProfessor

Redondo Beach, CA

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PJRono,
Nope, no 14SG yet. There are several newer radios I haven't gotten my hands on yet.

- John

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11-06-2013 07:04 AM  4 years agoPost 1482
JKos

rrProfessor

Redondo Beach, CA

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I would like to thank Chris (cmsilvoy) for sending me his Futaba T14SG and three receivers to test. Thank you!

It did quite well. Using 12 ch mode with the R7008SB receiver was the best. Telemetry with a 1 s update rate had practically no impact. Going to 0.1 s update rate did have a moderate impact.

I have updated the first three graphs in the very first post of this thread with the test results. I'll add it to the textual table tomorrow.

Thank you,
John

RR rules!

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11-06-2013 12:36 PM  4 years agoPost 1483
mpafonseca

rrApprentice

Savannah, GA - USA

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Hello John,

Thank you for keeping us posted and updated on your tests! Also do you plan to test the latest JR DMSS radios to compare with the Futaba Fast and Spektrum based radios?

Thank you again,

Marco

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11-06-2013 01:02 PM  4 years agoPost 1484
Four Stroker

rrElite Veteran

Atlanta

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Thanks John;

John is our one man consumer protection agency. He protects us against marketing managers and TEAM propaganda. As he has said, he will test anything that someone sends him. The 14SG (and presumably similar 18MZ) is extremely impressive. We have achieved the latency of 1970's AM radios at last. Many people kept their old FM radios for many years after PCM came out because they could FEEL THE LATENCY. They (most) finally gave in to the programability.

There are some holes ! DMSS, DX9, DX18, Jeti, ...

John, update your text chart.

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11-06-2013 06:40 PM  4 years agoPost 1485
JKos

rrProfessor

Redondo Beach, CA

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> As he has said, he will test anything that someone sends him.

Exactly.

> There are some holes ! DMSS, DX9, DX18, Jeti, ...

Yep, send 'em my way and I'll get them tested.

- John

RR rules!

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11-06-2013 10:56 PM  4 years agoPost 1486
hootowl

rrProfessor

Garnet Valley, Pa.

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If I'm reading the charts right, Futaba and Airtronics rules!

Wolves don't lose sleep over the opinions of sheep

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11-07-2013 12:59 PM  4 years agoPost 1487
Four Stroker

rrElite Veteran

Atlanta

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When your radio gets to the right side of John's chart, think about a new one from the left side.

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11-09-2013 06:35 PM  4 years agoPost 1488
raptorapture

rrApprentice

Singapore

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Great to see my latest radio acquisitions 14SG and 8FG are at the top of the latency race! I was languishing with my 9Z for a long time. Not sure I ever noticed any difference but I had put down the 9Z for quite a while before going FASST.

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11-13-2013 03:37 PM  4 years agoPost 1489
JKos

rrProfessor

Redondo Beach, CA

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I added Spektrum DX18 results.

- John

RR rules!

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01-28-2015 04:17 AM  3 years agoPost 1490
JKos

rrProfessor

Redondo Beach, CA

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A big thank you to Geoff_S for posting his Jeti DS16 latency results over on RCGroups at http://www.rcgroups.com/forums/showpost.php?p=29072629

- John

RR rules!

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01-28-2015 10:29 PM  3 years agoPost 1491
Andy from Sandy

rrElite Veteran

Bedfordshire, UK

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Having bumped to the top I notice the testing is in eCCPM mode.

I think most people will have gone back to H-1 mode to run with FBL controllers. Will this make none, some or a lot of difference to the latency to the rx output do you know?

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07-05-2015 11:11 PM  3 years agoPost 1492
readytofly

rrNovice

tuvalu

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hello guys,
can i imply from those numbers that futaba 8fg and 14fg, in average, have smaller latencies than any JR radio here tested?
it is always good to have the smallest latency? does, somehow, a big resolution make up for a big latency?
thanks.

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07-06-2015 01:15 PM  3 years agoPost 1493
rexxigpilot

rrProfessor

Florida

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Need testing on the latest gear to make any claim of one manufacturer being faster (having lower latency) than another. I'm sure the latest from JR with their own protocol called DMSS are about as fast as the latest from Futaba and Spektrum.

Most new radios today have latency so low that it cannot even be detected by a human pilot. Those who claim they can are delusional. It takes the human brain and senses longer to perceive a change in the environment than it takes the fastest RC radio systems to transmit, receive and process radio signals.

And no, resolution will not make up for a delay in radio transmission. Resolution can provide finer positioning of the servos, throttle signal or whatever is connected to the RX, provided the connected device has the same or better resolution.

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07-07-2015 01:47 AM  3 years agoPost 1494
Four Stroker

rrElite Veteran

Atlanta

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All of the JR on the list are ancient as said. Anything in the 20 ms range is fine. I am one of the delusional that claims I can tell the difference between 20 ms and 40 ms. That is the Futaba 12Z on 72 and 2.4

The human reflexes are very fast. Otherwise nobody could ever return a ping pong ball or hit a baseball. Your conscious reaction time to an unexpected event can be up to 1 second. This is why beginners are all over the place. This is about the latency of the very first proportional (analog) radios and the reeds before them.

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09-17-2015 03:39 PM  3 years agoPost 1495
joecarnine

rrNovice

Putrajaya - Malaysia

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I hope you can test VBar Control latency also...

Zul, Trex 550E, 600N. ALL 3G.

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09-17-2015 04:01 PM  3 years agoPost 1496
AirWolfRC

rrProfessor

42½ N, 83½ W

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For the record, the first "digital proportional" systems came out in the early 60's and had a frame rate of about 20ms. This allowed up to 8 channels and a frame sync. time. Those frames were not exactly 20ms. The frame time depended on the sum of all the individual channel pulse times plus the frame sync time.

The latency of those systems could be as little as 2ms and as much as 20ms. depending on where in the pulse train the stick was moved.

After that latency you still had the response time of the servos and then the response times of the air frame to control surface movement.

. . . and if your latency is 500ms or more, you should only be thinking landing gear, flaps or maybe a boat.

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09-17-2015 07:38 PM  3 years agoPost 1497
HilliHeli

rrVeteran

S.MI./FL.

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I have noticed that vbar (5.3.4 Pro for me) will show you latency options (if available) when you link your RX. (Sat.'s included) to your TX. in the set-up pages.

I believe that this is available with other fbl systems as well (?)

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

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09-17-2015 08:21 PM  3 years agoPost 1498
Four Stroker

rrElite Veteran

Atlanta

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AirWolfRC;

You have not flown an ANALOG proportional from the 60's ? I do not lie about the latency. ANALOG proportional is when the channels were different frequency audio tones that had to run through a filter. Followed by ANALOG servos where the position command was a voltage and not a pulse width. Early ANALOG proportional (all transistor) includes Orbit and Citizenship.

Digital Proportional (pwm) was a major innovation.

I suggested to John that he new compute the FBL systems latency.

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09-17-2015 10:20 PM  3 years agoPost 1499
AirWolfRC

rrProfessor

42½ N, 83½ W

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I started with a Kraft Seventy Eight series (from the 60's) using PWM.

I still have that unit.

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09-18-2015 01:50 AM  3 years agoPost 1500
Four Stroker

rrElite Veteran

Atlanta

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Post a picture of it ! I am reasonably sure Kraft skipped the analog proportional all together. But I remember metal open gimbals and Bonner sticks and linear servos in a metal can.

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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › TX/RX Latency Test Results
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