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48 pages [ <<    <     4      5     ( 6 )     7      8     NEXT    >> ]70186 viewsPOST REPLY
MRC/Altech Marketing USA . Ace Hobby . JR-Spektrum

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Radio - Servo - Gyro - Gov - Batt > TX/RX eCCPM Latency Test Results
 
 
JKos
Elite Veteran
Location: Town of California in the state of Maryland

John,
The front end of the DX6 is decently fast at 13 ms, so I can't imagine the 6102 could be much better. There isn't much room left to be any better. Even if the 6102 matches the numbers for the 8102 and 10X, that is only 3 ms better than the DX6.

There is more to it than just the latency, however. Even the feel of the radio is going to change your overall perception of the flying experience.

= John

Protos -- Logo 14 -- Logo 10
09-18-2006 Over year old.
 
 
JKos
Elite Veteran
Location: Town of California in the state of Maryland

I've updated the chart with the numbers for the new Spektrum DX7. This radio kicks butt! It is as fast as the Stylus, 12Z, and 14MZ!

- John

Protos -- Logo 14 -- Logo 10
10-20-2006 Over year old.
 
 
w.pasman
Elite Veteran
Location: Netherlands

Thanks for the update!

Maybe it is an idea to measure the stick deadband as well, because some people reported issues with that concerning the spectrum 6000 receiver, and I remember that some other radios had a little deadband as well

Some info on that dx7 deadband in this thread
dx7
10-20-2006 Over year old.
HOMEPAGE  
 
 
stanc
Veteran
Location: Conroe, TX

I use the Spektrum in a eRaptor 50 and a Xero G, both with eCCPM and trust me there is no deadband. Maybe who ever is saying this has expo dialed in. The only thing different with mine from some other guys is I have the DX6 TX board in a 6102.





Stanc
10-21-2006 Over year old.
 
 
w.pasman
Elite Veteran
Location: Netherlands

Please read the thread and the comments of greg and heli_headcase. I dont see reasons to disbelieve their test results. Expo should not cause deadband. But discussions about deadband of that particular Tx should be probably put in that thread.

I am just suggesting John to add deadband measurements.
10-21-2006 Over year old.
HOMEPAGE  
 
 
nap_tan
Senior Heliman
Location: Santa Clara CA, USA

"I've updated the chart with the numbers for the new Spektrum DX7. This radio kicks butt! It is as fast as the Stylus, 12Z, and 14MZ!"

John, I just looked at your chart and saw the values for the DX7 that seem to be no where near the top 3? Am I reading the chart wrong?
10-21-2006 Over year old.
 
 
Micro-Maniac
Elite Veteran
Location: Pasco,Washington Formerly: Captain Chaos

Alphabetical.. Lowest numbers = Fastest.
10-21-2006 Over year old.
 
 
JKos
Elite Veteran
Location: Town of California in the state of Maryland

> Alphabetical.. Lowest numbers = Fastest.

Bingo. The list is in alphabetical order. The lower the latency, the better.

> But discussions about deadband of that particular Tx should be
> probably put in that thread.

Yes, please keep any discussion particular to the DX6 "issue" in appropriate threads.

- John

Protos -- Logo 14 -- Logo 10
10-22-2006 Over year old.
 
 
nap_tan
Senior Heliman
Location: Santa Clara CA, USA

I was apparently looking at the AR6000
10-22-2006 Over year old.
 
 
tch_popeye
Heliman
Location: Guelph, Ontario

Wow - no activity in this awesome thread for a few months!?

JKos, thanks for the hard work.

Can you answer another question? I am trying to make a radio purchase decision, and am currently stuck between 2. However, the thing that strikes me is I do not use any of these receivers in my park flyer-size planks or heli. Do you have any idea what sort of latency is induced by 3rd party Rxs such as the Berg Microstamp 4L or 7, or FMA Direct M5?

My concern is that I've purchased a whole bunch of Rxs without ever considering how much latency they may add to the system. A look through your charts shows that the Rx can add 20 to 45 ms! I'll wager that some of the inexpensive stuff I own is even worse.

Thanks again,

-Trev


01-16-2007 Over year old.
 
 
JKos
Elite Veteran
Location: Town of California in the state of Maryland

Trev,
> Do you have any idea what sort of latency is induced by 3rd party
> Rxs such as the Berg Microstamp 4L or 7, or FMA Direct M5?

I'm sure they add a bit but, no, I don't have have any measured numbers for them.

Any FM receiver with any sort of processing is going to add a slight bit of latency. For example, the Multiplex IPD receiver adds one frame time plus 2.3 ms (about 22.4 ms with a Futaba 9C). I would think the receivers you listed would not be any more than that.

- John

Protos -- Logo 14 -- Logo 10
01-18-2007 Over year old.
 
 
GimbalFan
Elite Veteran
Location: Copter County, Nv

This is worth repeating even if it's been said before:

A great deal of thanks is owed to John Kos from all of us for all the bench testing he's done the last couple years on a variety of RC radio gear, and for his time spent compiling the results and posting them here. This wealth of unbiased data continues to inform our decisions about what we buy and why.

No matter what other radios I may acquire over the coming years I'll always own a Stylus, for reasons obvious to anyone who's read this thread. I've switched from among the slowest (a 7CHP) to among the fastest, and anyone else who's done the same can vouch for the surprising contrast in feel. If not for John's threads I wouldn't've known about such differences in speed.

There's also a side benefit of John's efforts to consider: The manufacturers are becoming increasingly aware that their potential customers have access to accurate, unbiased info, and the newer designs reflect a growing concern with staying competitive, much to our great pleasure.

I hope John gets an opportunity soon to do similar bench tests on the XPS module-based system. Many are waiting to see if the claims being made about its speed and range are accurate.

Keep up the good work John, and thanks.

op-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-t
01-19-2007 Over year old.
 
 
Tyler
Key Veteran
Location: Chicagoland area

AMEN

Gimbal fan, you have a witness!!
01-19-2007 Over year old.
 
 
JKos
Elite Veteran
Location: Town of California in the state of Maryland

Added data for a Multiplex Evo 9 radio. (Under PPM and eCCPM)

- John

Protos -- Logo 14 -- Logo 10
03-19-2007 Over year old.
 
 
GimbalFan
Elite Veteran
Location: Copter County, Nv

This whole thread is required reading for anyone who's looking to increase their understanding of the ins and outs of stick-to-servo speed.

John will be adding data to both the text table and to the chart at the top of the first page as his testing continues. If you haven't already, take the time to read this thread from the start -- it's an eye-opener.
03-19-2007 Over year old.
 
 
Razmo
Key Veteran
Location: Chicago

Gimble Fan,

Any chance that you will be testing the AR6100 Rx for the DX7? I can send you one to play with if you wouldn't mind returning it when you're done.

Raz
03-19-2007 Over year old.
 
 
hilgert
Heliman
Location: Flower Mound, TX - USA

The AR6100 has the same receiver/antenna (a dipole) as the AR7000; the AR7000 just has two receivers. So, range and latency would(should) be the same; you just loose path diversity with the AR6100 (which I have found not to be a problem in the models I fly).

I tested both the AR7000 and AR6100 and I got the same results either way for latency (and range) with the DX7 (at least that I noticed on my digital scope). I was looking for general differences and found none; if there was a one or two msec difference it did not stick out enough for me to notice. This was done some time back, and I no longer own the DX7 so I can't test again.

-Hilgert
03-19-2007 Over year old.
 
 
GimbalFan
Elite Veteran
Location: Copter County, Nv

Quote 
Gimble Fan, Any chance that you will be testing the AR6100 Rx for the DX7? I can send you one to play with if you wouldn't mind returning it when you're done.

Raz, the tech head who produced the data above and who started this thread two years ago is John (JKos), not me.

I wouldn't be surprised if John already has plans to test that tx/rx combination soon and I doubt you'd need to send him a rx to see the results -- but Hilgert may have already provided your answer just above.

op-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-t
03-19-2007 Over year old.
 
 
JKos
Elite Veteran
Location: Town of California in the state of Maryland

The DX7/AR6100 combo is the same as the DX7/AR7000 combo down to a few tenths of a millisecond. I added it to the chart (text so far, not the graph).

I will test any tx or tx/rx combo I can get my hands on. I need to get a Futaba 6EX 2.4 GHz system and see what they are up to.

Thanks,
John

Protos -- Logo 14 -- Logo 10
03-19-2007 Over year old.
 
 
sharam
Elite Veteran
Location: Northern California

JKos, my thanks also. Great research and info.
03-20-2007 Over year old.
 
 
48 pages [ <<    <     4      5     ( 6 )     7      8     NEXT    >> ]70186 viewsPOST REPLY
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Radio - Servo - Gyro - Gov - Batt > TX/RX eCCPM Latency Test Results
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