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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › TX/RX Latency Test Results
01-15-2010 03:44 AM  8 years agoPost 1181
bigbadflyer

rrVeteran

Middle Earth New Zealand

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Do we really think there would be a big latency difference (or noticeable to humans) between the Futaba 12Z and the 12FG??

I'm about to have both and am wondering which TX is going to be better as I am only going to keep one.

Apparently the 12Z feels beautiful in hand but I really dont want to be going backwards in speed.

Thoughts ?????

C.

.
..
...

New Zealand Helicopter Sheep Hearding Champion :-)

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01-19-2010 03:28 AM  8 years agoPost 1182
JKos

rrProfessor

Redondo Beach, CA

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I added numbers for the Futaba 8FG to the table. I need to update the charts.

- John

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01-19-2010 04:15 AM  8 years agoPost 1183
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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Anyone offer to send you an SD-10G yet?

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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01-20-2010 02:09 AM  8 years agoPost 1184
Four Stroker

rrElite Veteran

Atlanta

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John;

That's a very interesting result. The HS RX essentially chops 7 ms off of both maxes. I understand Baxter's position now. For the 12Z,14MZ it would make no noticeable difference in latency. Very good numbers for a cheap radio.

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01-20-2010 03:34 PM  8 years agoPost 1185
CoronaL

rrKey Veteran

Winnebago IL

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would be interested in the Airtronics SD10-G with the FHSS-1 and FHSS-3 Rx's. Also, the new Hitec Aurora with the 6,7,9 ch rx's.

Randy!!! I am the liquor

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01-20-2010 03:36 PM  8 years agoPost 1186
cbflys

rrVeteran

Nesconset, NY - USA

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John has tested the Aurora, results should be available in a few weeks.

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01-20-2010 05:20 PM  8 years agoPost 1187
satnaam

rrApprentice

GTA Ontario CA

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Aurora Tested
Looking forword to this , but bought the system already. I like it, I think Hitac has a winner.

satnaam

1 O`NKar, Satnaam

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02-13-2010 03:28 AM  8 years agoPost 1188
TMoore

rrMaster

Cookeville, TN

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Aurora Tested

Looking forword to this , but bought the system already. I like it, I think Hitac has a winner.
Depends on how you classify a winner. I wouldn't necessarily call 52ms average latency a winner but that's me.

TM

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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02-13-2010 04:28 AM  8 years agoPost 1189
CoronaL

rrKey Veteran

Winnebago IL

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I would be very intersted in Jkos testing the SD-10G with the FHSS-1 and FHSS-3 rx's. Not sure why this radio hasn't been tested yet. They claim 7ms and some awesome numbers. I don't want to be the nagging nellie, but I like independent #'s to compare to the other independent numbers.

Randy!!! I am the liquor

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02-13-2010 12:45 PM  8 years agoPost 1190
hootowl

rrProfessor

Garnet Valley, Pa.

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Looks like Futaba rules with the 10C. I really like that radio. It has a great display that's super easy to see. Also has similar programming to the 9C so it's really easy to learn. I can't believe Futaba beat out the DX7SE. The 10C is a nicer radio because it's a level up from the 7 or eight channel radios. KILLER

Wolves don't lose sleep over the opinions of sheep

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02-13-2010 02:18 PM  8 years agoPost 1191
kej

rrApprentice

Denmark

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What were the Aurora values?

Kim Jensen

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02-13-2010 04:26 PM  8 years agoPost 1192
TMoore

rrMaster

Cookeville, TN

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The A9 runs at 52ms. It is more or less a repeat of the Eclipse that JKos tested a few years ago.

TM

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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02-13-2010 04:44 PM  8 years agoPost 1193
DougV

rrVeteran

Miramar, Florida - USA (Ft. Lauderdale)

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It will be nice to see John's (JKos) A9 testing results.

Doug.

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02-13-2010 05:43 PM  8 years agoPost 1194
TMoore

rrMaster

Cookeville, TN

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It's in the latest RC Heli Magazine.

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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02-14-2010 09:27 AM  8 years agoPost 1195
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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The A9 runs at 52ms.
Lots of pilots like that radio, and telemetry is a no-doubt useful improvement, but a 52 ms latency in today's field of play just isn't acceptable. 20 ms and less is now commonplace.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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02-14-2010 10:04 AM  8 years agoPost 1196
A.T.

rrNovice

N.Z.

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To quote Mike on another forum today "That's what they say, but in all the time the Aurora has been on the market there is not one comment that the radio feels slow... in fact, to the contrary, many say it feels faster and much more locked in than what what they had been using.
Even the pilots in the test said he did notice a slight difference between the Aurora and DX7 SE but commented that the radio didn't fly like those numbers suggest... I think there are other factors, like the fact that we transmit 5 times the data per packet than Spektrum.
Anyone feel their Aurora feels like these numbers reflect?
FYI: The latency between the module and RX is 20ms, not the 14ms that was posted earlier. This estimate was based on the feel of the system compared to others. 52ms is the overall latency average with 42ms being the minimum from stick input to servo movement.
Still, it is unlikely that anyone other than a high level 3D heli pilot would be able to decipher the difference in latency of the Aurora vs other systems as indicated by the real world experience of its users. Mike. "
regards
Alan T.

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02-14-2010 10:25 AM  8 years agoPost 1197
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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To quote Mike on another forum today... "Still, it is unlikely that anyone other than a high level 3D heli pilot would be able to decipher the difference in latency of the Aurora vs other systems as indicated by the real world experience of its users." - A.T.
As has been the consensus for some time now in serious tx~servo latency discussions, flying competitively and skillfully with above-average or even sky-high stick-to-servo latency (i.e. Futaba 9C's) is no issue -- the human brain adapts quite nicely. Where latency comes into play is in the capacity to correct for a dumbthumb or an equipment failure before ground contact.

Leading one's stick movements in order to adjust the timing of one's intention for a subsequent delayed aircraft behavior is easily learned, but all the clever mental adjustments in the world can't buy the space you gain between a bird and the tarmac with a fast tx when the inevitable shlit hits the proverbial fan.

If Aurora's 52 ms overall stick-to-servo latency is verified, well -- that's slow.

I've been flying a 21 ms rig for 3 yrs now after previously flying an 80 ms rig. That change was a real eye-opener. I recently slid into an 11 ms rig. I'll admit I can't feel a 10 ms difference while 'flexing the links', but the helibux I'll save the first time I see a 4" dirt nap space-to-tarmac save will likely pay for the tx.

A college cohort dubbed it 'the rachet effect': Once you've tasted significant improvement in anything technically useful, it's nearly impossible to accept a downgrade. For me, even for telemetry I couldn't step down. Latency matters.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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02-14-2010 12:40 PM  8 years agoPost 1198
DannyZRC

rrNovice

Merced, CA

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it's a simple matter of proactive vs reactive control situations.

flying an aerobatic routine is mostly proactively following a pre-planned set of movements, but the aircraft is constantly reacting to the impure real world environment of passing thermals and changing wind conditions, in reality you're constantly adjusting and readjusting your control inputs.

the average visual stimulus reaction response is in the 140-160ms range, call it 150 for the sake of argument.

adding 11ms to 150 is increasing the length of your control loop by ~7.3%

adding 52ms to 150 is increasing that loop by ~68%

if you're just putting around the sky, you won't notice or care.

but if you're in a rapidly evolving situation, the longer control loop means fewer control actions are made, and you'll fall behind on corrections until you blow your line, or crash, or something else.

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02-14-2010 01:41 PM  8 years agoPost 1199
CoronaL

rrKey Veteran

Winnebago IL

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I agree with Gimbelfan. No reason IMO for a new to market radio to have such POOR latency numbers. I'll take the RC Heli comments with a grain of salt, b/c they don't want to totally slam a product of a larger advertiser and risk that account being pulled.

I was as close to ordering the Hitec as I could have been, but had heard something a couple weeks ago bout the 42ms MINIMUM latency and that just put a screeching halt to my purchase.

Glad I held off b/c honestly, I would be looking for another radio again lol. The Hitec seems to be a great featured radio with big potential for most sport pilots. If they can better their latency numbers with firmware updates etc... then good for them. But still a 20ms update rate isn't anything to be proud of. So even then it would be off my list of potential upgrades.

JR/Spektrum is keeping me for now. Might be a chance I go to Airtronics, but that will depend on how the new Spektrum/JR products fair vs if ATX eventually releases any Rx's that are more affordable in the FHSS-3 type, and have features like the AR7100 rx, plus can take a straight 2s lipo.

Randy!!! I am the liquor

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02-14-2010 02:26 PM  8 years agoPost 1200
Don

rrApprentice

WI

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What is the latency of my Futaba T8UHs with a Berg7p Rx?
I'm running in PPM mode and 72MHz.

Just a ballpark figure....

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