EXT2Rob

My Feedback: (1)

Huh! Hobby King re-labels FlySky stuff and sells it as their own? Interesting.

I've owned GT2s for three years, never had any issues. Just got a GT3C this year. Love it, everything works. Tho the GT3C, being powered by a 1S lipo (4V), doesn't have the range the 10V GT2 does.

I have had to replace ONE receiver in the 4 years I've been into this stuff. A new receiver...$10. I could buy ten FlySky receivers for the price of one Futaba.

There is nothing wrong with FlySky, they make fine sportsman stuff. If you're a "pro" racer, then yeah, you might want a better radio. But for the most of us bashers on a budget who want 2.4ghz, FlySky is IT.

collector1231

My Feedback: (1)

Actually, if you ARE a pro racer, Flysky is pretty good. Check it out; http://www.hobbypartz.com/79p-it4-to...-titanium.html

nitroexpress

FlySky has a very high latency (it is slow). No Pro racer would consider it.

collector1231

My Feedback: (1)

So? Can the driver feel this 1-5MS difference? Just like with buying a monitor. If you want one with 3ms refresh rate, but one with 5ms is cheaper, can you count 2ms?

cumquat

for someone competing in IFMAR worlds, they probably can. following your logic, there is no need to go for a .06 second 60* travel servo over a .1 second 60* travel servo. so you have a radio that has a .05 second delay from input to action, then a .1 second servo throw so from the time you turn the wheel until the tires actually turn you have a ~.15 second delay. all your competitors are running the .06 second servo and radios with .01 second reaction times. that means their elapsed time from input to action is .07 seconds. that's twice as fast as yours!

all that said, most bashers have servo speeds above .13 seconds, so the additional lag the radio may add wont be as noticed.

EDIT: brain fart. most of this comment may be incorrect but i'm too lazy to fix it.

nitroexpress

From another forum -

"As for the framerate, the GT3B/GT3C are somewhere around 22ms. The info, which I received directly from Flysky says, that the framerate of the iT4 is 5ms - but, still I haven't found any confirmation,"

OliverJacob

My Feedback: (12)

fyi - 1 ms = 1/1000 sec or 0.001 sec - a true frame rate of 22ms (0.022 sec) is more then sufficient. This has nothing to do with the servo speed.
This means the rx will check the inputs every 22ms and will send these commands to the rx

nitroexpress

Middle grade and higher systems usually spec out to single digit. Course this doesn't matter to bashers. But no racer in their right mind would consider 22ms.

collector1231

My Feedback: (1)

Humans can't even feel hose extra .00015 seconds...

nitroexpress

The more control input, the greater the discrepancy. Turn the wheels left, right, left and you're talking 66ms.

nitroexpress

And yet, some people agonize over servo speed.
.06/60 deg sec is better than .20/60 deg

phmaximus

I've seen racers using a Flysky controller.... I've even got one myself

After reading this thread it appears like some people don't know the difference in frame rate and latency.

I think anyone that thinks they have lag is talking out there ass and has never tried one or they are just quoting other peoples BS from the internet.

phmaximus

I don't mean to offend, but who told u that? They should be shoot.

Did they happen to say what radios have single digit spec that's not a highend S-FHSS or DSM2???

because I don't believe it

nitroexpress

Why eliminate S-FHSS and DSM2? Do you consider both of these high end radios?

nitroexpress

Well, you certainly aren't shy about putting people down. You sure you don't have some SuperTib in you?

BTW, is it possible for you to turn down the potty mouth routine?

collector1231

My Feedback: (1)

Nitro, you are just addin' nitro fuel to the fire... (get it? :P)

Also, Spektrum made that graph. Most companies fake the results. Real MS ratings for the DX4S is about 8MS, using the supplied DSM2 receivers. The FlySkyIT4, however is 10MS. But, like I said earlier, try counting 2ms.

collector1231

My Feedback: (1)

And speaking of feeling the difference, I feel absolutely no difference in latency between my 3 year old DX3C and new DX4R Pro.

phmaximus

My bad... Sorry man I dident mean to offend u. It's the Aussie in me. Rude, crude and straight to the point.
I've got a habbit of doing it, honestly I don't mean to be an ass it's just our cultures are just so different.

I'll see if I can rephrase with more context.

After reading about the GT3c from a lot of sources online I was really worried about it having lag. But, I ordered one anyway. And comparing it to my old controller a Traxxas TQi 13ms I can honestly say.... I cant feel or see a difference in the response.

So I've got this suspicion that most of the sources that say the FS GT3c is slow are just quoting each other that started from someone's opinion and everyone quotes each other, as if it's a fact.

And after reading your negative posts about the controller I wonder... Are u just quoting people's opinions? or do u know some thing we don't know? or do u have hands on experance with it and have personally felt this lag?


Slightly off topic.... I know for a fact there is a huge noticeable difference in a servo with a transit time of 0.02 compared to 0.01 and under.

EXT2Rob

My Feedback: (1)

"Potty mouth routine"? Seriously? Sheesh. Anything really offensive gets *******'ed by the forum software. Lighten up, mate.

collector1231

My Feedback: (1)

EXT2Rob is right. It is a little overprotective, though. Watch me type E X P R E S S R C H O B B I E S; express*********. See the part with stars? I didn't do that.

jrf

My Feedback: (551)

Back to the original question of this thread and the answers received. It seems that many people don't know that 2.4 is AM. Frequency hopping helps eliminate interference, but it doesn't do a thing for "line of sight" issues.

OliverJacob

My Feedback: (12)

They operate rather in the PCM mode, which is a form of frequency modulation (FM).
And do you actually drive your rc car out of range with a 2.4 Ghz radio? Very unlikely.
'Line of sight' is a misleading term, you still get reception when you are 'out of sight'.

So if someone asks which radio is the best - with 2.4 Ghz, interference is a thing of the past.
They are more reliable and stable.

jrf

My Feedback: (551)

You are confusing Frequency Hopping with Frequency Modulation. Spread Spectrum systems change frequencies constantly, but once they are on a frequency, the data is usually transmitted by AM. The following is from http://www.eetimes.com/document.asp?doc_id=1271899

SyCo_VeNoM

Look at the date on the paper... What was usually done 10+ years ago isn't done anymore in most areas of technology as it rapidly has changed... Now if you find a paper written in the past 2 years then that would give validity to what you said. From what I was told when I was in college for electronic engineering (around the time that paper was written) we were told after a certain frequency AM just doesn't work properly anymore(it was in the MHz from what I remember), also with how much data these controllers now send AM would have have way too many errors in the Ghz range. If I really wanted to I guess I could go dust off my oscilloscope, and hook a radio up to it to make 100% sure as I'm only 99.9% sure its FM

jrf

My Feedback: (551)

OK, you are correct. I looked up the compliance specs on Spectrum, Hitec and Futaba. Spectrum and Hitec don't tell you (?), but Futaba is using FM. I assume, to keep up, that the others are also.

Sorry.