New radio= faster laps?
#16
Once I made a HRS to normal converter so I was able to use analog servo's on a high framerate system.
On a scope it shows like this:
Above the HRS input and under the normal output and every pulse is information for the servo. As you can see in the blank time an analog servo needs you are missing several pulses. The missing pulses could obtain small movements or a slow (but bulding up) movement which is not noticed by the servo or transferred in more schocking steps.
The high framerate does simply give a better, faster and smoother control of the car.
On a scope it shows like this:
Above the HRS input and under the normal output and every pulse is information for the servo. As you can see in the blank time an analog servo needs you are missing several pulses. The missing pulses could obtain small movements or a slow (but bulding up) movement which is not noticed by the servo or transferred in more schocking steps.
The high framerate does simply give a better, faster and smoother control of the car.
#18
That's actually very true but there is another problem to contend with. Cheap radios with high latency also tend to have a big variance in the latency, especially if they also have a low frame rate. A fast, high frame rate radio might have an average latency of say 4ms with a high of 6 and a low of 2 so the biggest difference you will ever see from one input to the next is 4ms. A cheap radio might have an average latency of 20ms but it varies from 12 to 30. That's not good. If it was 20ms EVERY SINGLE TIME, no problem at all but if one corner it responds in 12 and the next corner 28, you will struggle with consistency.
Or I'm probably just driving slower than you so that 15-20ms delay is not affecting my driving.
#19
Me? Oh no. I am a guy who want to race cheap and want to try stuff from outside the box. This was just to use a modern transmitter with some old high performance servo's. 2 euro electronics is much cheaper than 60 euro digital servo's....
#20
No I don't because I have never seen proper independent tests on car radios however if you do some searching you can find lots of tests on plane radios. Heli guys seem particularly preoccupied with latency. The variance on some plane radios is disturbing.
Also it doesn't take tests to realize that lower frame rates are going to have more variance. Just think about it.
Also, I use the word "cheap" as a generalization but it isn't really accurate. I'm sure some cheap radios perform quite well (MT4 for example) while some expensive ones are junk.
Also it doesn't take tests to realize that lower frame rates are going to have more variance. Just think about it.
Also, I use the word "cheap" as a generalization but it isn't really accurate. I'm sure some cheap radios perform quite well (MT4 for example) while some expensive ones are junk.
#21
Tech Champion
#24
I went from a dx3r to a 4px. for the last year I was averaging middle of the pack, which was frustrating for me, as I been running 8th scale for 10 years lol...
So for the last few races I have improved HUGE... Im more consistent, I will say I do belive my lap times have been faster. Normally Id call BS on a statement like that but.... Switching to the new radio on the same layout, there was a section that I was trying to land-gas-brake before a turn... well I couldnt do that but I could see others doing it. Once I got the 4px, I could as it responded faster. Now I understood how others got thru that section so fast.
Im also def not making as many mistakes and thats a huge help... being able to catch a bobble before it causes a marshal to get you is priceless.
So for the last few races I have improved HUGE... Im more consistent, I will say I do belive my lap times have been faster. Normally Id call BS on a statement like that but.... Switching to the new radio on the same layout, there was a section that I was trying to land-gas-brake before a turn... well I couldnt do that but I could see others doing it. Once I got the 4px, I could as it responded faster. Now I understood how others got thru that section so fast.
Im also def not making as many mistakes and thats a huge help... being able to catch a bobble before it causes a marshal to get you is priceless.
#25
Once I helped a guy with a DX3R. Het was not happy with his transmitter so I walked through the settings. I noticed his framerate was set to 16.5msec. As he did not know what the setting actually does I changed it to 5.5msec and he noticed the change in feeling, it was much better. It would not supprise me more users are not using the fast framerate setting.
#26
Tech Regular
Once I helped a guy with a DX3R. Het was not happy with his transmitter so I walked through the settings. I noticed his framerate was set to 16.5msec. As he did not know what the setting actually does I changed it to 5.5msec and he noticed the change in feeling, it was much better. It would not supprise me more users are not using the fast framerate setting.
#27
Thanks for all this information
#28
#29
Radio
One thing I have definitely experienced is that older radios tend to lose their centering precision. Whether it is the potentiometer, the connection to the potentiometer or the linkage centering the steering, it becomes difficult to get the servo trimmed correctly and constantly needs adjustment. If your car slightly wanders a different direction every time you turn, it makes it very difficult to be consistent when you have to correct for it.