Spot on!

Found what I might consider the gold mine of our radio for steering response. I will have to check what my radio is set at, being that this is my first digital radio I was unaware of the radio having settings like this.

TLDR: We can change our PWM frequency for servos and potentially get a faster response rate out of the radio settings.


Copy/Pasta from the manual.

7.6 Servos Frequency This function is used to select the frequency of channel data PWM signals. The function includes analog servo (95 Hz), digital servo (380 Hz), and custom frequency. You can select or set the correct output frequency value according to the servo used. By default, the system adopts the digital servo. The custom frequency adjustment range is 50-400 Hz. The servos frequency varies slightly with the connected receivers. For the Classic Version Receiver 1. Click [Servos Frequency]. 2. Click the corresponding option. Click to return to the previous level interface. • If the transmitter RF Setting is set to [AFHDS 3 1 way], modify the servo response speed and then tap . The system prompts "It takes effect after bind or re-bind. Are you sure you want to bind?" 3. If you choose [Custom], click "+" or "-" to adjust the frequency. For the Enhanced Version Receiver [SR]: One of the specifications in the servo frequency (PWM frequency is 833 Hz). [SFR]: One of the specifications in the servo frequency (PWM frequency is 1000 Hz). Note: the conventional servo response speed (PWM frequency) is 50-400 Hz. The delay of the whole system will be greatly improved when SR and SFR are selected. Make sure that the adapted servo supports the corresponding frequency. Otherwise, it may cause the servo not to work properly or even damage the servo. Setting A Channel Sets PWM frequency for a channel. [Synchronized with RF]: The digital signal of low frequency is synchronized with the digital signal of radio frequency. Setup: 1. Click [Steering Digital Servo] or other options to enter the function setting interface. 2. Click the corresponding servo frequency according to the actual state of the adapted receiver. Click to return to the previous level interface. • Click the check box on the right of [Synchronized with RF]. The icon will change to . The servo frequency of this function will be synchronized to RF after it is checked. 3. If you choose [Custom], click "+" or "-" to adjust the frequency value. Setting All Channels Sets PWM frequency for all channels. For function Setup, refer to the Setup section of Setting A channel above.

We designed our servos to run both SR and SFR mode. I only run the NB4 with SFR mode enabled, and binded in one way mode as well. Your getting everything out of the controller in terms of responce then.

Can 100% confirm that Sanwa servo's do have a delay when used with the Noble Pro. Marc Rheinard, Mr 5 time, Spent 6 days at my track testing between USIC and the 12th worlds. At USIC he kept complaining that his 12th scale did not turn and was lazy. His mechanic worked on it, Max worked on it, Kemp worked on it and it still didnt drive to his liking. At my track, after 3 days of testing, Max asked to drive his car. First time down the straight Max nearly drove head on into the wall as the car did not turn as expected. It simply felt broke he said. Marc asked his contacts at Flysky and they told him to try something other than Sanwa as they know there is a delay issue. He put a brand new Sanwa in and it felt exact same, He put another brand servo in and was instantly .2 faster a lap and the car felt perfect.

If you are having issues and use a Sanwa servo try another brand.

EA

When I first got back into RC 8-9 years ago, I used Sanwa servos...and, over the next 2-3 years, I grew to dislike them more & more. They are noisy, and power-hungry. Despite the high cost, I have Tekin & Futaba servos a try. I liked both, but 'disagreed' with the high cost. I also disliked the rudeness of Tekin support. Since then, I've tried a few different brands, and these are, by far, my favorites: ProTek, Power Hobby, NFCRC, and AGFRC. Are are reasonably-priced, long-lasting, and quiet.

I bought a FGR4B receiver so I could use the "enhanced receiver" mode and get the SR/SFR frequencies out of the radio, this sets the PWM frequency to 833 and 1000 respectively. None of my servos could handle the SR/SFR setting, they all go herga derga and will not respond to input or they start spazzing out. I tried both Tekin and Protek without any success. I plan on getting an MKS that can be programmed from the radio so that I can fully eliminate any possibilities of incompatibility. I'm not ready to throw in the towel on the NB4 but the Sanwa radio simplicity is starting to look better and better. If a US vendor had the FlySky servos it would be different, I might harass my local hobby shop this afternoon and see if any of his suppliers can get one of their servos. Unfortunately, the only market I can find the in servo is in China.

I did find another setting in the manual that can "reduce latency" and that's by putting the receiver in a 1-way bind. This does not transmit data back to the radio, you lose the receiver's telemetry which to be honest is fairly useless for on-road racing. If I was flying/boating and had a fuel gauge or voltmeter I could see needing the benefits of 2-way but I don't look at my radio between the horn going off and the end of a race. I'm going to be at practice again tonight, while I'm not gaining much traction hopefully there's something to take away from all of my testing. I do believe the radio is a very great option for a mid-class radio system at the moment. It might get better if we can find the right combination, it's just trial and error at this point.

You will want the 1 way mode 100%. The radio in 2 way mode is terribly slow when I tried one. Bad enough that it was pretty much useless for me.

EA

Did you check if the servo's are SR compatible?
SR is using the so called small band servo protocol which uses a center pulse width of 760 uSec, half the time than the 1.52 mSec normal servo's are using. Normal servo's expect such a pulse, when they do not get that, they do not understand. I do not know what the frequency range is of the NB4 SR mode but these smallband servo's are well used as an heli tail servo in combination with a gyro. These Heli servo's are easy to find and are mostly rated up to 500 Hz, not the 833 Hz SR normally is limited to.

I've not seen a servo rated for "SR". At best the only dead band info I can find is 1520uS/333 hz.

I'm starting to put the puzzle pieces together. Slow learner.... If the servo working frequency isn't rated for SR/SFR (833/1000) then it's not going to work if the radio is in SR/SFR mode.

You can buy any standard digital servo but if it can not work with a different center than 1.52 msec then it will not work on SR or any other so called fast response mode. Like SSR from Sanwa is using a centerpulse width of 300 uSec and Futaba its new UR is even 200 uSec.

You need an SR/SFR compatible servo period to run those modes. You can ruin a servo if you try to run those modes with a servo not designed to run those fast modes. Just because a servo is capable of running at 1000hz doesn't mean it can run SR/SFR mode. If anyone on here wants to utilize those modes to get the maximum performance the radio can provide our servos fully support both modes, and I am sure a few others out there as well. Remember to bind in 1 way mode as well.

Hi FlySky community, the recent FlySky surge among pro drivers has been hard to ignore (marketing did it's job in my case :lol:), and combined with the age of my radios and the fair price I've decided to give the Noble NB4 a go. Coming from a Spektrum DX3R pro (which I'm very happy with, just thought I should give the new technology a go), there are plenty of new functions on this radio and I'm thrilled to try it. A bit worried how it will go since I'm so used to my DX3R Pro (only serious radio I've ever actually used!), but excited. I'll be using the NB4 to control my 1/8 GT nitro cars.

While it's on the way, I was wondering is there something I need to know before starting? Should I update to the newest firmware (I read there were some issues with full throttle on the throttle channel, but I'm sure you guys have figured out the root of this in the meantime)?

I ordered some additional FGR4S receivers, as I figured out those are car specific ones. Hope they are fine on direct 2S LiPO power.

I haven’t run nitro in 20 years, but I thought an external antenna was desired due to the interference created by the engine.

I just updated my firmware on my nb4 pro to the latest version. Besides the look of the screens I dont really know what has changed. I Have had very good results with this radio over the past year. Absolutly no issues with throttle functions and no issues with anything.

I know nobody has a crystal ball, but any indications of a replacement/update to the NB4 (non pro) radio? I'm about ready to purchase one, but hate to do so if any news of an update coming (usually my luck the day after I buy something).