- Posts: 2633
Jumper T8sg and E010s flysky AFHDS = latency
12 Oct 2017 20:52 - 13 Oct 2017 00:15 #65003
by goebish
Replied by goebish on topic Jumper T8sg and E010s flysky AFSDH = latency
I replaced the 4-in-1 module, and it's working perfectly now ...
I don't think we can do anything in firmware, I'll tell dc59 to have a look at this thread and explain Jumper what's happening.
I think the problem is that the 4-in-1 module is not using a+/-20ppm +/-10ppm accuracy crystal for the A7105.
Stock module removed (I hate lead free solder, that required 400°C hot air) :
Stock module :
New module installed (it has 1 less pin, nrf24l01 CE, but this has no importance ...) :
edit: according to the datasheet, a +/-10ppm crystal is required when the Rx does not use frequency compensation, which is probably the case of flysky Rx clones.
I don't think we can do anything in firmware, I'll tell dc59 to have a look at this thread and explain Jumper what's happening.
I think the problem is that the 4-in-1 module is not using a
Stock module removed (I hate lead free solder, that required 400°C hot air) :
Stock module :
New module installed (it has 1 less pin, nrf24l01 CE, but this has no importance ...) :
edit: according to the datasheet, a +/-10ppm crystal is required when the Rx does not use frequency compensation, which is probably the case of flysky Rx clones.
12 Oct 2017 21:25 #65005
by goebish
Replied by goebish on topic Jumper T8sg and E010s flysky AFSDH = latency
Here's a FFT with the replaced module:
It's not perfectly centered on 2405 either, but it has ~30 kHz less drift than the stock one, I'm not sure that was the issue, but replacing the module has fixed the problem anyway ...
It's not perfectly centered on 2405 either, but it has ~30 kHz less drift than the stock one, I'm not sure that was the issue, but replacing the module has fixed the problem anyway ...
13 Oct 2017 13:07 - 13 Oct 2017 13:08 #65033
by goebish
Replied by goebish on topic Jumper T8sg and E010s flysky AFSDH = latency
I think that's just a matter of (bad) luck for now, if you can bind to and control all your aircrafts you shouldn't be concerned 
13 Oct 2017 23:10 - 14 Oct 2017 12:57 #65048
by goebish
Replied by goebish on topic Jumper T8sg and E010s flysky AFHDS = latency
Here's a test build with a new Flysky protocol option: Freq Tune
Use it to adjust the A7105 LO base frequency, it can be fine tuned from -200 to +200 kHz, that should be enough ...
The best setting has to be found manually, as this is a 1 way protocol there's no way to auto-tune.
Firmware for T8SG, you only have to flash the .dfu with devention DfuSe Upgrade Tool:
www.dropbox.com/sh/mw7ltu27dvr69o2/AACLP...FaAaUqXRqNWSzHa?dl=0
And as a bonus, a video for AlbE & Fred that explains how to fine tune, in french
Please report !
Use it to adjust the A7105 LO base frequency, it can be fine tuned from -200 to +200 kHz, that should be enough ...
The best setting has to be found manually, as this is a 1 way protocol there's no way to auto-tune.
Firmware for T8SG, you only have to flash the .dfu with devention DfuSe Upgrade Tool:
www.dropbox.com/sh/mw7ltu27dvr69o2/AACLP...FaAaUqXRqNWSzHa?dl=0
And as a bonus, a video for AlbE & Fred that explains how to fine tune, in french
Please report !
14 Oct 2017 16:12 - 14 Oct 2017 16:20 #65057
by goebish
Replied by goebish on topic Jumper T8sg and E010s flysky AFHDS = latency
FFT plot with Freq Tune set to -76 on my TX (the one in which I replaced the module for nothing ):
It's almost perfectly centered now! Without tuning there was a +80 kHz drift as it can be seen on the previous capture.
):
It's almost perfectly centered now! Without tuning there was a +80 kHz drift as it can be seen on the previous capture.
Time to create page: 0.154 seconds
-
Home
-
Forum
-
General
-
General Discussions
- Jumper T8sg and E010s flysky AFHDS = latency