Jumper T8sg and E010s flysky AFHDS = latency

goebish
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14 Oct 2017 18:58 #65063 by goebish

Replied by goebish on topic Jumper T8sg and E010s flysky AFHDS = latency

Please keep posting in english, that's simpler for everyone

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goebish
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14 Oct 2017 20:19 #65064 by goebish

Replied by goebish on topic Jumper T8sg and E010s flysky AFHDS = latency

@Gerald, I extended the range to -300 / +300 kHz, same link:
www.dropbox.com/sh/mw7ltu27dvr69o2/AACLP...FaAaUqXRqNWSzHa?dl=0

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vlad_vy
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15 Oct 2017 05:42 - 15 Oct 2017 06:22 #65068 by vlad_vy

Replied by vlad_vy on topic Jumper T8sg and E010s flysky AFHDS = latency

Switch names are the same, but direction reversed. SWx0 interchange with SWx2. Look descriptions to Jumper T8SG builds.
www.deviationtx.com/forum/builds/7346-jumper-t8sg-builds

Last edit: 15 Oct 2017 06:22 by vlad_vy.

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Gerald
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15 Oct 2017 07:44 - 16 Oct 2017 08:39 #65069 by Gerald

Replied by Gerald on topic Jumper T8sg and E010s flysky AFHDS = latency

Hello goebish and vlad_vy, I just tested the new firmware with range -300 / +300 kHz, it works but the optimal value for me is -186 (I will test latency again this afternoon). I did not try to retrieve my old model file. The switches are again functional, I do not know if it was a problem of flash (Dfuse 2.0) or if it was because of my file of my old model file. Thank you.

EDIT : It works, the drone is controllable thank you !

However under Betaflight after a moment there is again a bit of latency and it jerks, I do not know if it's normal.

Last edit: 16 Oct 2017 08:39 by Gerald.

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goebish
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15 Oct 2017 17:02 - 16 Oct 2017 01:05 #65073 by goebish

Replied by goebish on topic Jumper T8sg and E010s flysky AFHDS = latency

I wouldn't worry of the jerkiness in the BF configurator if the quad flies fine and without latency.
Maybe that's because this board is using a cp2101 uart to usb bridge instead of the F3 VCP, or just bad quality USB cable ...

So, you confirm that it's working fine now ? with Freq Tune set to -186 kHz ?
That's quite a lot, if my math is correct:
((16e6+77*16)*2)*0x4b = 2400184800
that means your A7105 crystal oscillator has a +77 ppm deviation while the datasheet states it should be +/-20 or even +/-10ppm, no wonder it doesn't work well without adjustment !
That's assuming that the one in the e010s (BeeCore F3 FC with built-in AFHDS Rx) is accurate, seems that's the case of the one I have ...

Last edit: 16 Oct 2017 01:05 by goebish.

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Gerald
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15 Oct 2017 18:54 #65075 by Gerald

Replied by Gerald on topic Jumper T8sg and E010s flysky AFHDS = latency

Yes, it's working fine now, with Freq Tune set to -176 kHz. The blue led is on almost permanently, do you want a video to see the adjustment of the freq tune parameter?

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goebish
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15 Oct 2017 19:07 - 16 Oct 2017 23:56 #65076 by goebish

Replied by goebish on topic Jumper T8sg and E010s flysky AFHDS = latency

No problem, I only wanted to confirm

I'll wait until AlbE and / or Fred confirm that it works for them too, then I'll make a pull request.

Last edit: 16 Oct 2017 23:56 by goebish.

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goebish
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15 Oct 2017 22:01 - 16 Oct 2017 11:53 #65086 by goebish

Replied by goebish on topic Jumper T8sg and E010s flysky AFHDS = latency

Interesting, looks like even many genuine AFHDS transmitter users are experiencing the same issue with this machine:
www.rcgroups.com/forums/showthread.php?2...mode%29#post36430221

Last edit: 16 Oct 2017 11:53 by goebish.

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amir_zohaib
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02 Jan 2018 07:52 #66672 by amir_zohaib

Replied by amir_zohaib on topic Jumper T8sg and E010s flysky AFHDS = latency

goebish wrote: A7105 crystal oscillator has a +77 ppm deviation while the datasheet states it should be +/-20 or even +/-10ppm, no wonder it doesn't work well without adjustment !

Hi, i just bought my T8SG and entered the realm of Multiprotocol,
can't you just replace the oscillator with a better one? is it hard to decap the module?

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goebish
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02 Jan 2018 14:44 #66680 by goebish

Replied by goebish on topic Jumper T8sg and E010s flysky AFHDS = latency

No need to replace anything, just flash the latest nightly and use the "Freq Tune" protocol option if necessary.
This option has been implemented in every A7105 protocols.

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Fernandez
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03 Jan 2018 17:34 - 03 Jan 2018 17:35 #66696 by Fernandez

Replied by Fernandez on topic Jumper T8sg and E010s flysky AFHDS = latency

If you watch this test video 4 Rx are being compared for range. However all of them do not have a PA/LNA and all of them use same chip, so basically you would expect range to be more or less in same league.

So would be interesting to see the Freq tune between the different RX, as differences in oscilator tune may explain the differences in range.......

Last edit: 03 Jan 2018 17:35 by Fernandez.

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