Number of frame losses

[augur]

Hi.

With actual firmware I have round about 100 lossed frames during one flight with Sbus connected. Is this normal or too much (as there are many frames per second I would think it is fine, but I am not sure). What is common for this? As it is a digital protocol no frame should be lossed???

Cheers
Nils

[georgi UK]

=] No, this is not acceptable, you need to get raw logs posted up as Xrayted has already requested.....

[augur]

Hi Georgi,

where did he request it? Could not find anything with help of forum search.
(The frame loss rate is much better now after last update because Art fixed something because of FASSTEST telemetry. Before it was thousand and more lossed frames - https://www.helifreak.com/showthread...=lossed+frames).

Cheers,
Nils

[omerco]

With DSMX and DX9 i get 0 - 2 frame losses P/Flight. 100 means you have control locks during your flight, even if you don't feel them.

[augur]

Ok, perhaps Art read it here or in my mail that with FASSTEST there should be still an issue with framelosses.

Cheers,
Nils

[A VIKING]

Originally Posted by omerco

With DSMX and DX9 i get 0 - 2 frame losses P/Flight. 100 means you have control locks during your flight, even if you don't feel them.

I get the same frame losses with my DSMX and DX9 setup with recordings sometimes showing 3 frames lost.
No matter what ship I fly or how the flight is flown it seems constant.

Are "0" frames lost attainable Omer?
I am not worried about it just curious as to what it would take.

[georgi UK]

=] use a long Spek cable, and let the sat dangle!

[omerco]

Originally Posted by A VIKING

I get the same frame losses with my DSMX and DX9 setup with recordings sometimes showing 3 frames lost.
No matter what ship I fly or how the flight is flown it seems constant.

Are "0" frames lost attainable Omer?
I am not worried about it just curious as to what it would take.

0 is probably rare for 3D and such, but if I get 2 for hard 3D that's great. I used to have 10-15 with my old dsm2 dx7 and had no bad effects as well.

[A VIKING]

Originally Posted by georgi UK

=] use a long Spek cable, and let the sat dangle!

Keeps getting tangled in the tree branches.

Would it be a accurate statement that the better your sat placement the lower the frame loss would be?

[omerco]

Sure does...

[augur]

But fasstest Sbus connection should not behave like a Spektrum sat because the receiver handle frame losses itself. So it should be frame losses from the link between SK720 an 7008SB.

[omerco]

True

[A VIKING]

Originally Posted by omerco

True

Interesting.

[Xrayted]

Originally Posted by A VIKING

Keeps getting tangled in the tree branches.

Would it be a accurate statement that the better your sat placement the lower the frame loss would be?

Sure does. I had one of my sats installed "properly" by basic sat standards with both whiskers hanging clear of the CF frame out back, yet was seeing frame losses in the hundreds on one port.

Once I established which sat it was, I determined that although they were clear of the frame, the sat was stuck on the inside edge of the frame back which placed the whiskers behind my 12S pack when the heli was nose it at certain angles.

I relocated the sat to the outside of the frame, and even have one whisker blocked by the frame, yet the losses are now 0-4 in flight with the new location even with less than perfect positioning.

You have to walk around the heli and envision all of the line of site paths between you and the sats, and in my case I didn't consider the batts being installed when I first did this

[omerco]

Take into consideration that only the left antenna (when the cable is pointing your way, and the printed "X" is up) is the active one - the right one is just neutral/reference. you need to have the left out of the frame.

I also do my range check the same way - 360 deg around the heli - to find the blind spots.

[georgi UK]

T

Originally Posted by A VIKING

Would it be a accurate statement that the better your sat placement the lower the frame loss would be?

=] Martin, I will say this here for you because it can generate undesired responses from confused dipole radio hams.

As you look at the sat, DSM2 or DSMX label facing you, the LH antenne is the "active" antenne, it communicates with the RH wire.

So we mount the LH wire in a non-shielded vantage point, doesn't matter if the RH wire is completely hidden. Focus on the LH wire being visible for less frame loss.

Augur., are you on a white spot Rx?

[georgi UK]

=] Omer is mind reading again!!

[Xrayted]

Yes, and this is what I did as well. If one whisker must be blocked when mounted, make sure it its the right side

[omerco]

Originally Posted by georgi UK

=] Omer is mind reading again!!

G minds think alike

[A VIKING]

I have all the whiskers exposed.
Did the same thing with rolling it around trying to find the blind spot.
Looked good to me and I have 2-3 frames lost per flight.

Interesting stuff.
Thanks for all the insight.