Jim,

I was thinking about the latency in my RC systems.

I believe that my Futaba 9C transmitter delivers a new set of channel positions by way of PPM to the XPS transmitter module every 22,5 millisecinds.

Using the XJT-D16 protocol the Taranis delivers a new set of channel positions to the XPS JR-type module every 18 milliseconds.

This means I gain about 4.5 milliseconds using XJT-D16.

If I happened to be using all 16 channels I would be about twice as fast with XJT-D16 than I would be with PPM.

Is that correct?

Thanks,

Paul

Jim,

On the RFU's coax antenna leads, what is the minimum bend radius that will not cause any reduction in signal strength?

I understand that the bare tip must be kept straight, and that the angled antennas must be at least two inches apart.

Thanks,

Paul

Jim,

X16 setup. TX16S. Have set up all ch OK.
Not getting the sequencers I want.
Retracts and doors, Ch 5 on 3 pos switch.
X16 Ports A2 and B2 output from Ch 5.
Servos work OK.

Now to the sequencer: Trigger at 1500.
Tx Ch 5 Sw up Seq#1 triggers doors down. Port A2
Tx Ch 5 Sw up Seq#2 triggers gear down.   Port B2
Not set up yet.
Tx Ch 5 Sw dn Seq#3 triggers gear up.        Port B2
Tx Ch 5 Sw dn Seq#4 triggers doors up.      Port A2

When all sequencers disabled, servos work. Expected.
One enabled, wrong servo works.
Both enabled, nothing works.

So tried duplicating Ch5 as Ch13 in Tx.
Ch 5 Seq#1  doors down. Port A2
Ch 13 Seq#2 gear down.  Port B2
Same thing.  Tx outputs do show in X16.

From reading the X16 manual am I misunderstanding the process?
Quite possible.
Can set it up from the Tx, but reckon that the X16 should do it too.

Cheers,

Jim,
When are you getting more in stock. Want to convert my Heathkit single stick radio.
Bob

Hello Jim. I wanted to know if you think using the X10+ is ok for use in a 120cc 3D aerobatic plane. I have two of them and before I buy another X24, I was hoping I could use the X10+ instead.

Thank you in advance.

Regards,

Robert

Jim,

I am considering a new transmitter and I would want one that could talk to XPS transmitter modules, receivers and channel expanders with the most direct, efficient protocol.

I have a vague recollection of a post somewhere in the old forum that states that one brand of transmitter used a protocol similar to your Xtreme protocol.  I cannot find it using the search.

Can you recall what may have been posted about this possibility?

Thank you,

Paul

I have just installed the JR Tx module into my Taranis, trying to go thru the radio setup.  I have set it to the external module, PPM, and it is asking for the frame rate.  It is showing 22.5ms, 300u.  I assume this is correct?  I have not found this addressed anywhere.

JimDrew;47010367 Wrote:Did you change the EPA after doing the AutoMatch?  You can’t do that.  You have to make sure that you set the end points prior to the AutoMatch and not change them afterwards.  You can change the trim,  but not the end points.

It could be that you are over-driving the surface,  and the hinge line is binding.  What servos are you using where you would need to unplug the slave?

Please note that we are not using RCGroups anymore for support.  Please use our direct support forum here: 

https://www.xtremepowersystems.net/forum/

Jim,

I have a perfectly working Nano/X10+v2 setup with a Jumper T12 Pro transmitter running OpenTx 2.3.10 and XPS XJT-J1 firmware v4.4.

I wanted to use the X10+v2 in another plane so I replaced the Nano/X10 with one of my older 8-channel XPS receivers.

I first used the push button method to set the factory defaults in the 8-channel receiver.  Then I verified the country code was #1 for USA.  Then I configured all of the channels for failsafe user-settable.

The 8-channel receiver binded successfully to the transmitter and all of the servos worked, until I noticed some random loss of control on all channels.  I first thought I had the transmitter located too close to the receiver and was swamping the receiver, but that was not the case.  I moved to about ten feet apart and still observed the random loss of control.  With the range check button on the Tx module pressed I could get no more than about one foot of effective range!
 
I tried another older XPS 8-channel receiver with the same loss of control result.

Then I tried the Nano/X10 again and with the same transmitter it worked perfectly.

Then I tried binding the older 8-channel XPS receiver to my Futaba 9C transmitter with its XPS Tx module and it worked perfectly.  That gave me an idea:

I configured the Jumper T12 and XPS-J1 module to use PPM instead of XJT-D16 and it now worked perfectly with the older 8-channel XPS receiver.

So I think there is some incompatibility between the older XPS 8-channel receiver, and OpenTx, XJT-D16, XPS-J1.

What do you think?

Thanks,

Paul

(yes it was raining all day so I had time for this sort of thing)

Hi Jim,

I've been flying a foamie that is setup like a miniature bush plane with a four servo wing for flaps and ailerons.

Ch1 = Left aileron
Ch2 = Elevator
Ch3 = Throttle
Ch4 = Rudder
Ch5 = Right Aileron
Ch6 = Left flap
Ch7 = Right flap

Because I needed seven servo outputs I installed a Nano Rx and an X10+(V2) in the plane and all works perfectly.  But now I want the X10 for a different project.

I am thinking about installing instead an original 8-Channel XPS receiver.  With weight at a premium in the little foamie, could I remove the 8-Channel receiver's case and still use it safely?

Thanks,

Paul