Jim,

I hope you and you family are well.

I had a failsafe event today with an airplane equipped with an RFU and an X10+ V2. 

I was flying through a stall turn about 200 feet away.  The airplane yawed to the left over the top and was flying downward with the top of the airplane facing me.  The throttle was as a low-to-medium setting at the time.  I started to pull out when the plane pitched up and continued until it was facing nose high, like it was trying to fly a loop.  I did not command that additional up elevator, I was just going to level out.  I recovered airspeed and continued flying it.  It was only a momentary event, lasting a second or two.  I felt that something went wrong so I immediately landed safely.

With the airplane safely on the ground I remembered that my failsafe commands are:

   THROTTLE OFF and
   ELEVATOR UP

Since the throttle was relatively low during the maneuver I did not notice that the throttle may have gone all the way off, but I did experience the up elevator.

I reckon that it was not a power problem because the up elevator went into effect.

My theory was that the RFU antennas were blocked by the airplane's battery and wiring at the "perfect" angle.  I verified it by taping the "range test" button down and walking far enough away to cause a failsafe.  Than I moved in a few steps to where the controls were solid.  Then I oriented the airplane around to various orientations relative to the transmitter (which was sitting still on a chair) and found an angle that caused the system to go into failsafe.  The angle was similar the orientation at the time of the stall turn maneuver.

Only thing - now this gets eve weirder:  My failsafe was set up to put the elevator DOWN, not UP!  I must have not set the failsafe again after putting the X10 into the new plane.  But I felt an uncommanded UP elevator control.  I have no good explanation.  Maybe power?  Maybe the flight battery shifted aft while the plane was going up into the stall turn?

I do not like my current RFU antenna installation because while both antenna elements are oriented 90 degrees to each other, they are both situated horizontally (picture attached).  I reckon with both horizontal, they both could be blocked in the same geometric plane.

I will relocate the RFU and its antenna elements so that one element faces downward and the other faces in a horizontal direction.

Do you agree that this was not a power problem because the servo moved the the failsafe position?  (I'm not ruling it out.)  The airplane uses a Castle BEC regulator set to 5.2 volts.  How about the horizontal and vertical antenna orientation?

Thank you,

Paul

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What would be a good (pin and flag) switch for the XPS 16? 
Also can the X16 Oled be relocated like the X24?

     Thank You.

I'm using the JR module with the RadioMaster Tx16s running EdgeTx 2.7.  Twice during the binding procedure the radio went into "emergency mode".  After successfully binding a Nano to the module I cycled the power on the module, not by cycling the power on the radio but by selecting the "off" option then the "XJT" protocol for the external module.  This will cycle the power on the module but twice, out of about a dozen bindings has put the radio in emergency mode.  Normal operation is returned by cycling the power of the radio.  Not sure if this is a problem or not.

are you out of the RX business?
ron

I have several nano receivers.  It appears the antennae are glued on the front of the board and soldered to the back.  On one of mine the antennae came unglued and over time the wires seem to have frayed.   Its hard to tell if some of the strands are broken, even looking through a magnifying glass but the wires feel weak like they could break off.  I thought about adding solder to the front of the board but if the strands are broken its very close to the wire insulation.  Can these antenna wires be replaced?

Attached is a pic I took this evening.  Thinking of adding solder up to the insulation and gluing the antenna back to the board.

   

Firstly, no problems with XPS 2.4 module with any Rx.
Or a well known European dedicated 2.4 brand flying concurrently.

Maybe we can get a view from your knowledge.

This is out of the ballpark, but some are having trouble with loss of signal to Rx on Tx16S internal configuration.
Total loss of control and spiral in from level flight. Failsafe set on one occasion only, so doesn't seem a factor.
Doubtful that the Tx is a problem, common to 3 different Tx's.
Just who is using our R/C bandwidth? Everything from toys to licensed UAV. 
Increasing 2.4 activity in a rural zone, farming, water control, etc, etc.

Possible causes, band width, batteries.

1. Batteries are a well known make, A123 type with internal charge control, not dual, load test OK after crash.
2. Many flights successful prior to crashes.
3. Postulated that 2.4 is becoming overused, and users are running out of band wriggle room. 

So, do you have any views on producing dual band 2.4/9 mHz or just 9 mHz to improve the odds.
Or is this dual band idea just a blind alley, down which we don't need to go?

Regards,

Hi,

Need more channels.
Radiomaster TX16S in XJT can output 16 channels.
J1 Module handles this, that's great.
Radiomaster TX16S in PPM can output 16 channels.
Recall that the J1 Module will only handle 8 Channels. 
To refresh my memory is this correct?
I can't find a reference to it, time to update notes.

Regards,

Trying to find a use for a good JR11xZero.
I need 10ch to an X10/16, but as I understand only 9ch can be output from the current JR module using PPM9.
10ch can be output using SPCM, but the according to the doco the module can not handle the modulation.
Was ever an upgrade done to enable this?
Also does the RFU accept SPCM?
Assumed that Nano's won't.

Rather think that this may be the end of the road for my JR Tx, but modules work well in Taranis/Radiomaster.
Seems like Tx modules might be a dying breed


Regards,

Apologies if this has been asked and answered but I didn't see it here.

The new FrSky X20 series of radios did away with the JR module bay and now have what they call a "Lite" module bay which is smaller.

I am currently using an X10S with your JR module and Nano's for receivers in it, but I'm locked out of that arrangement with my new X20S.

Does XPS have any plans for a TX module that will fit the Lite module bay of the X20S?

Good day everyone and Jim, I'm happy to be back here. I have been flying a lot though. Been practicing the P23 pattern schedule as much possible. 
Please advise if xps have an internal module for a JR XG8 TX. I don't have a XG8. I'm asking for a friend who is having problems with some sort of lockout issues. 
. I also see that the XG8 TX battery is only a 2 cell life. Seems od to me that a TX would use such a low voltage.?

Many thanks all.