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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> JR Radio & Spektrum Radios >> Problem with telemetry when using Spektrum GPS?
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Problem with telemetry when using Spektrum GPS? - 12/11/2012 2:15 AM   
SkidMan


 

Posts: 222
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Joined: 4/26/2010
Last Login: 4/24/2013
From: Oviedo, FL, USA
Status: offline 		After adding a Spektrum GPS to my TM1000 I started having intermittent telemetry problems. Everything would bind up just fine and I'll receive accurate telemetry but after a seemingly random period of time all telemetry will cease and I’ll get a flat line instead of the telemetry signal strength bar-graph on both my DX8 and STI module in a iPad – usually after just a couple minutes, but sometimes well into a flight.

 

Steps I’ve taken to this point:

  1. Swap out the TM1000 module – No change
  2. Swap out the AR7000 – No change
  3. Swap out the 2nd AR7000 for a AR9000 – No change
  4. Disconnect the RPM input – No change
  5. Disconnect the Voltage/Temp input – No change
  6. Disconnect the X-Bus lead going to the GPS – Telemetry works reliably
  7. Reconnect RPM, Temp/Volt inputs – Telemetry continues to work reliably
  8. Reconnect the X-Bus to the GPS – Problem reappears (Telemetry works for a short time and then quits)
  9. Disconnect the X-Bus lead going to the GPS again – Telemetry works reliably
  10. Reconnect the X-Bus to the GPS again – Problem reappears
  11. Disconnect the X-Bus lead going to the GPS again – Telemetry works reliably

Even though the telemetry would disconnect all other radio functions work without a problem.

When the telemetry stops working it stops on both the DX8 and the iPad with STI module.

The GPS is mounted aft of all other electronics with the label side up.

Until I added the GPS the radio system and telemetry worked flawlessly. Afterwards I started having problems.

 I’ll follow up with Horizon tomorrow but I wanted to know if anyone else was having any problems like this or if there was a known solution.

 

Thanks,
Paul



< Message edited by SkidMan -- 12/11/2012 2:51 AM >

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RE: Problem with telemetry when using Spektrum GPS? - 12/11/2012 4:34 AM   
Len Todd


 

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Status: offline 		You might want to consider dropping Andy a PM. I would bet  that the Techs on the HH phone are not going solve the problem, unless they send you another GPS module and the new module works. They will probably want you to send it back into them for repair.


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RE: Problem with telemetry when using Spektrum GPS? - 12/11/2012 4:12 PM   
SkidMan


 

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quote:

ORIGINAL: Len Todd

You might want to consider dropping Andy a PM.  ...



Good word. Will do.

Paul



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RE: Problem with telemetry when using Spektrum GPS? - 12/11/2012 4:30 PM   
AndyKunz


 

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From: White Heath, IL, USA
Status: offline 		I suspect an issue with the wiring. The GPS modules are very reliable, but connectors are very high on the "probables" list for any system.

Try this on a short (6") cable between GPS and TM1000.

How do you have the wiring strain-reliefed at the TM1000 and GPS? On my models I glue the wires to the airframe an inch or two from where they plug in. I do this for remote receivers, too. I also like to put a few drips of tool dip onto the connectors at the wires, just to help support things better.

Andy

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RE: Problem with telemetry when using Spektrum GPS? - 12/11/2012 4:49 PM   
SkidMan


 

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From: Oviedo, FL, USA
Status: offline 		Thank you for some good ideas Andy!

The GPS cable is currently zip-tied within a short distance of the TM1000 but I will better support it at both ends. A cable connection could explain the behavior of the timing of the loss of telemetry.

I'm sure that I'm using a relatively short cable, but I am unsure as to its actual length. It is the stock cable.

After flying with telemetry for some time I really miss it when it drops out!

Andy, thank you again for your amazing support of Spektrum products! 

Paul


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RE: Problem with telemetry when using Spektrum GPS? - 12/11/2012 6:20 PM   
AndyKunz


 

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Status: offline 		If you have another cable, try using it and see if the problem persists.

Cables are great until you have connectors on the ends ....

Andy

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RE: Problem with telemetry when using Spektrum GPS? - 12/11/2012 9:27 PM   
SkidMan


 

Posts: 222
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From: Oviedo, FL, USA
Status: offline 		I have a friend that has an altimiter and g-force module. If I continue to have problems I'll try to bum one off him when he returns in a couple weeks.

This all is assuming that a problem with a cable on the X-bus can take down all telemetry.


Paul



quote:

ORIGINAL: AndyKunz

If you have another cable, try using it and see if the problem persists.

Cables are great until you have connectors on the ends ....

Andy



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RE: Problem with telemetry when using Spektrum GPS? - 12/13/2012 11:38 AM   
Franco2fly


 

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Status: offline 		I'm curious as to how you are using the GPS data.  Could you say a few words on why you like it and how you are using it.  For myself, I can find very little usefulness, although I have two units in two very different aircraft.  The only way I have found to use the data is in a replay of the day's flights.  But I pretty much knew where I was flying so there were no surprises.  Maybe if I could do a replay and watch the GPS data plotting while at the same time see RPM, Altitude and G-force (I listen to the audio in playback) I could draw some conclusions.

Its nice to have an actual output showing that my flights stay over our Flying field, but once you see the output, subsequent flights really don't provide any new information.

KKKKFL

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RE: Problem with telemetry when using Spektrum GPS? - 12/13/2012 3:16 PM   
SkidMan


 

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quote:

ORIGINAL: Franco2fly

I'm curious as to how you are using the GPS data. 
...


At this point, other than the basic curiosity side of things, like being able to say for sure that I've not overflown the field's neighbor's property, I haven't found it too useful. Max speed and altitude are interesting, however.

I'm hoping that Spektrum will continue to release enhancements to the software to make it more useful. I consider the ability to export the GPS data to a KLM file for importing into Google Earth a must.

For sheer data usability the Eagletree system is far more useful at this point - think how useful it is to be able to plot throttle position, RPM, cylinder temp, and airspeed against each other for tuning or prop selection.
You can read the  Eagletree GPS data into Google Earth and view your flight in 3 dimensions (I'm counting on Spektrum releasing this capability)
While I haven't done it I understand that you can plot the antenna fades, faults, and holds on the GPS flight path. The drawback is that it is not real time telemetry.

Punchline, I'm not rushing out to buy another GPS module yet.


Paul



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RE: Problem with telemetry when using Spektrum GPS? - 12/13/2012 4:08 PM   
Franco2fly


 

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Status: offline 		Good summary.

I just didn't want to think that I was somehow overlooking something.  So far the playback feature is nice for reviewing flights long after the day is done, but I haven't been able to find the collection really worthwhile...  Real time, I like knowing my approach speed and altitude via the audio output of the iPhone...  I am making more consistant landings, not by alot, but I have seen smoother touch downs and I'm less likely to go long.

Prior to take off, the RPM readings give a little warm feeling that the engine is performing just as it did the previous weekend, but here too, it is not a big improvement over my Earbone.

I've been pumping data to the SD card, but until there's software to pull the data into an Excel spreadsheet, I don't see much utility.  Still, it has come a long way and I believe there is potential.  Throttle position, might be a good first start, but I would really like to track Airspeed, in conjunction with Flap deployment and Elevator position, as well as Aileron might be needed before I can start to make some sense of what went on.

Keep the collection going and we'll stumble onto something before too much longer.


KKKKFL

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RE: Problem with telemetry when using Spektrum GPS? - 12/13/2012 4:30 PM   
SkidMan


 

Posts: 222
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Joined: 4/26/2010
Last Login: 4/24/2013
From: Oviedo, FL, USA
Status: offline 		While I haven't found much use for the GPS with its current functionality I've discovered that I really like the telemetry in general: data log of fades, faults and holds, temperature, and voltages.

I've had a possible cable problem that I'm hoping to get straightened out and I really miss the telemtry when it isn't working.

Paul


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RE: Problem with telemetry when using Spektrum GPS? - 12/13/2012 5:11 PM   
Franco2fly


 

Posts: 629
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From: Springfield, VA, USA
Status: offline 		Don't get me wrong...  I am totally addicted to the iPhone voice in my ear speaking airspeed, and Altitude.  I used to have RPM and voltage too, but dropped them in favor of temp.  Temp comes in handy on the electrics where I have the sensor wrapped around a 60 amp ESC.  If I go into hover, or other extreme aerobatics, it doesn't take long tor the temp to exceet 100 degrees.  I usually back off and let the ESC cool down..  On a nitro, there's not a whole lot you can do, or need to do.  What's the worst that can happen.  It is surprising at how HOT the head gets,   I suppose over time it might be good data to have.

KKKKFL

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