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HelicopterRadio - JR DMSS › XG14 range test
11-27-2017 12:40 AM  14 days agoPost 1
Antsis

rrApprentice

Melbourne, Victoria, Australia

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Hi Guys

Does anyone know the maximum distance the XG14 will lose signal when at low power?
The manual states 40m for the range test, but I got erratic servo movement at 40-50 paces. This was on a model that previously still had good connectivity from much further away.

Ant

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11-27-2017 01:13 AM  14 days agoPost 2
EEngineer

rrProfessor

TX

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Did you use the exact same orientation and in the same location in both cases?

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11-27-2017 02:19 AM  14 days agoPost 3
Antsis

rrApprentice

Melbourne, Victoria, Australia

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Hi

Yes I did.

Ant

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11-28-2017 01:52 AM  13 days agoPost 4
Four Stroker

rrElite Veteran

Atlanta

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BECs and switching regulators will greatly reduce range. Try it with a battery. A bad servo will also put noise on the RX power bus.

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11-28-2017 03:01 AM  13 days agoPost 5
Antsis

rrApprentice

Melbourne, Victoria, Australia

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Model has 2 x 6V 2000mA NiMH packs through a BoomaRC pin switch. Tried on another model which uses a 2S lipo through a JR HD switch. The range was slightly better on this model.

I am concerned there may be an issue with my Tx.

Ant

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11-28-2017 03:53 AM  13 days agoPost 6
EEngineer

rrProfessor

TX

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I am concerned there may be an issue with my Tx.
Well, for peace of mind, perhaps you should send it in for service....with a note explaining your exact situation.

I realize that's inconvenient....but a crash due to this issue would be much worse...

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11-28-2017 07:08 AM  12 days agoPost 7
Heli Fanatix

rrVeteran

Fountain Valley, CA

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How is your antenna positioned?

Try folding it to left or right

- Scott

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11-29-2017 12:08 PM  11 days agoPost 8
Four Stroker

rrElite Veteran

Atlanta

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If you tried the range test with two separate receivers, AND the range has dropped off from before, then something ain't right with the TX. As I recently discovered, these 2.4 GHz modules age and the power drops off - 10dB. Futaba does not service TM14 modules anymore so if you have a 12FG, 12Z, 14MZ with this problem, you are screwed.

The other problem is that the U.FL antenna crimps can go bad from twiddling your antenna. I leave my antenna in the same position stored in box of flying for this reason. When you move the antenna, you twist the micro coax right up to the crimp.

Of course other crap can go wrong like the voltage regulator to the RF deck.

Send it in for service!

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11-29-2017 05:11 PM  11 days agoPost 9
EEngineer

rrProfessor

TX

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Try folding it to left or right
Yeah, that'll work for sure.....

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12-01-2017 06:17 AM  9 days agoPost 10
Heli Fanatix

rrVeteran

Fountain Valley, CA

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hey wanna be engineer,

The reason why you fold the antenna is to:
- reduce chance of signal fade/dead spot
- the sides of the TX antenna is what transmit the strongest signal path

So if your TX antenna is pointing straight out and facing side of RX antenna
- could result in a weak signal
- sides of TX antenna towards RX antenna face for optimum results

Also what Four Stroker mentioned is informative and great insight!

Advising folding the antenna to the left and right
- is an option for trouble shooting
- give it a shot
- I will take less time to try than to write this post
- not a suggestion to not send TX in for service.

Quit reply with ignorant comments. Now I can see why so many members put you on their ignore list.

- Scott

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12-01-2017 06:42 PM  9 days agoPost 11
EEngineer

rrProfessor

TX

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sides of the RX antenna is the worst angle for reception
You couldn't be more wrong....where did you learn antenna theory?

In addition, when you fold your antenna, the "tip" does NOT point at the aircraft as you claim....it points away, or rather it's "side on" to the aircraft.

Off the tip of a horizontally polarized antenna is a "null"....and off the sides is where the gain is best....jeez, what is your deal?

BTW, HF I don't take orders from you....and, I don't need any of your worthless theoretical advice....

So chill out and have some more beer....lol

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12-01-2017 07:37 PM  9 days agoPost 12
Heli Fanatix

rrVeteran

Fountain Valley, CA

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Is this how you communicate?
- Maybe you are the one that needs to chill out
- Noticed you tried to delete the message after you realized what you did.
- Learn from this and don't do it next time

BTW
Welcome to my ignore list. Awesome feature Mark!

- Scott

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12-01-2017 09:19 PM  9 days agoPost 13
EEngineer

rrProfessor

TX

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Yes, HF....get off my back!

You're the one that rides my back.....as you have others....at any time....with your silly nonsense....much of which has little basis in fact.

You just want to start an argument.....over nothing.

Find somebody else to harass.

Don't PM me....and don't send me your emails...again.

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12-02-2017 06:29 AM  8 days agoPost 14
EEngineer

rrProfessor

TX

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HF, you remind me of your hero "towpilot"....

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12-03-2017 11:02 PM  7 days agoPost 15
Antsis

rrApprentice

Melbourne, Victoria, Australia

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Tried with two different receivers.

The Tx antenna position is always the same and the Tx lives in a JR upright case.

The whole context of my question was to see if anyone actually knew the max distance before losing the signal. My DX9 still has good connection at the same distance.

I emailed both our Aus dealer and JRAmericas. Their suggestion was to send it in for checking.

Ant

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12-03-2017 11:21 PM  7 days agoPost 16
dgoss999

rrApprentice

UK - Lancashire

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There is a small company here that make a cheap tool here in the UK that may help you..

http://modelradioworkshop.co.uk/sho...output-checker/

It's not a direct measurement tool, just an indication of the 2.4 Ghz signal strength

DG.

"Believe none of what you hear, and only half of what you see." • Benjamin Franklin

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12-04-2017 05:17 AM  6 days agoPost 17
EEngineer

rrProfessor

TX

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Their suggestion was to send it in for checking.
That was my suggestion many posts previously....

Why take the chance of not having it checked?

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12-05-2017 04:42 AM  5 days agoPost 18
Four Stroker

rrElite Veteran

Atlanta

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The "tool" that is mentioned above is nothing more than a repurposed microwave oven leakage measuring device. Another guy on here has been using one of these for many years to crudely check for TX power output. The microwave oven spectrum is the 2.4 GHz band. My oven is exactly centered. Some are on the high end.

If you can find someone with a real or cheap spectrum analyzer like the popular WiSpy, you can compare your TX to someone else's. I have compared everyone at my field and the results were amazing. There was a 30 dB spread. Now if the best were putting out 100 mW, the worst were putting out 1/10 of a milliwatt. Some of these have since been replaced. If the button for range test is broken, you are in permanent range test mode ! If you twist the antenna around and around because the stop is broken, you can be down 30 dB.

I actually have an XG14. The range test power is down 35 dB from full power. Futaba FASST is down 23 dB from full power. So every TX will not give the same range test. I get 200 ft. and run into a barbed wire fence. So I don't actually know the max. range. There are snakes and ticks on the other side.

JR Americas should have test equipment to check out your RF deck and antenna directly. It is winter. A good time to send it in.

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12-05-2017 03:26 PM  5 days agoPost 19
doorman

rrProfessor

Sherwood, Arkansas

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Send It In!!!

Turn it loose and let the pros check it out for you!!!
Never seen one get better during a flight!!!
Sran

AMA 2918-Team JR, Spin Blades, East Coast Scale Helicopter,Castle Creations

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12-05-2017 03:38 PM  5 days agoPost 20
EEngineer

rrProfessor

TX

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It is winter. A good time to send it in.
Except, in Australia right now, it is summer......the seasons there are opposite from ours.

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HelicopterRadio - JR DMSS › XG14 range test
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