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Got Jet Fuel? Turbine Helicopters > Which Way Do You Run Antenae??
 
 
Peter G
Senior Heliman
Location: Runcorn, Cheshire, UK

I have a pod and boom Turbine, using HP5 mechanics, with a Jetcopter undercariage.
When I do a range check withe my TX aerial down, I only have to walk 3 metres and the servos go wild.
The Rx is at the front of the mechanics, on top of the ECU, then the wire runs down the front and along the Metal undercariage, inside a tube, I have also changed the tube for a "Heli-Mast", but still the servos go wild, at 3 metres.
The only way I can stop this is to move the RX wire away from the heli.
It appears the metal frames and metal undercariage are masking the signal.
I am using a PPm RX(I know use PCM), but surely I should eradicate all glitches first?
Were doyou chaps place your RX and which way do you then run the wire.
I am at the moment scared to fly it, and would also like to solve this before it goes in a scale fus.
Please Help.
Thanks
Peter G
10-06-2003 Over year old.
HOMEPAGE  
 
 
Doug
Elite Veteran
Location: Naples Florida....

I don't know if it's your problem but the turbines (due to the high airflow) generate a high static charge and if everything is not electrically bonded could be part or all of the problem.

First member of Member of Bearings Anonymous
10-06-2003 Over year old.
 
 
Peter G
Senior Heliman
Location: Runcorn, Cheshire, UK

Doug
What exactly do yo mean when you say everything must be electrically bonded?
I see this alot.
Cheers
P.S
The problem even happens when the engine is not running.
10-06-2003 Over year old.
HOMEPAGE  
 
 
Doug
Elite Veteran
Location: Naples Florida....

All metal parts need to be connected to all other metal parts Since "carbon" is conductive (but covered in a thin layer of epoxy) it is especially important to make sure you have an electrical connection of no more than a few mili ohms.

First member of Member of Bearings Anonymous
10-06-2003 Over year old.
 
 
Phil Cole
Veteran
Location: Redwood City CA

The ECU is potential source of RFI. Jetcat claim to have designed their ECU so that it is relatively quiet RF-wise but putting the receiver right on top and then running the antenna parallel to the ECU-engine wiring doesn't make like easy for the receiver.

You can test whether the ECU is a problem by comparing range tests with and without the ECU running. Unplug the ECU from the receiver, or disconnect the ECU battery to disable it.

I have my Jetcopter receiver mounted on the top of the frame, just above the tail drive coupling. The antenna runs from there to the horizontal fin. At both places, the antenna wire is supported 1/2 in. away from the helicopter by a cable tie.

I get the longest range test of any helicopter I own this way. I test it with the ECU powered, but without the engine running. I have had two receivers in the Jetcopter (R148DP and R149DP, on 50 MHz) with similar results. My other helicopters all have more than adequate range, but the receivers are mounted at the front, with the antenna running parallel to the bottom of the frame about an inch out on the struts and then to the fin.

I have seen other installations with the receiver at the back, like mine, but using a loaded whip antenna pointed rearward. Others mount the receiver on top in front of the mask, with a whip inside the canopy. Both of these arrangements seem to work OK.

I don't know anyone who's used PPM, even to debug an installation. You can expect about half the range with PPM, compared to PCM, so three metres does seem rather short.
10-07-2003 Over year old.
 
 
DStJohn
Senior Heliman
Location: Ft. Collins, CO

I have about the same setup as Phil, I have my rx mounted on the rear, as far away from the ECU and the solenoids as possible. Unlike Phil, I am running a Deans antenna stuck to the frame below the rx and angles back and up. I am on 50 Mhz with a JR 955 PCM rx and can get 60+ paces both with and without the engine running.

Dan St.John
East Coast Scale Helicopters Vario Field Rep
10-07-2003 Over year old.
 
 
midwestpilot
Elite Veteran
Location: Crystal Lake, IL

jetcopter

We kept the rx away from the ecu and ran a long antenna tube on the top side of the frames to the tail boom...no problems

In life there is no spacebar!

Rich Erikson AMA 6175
10-07-2003 Over year old.
HOMEPAGE  
 
 
Twobeers
Key Veteran
Location: Toronto, Canada

No No! Don't run it on or near any metal. Yes put it in a tube. But a 3 1/2" tie-rap on the antenna tube, put one on the tail brace. Clip the tie-raps so that they are sticking out about 1 1/2". Join the tie-raps together with a piece of 1/8" fuel tubing. Repeat as required. And don't forget, the batteries have metal cases, keep antenna leads away from them also. As a matter of fact, put a piece of fuel tubing ahead of the plastic antenna tube all the way to the reciever, this will keep the down draft from sucking the antenna out of the tube besides offering a little bit of protection and it looks cool too. Keep the antenna away from all metal surfaces at least 1 1/2". Carbon fibre has very little effect upon the radio reception BTW.

I lost my infamous tag line.
10-07-2003 Over year old.
 
 
midwestpilot
Elite Veteran
Location: Crystal Lake, IL

Not following...

Twobeers...could you post a photo?

In life there is no spacebar!

Rich Erikson AMA 6175
10-08-2003 Over year old.
HOMEPAGE  
 
 
midwestpilot
Elite Veteran
Location: Crystal Lake, IL

We have ours like this....



with no problems...

But I am interested in your method...I just cant picture it in my mind

In life there is no spacebar!

Rich Erikson AMA 6175
10-08-2003 Over year old.
HOMEPAGE  
 
 
Sandy S.
Heliman
Location: FLORIDA USA

we normally run our wire in a loop around the front end(nose) of the heli, this gives the best reception at all attitudes.
10-08-2003 Over year old.
 
 
optikaman
Veteran
Location: EnglishTown N.J.

Antenna routing

I have my base loaded antenna mounted to the rear upper frame support, you can see it in the photo. i have 50 flights so far with out any problems. My ECU has recorded no failsafe conditions.....



Alan...

10-10-2003 Over year old.
 
 
MISHA
Heliman
Location:

Looking for head button

Guys I'm looking for a head button for a fury. The one I saw was silver and and various holes around it. Looked preatty funky. If you have one for sale send me a pic and let make a deal.. dschiazza@shaw.ca
10-10-2003 Over year old.
 
 
optikaman
Veteran
Location: EnglishTown N.J.

Head Button

Here is a link to the guy making the head buttons you are talking about.


Head Buttons




Alan..
10-10-2003 Over year old.
 
 
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Got Jet Fuel? Turbine Helicopters > Which Way Do You Run Antenae??
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