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Old Apr 20, 2011, 06:48 AM
Blue Falcon
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Dipoles for 2,4Ghz Receivers

Today I have tested my new 2,4Ghz dipole antennas. I use the Frsky telemetry. If the model comes close to the end of range the telemetry will give you an alarm by a bieb from the rc tx. If using a video TX on board the range will drop enormously. Using original Frsky antennas the max. range for my model was about 200 meter. So I changed the original rx antennas for home made dipoles. Just that simple gives you about 3-4 times more range. If using a better antenna for your rc tx, you can fly several kilometers without any problem. So, today I made a video of the results.


Test Frsky Receiver Folded Dipole (4 min 22 sec)


Robert.
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Old Apr 20, 2011, 11:53 AM
I tell her RC is cheap !
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Can it work with spektrum receivers ? If so, how do you conenct it ? And where do you buy the antennas ?
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Old Apr 20, 2011, 12:01 PM
Blue Falcon
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It should work with spektrum receivers too. I just do not know how the antenna's connected to the print of a spektrum receiver, do you have any pictures?

Soon I will make a few antenna's more and will place pictures how to make them yourself.
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Old Apr 20, 2011, 12:55 PM
I tell her RC is cheap !
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This one is from a park flyer AR6100 receiver, I believe the long range receiver antennas should be attached the same way ( not my pic) ?
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Old Apr 20, 2011, 01:50 PM
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Quote:
Originally Posted by bluefalconhollan View Post
Today I have tested my new 2,4Ghz dipole antennas. I use the Frsky telemetry. If the model comes close to the end of range the telemetry will give you an alarm by a bieb from the rc tx. If using a video TX on board the range will drop enormously. Using original Frsky antennas the max. range for my model was about 200 meter. So I changed the original rx antennas for home made dipoles. Just that simple gives you about 3-4 times more range. If using a better antenna for your rc tx, you can fly several kilometers without any problem. So, today I made a video of the results.


http://www.youtube.com/watch?v=qO3sGDkHUYg

Robert.
Be careful with 900 mhz VTX close to the FrSky receiver it can drastically reduce the range.
On the fist test of my system (FrSky + 900Mhz VTX channel 4) I had a lot of failsafe at 100-200mt.
Adding some distance between VTX and rx (40cm more or less) and twisted video cable now I fly to 1.5km with standard antenna and 2.2km with the +5db (I think the range could be little bit more, this is the maximum with my 900Mhz 200mw VTX with standard antenna and 8db patch on VRX).

Now I have to test the FrSky patch, I hope to fly without poroblems to 3-3.5 km...

we will see
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Old Apr 20, 2011, 01:54 PM
I tell her RC is cheap !
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Originally Posted by not103 View Post
Be careful with 900 mhz VTX close to the FrSky receiver it can drastically reduce the range.
On the fist test of my system (FrSky + 900Mhz VTX channel 4) I had a lot of failsafe at 100-200mt.
Adding some distance between VTX and rx (40cm more or less) and twisted video cable now I fly to 1.5km with standard antenna and 2.2km with the +5db (I think the range could be little bit more, this is the maximum with my 900Mhz 200mw VTX with standard antenna and 8db patch on VRX).

Now I have to test the FrSky patch, I hope to fly without poroblems to 3-3.5 km...

we will see
Wow ! I get good signal with spektrum 2,4 up to 2500 feet, but after that it is not safe, lots of drop out.
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Old Apr 20, 2011, 02:23 PM
NDw
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Excellent results blue. I presume these along with a low pass filter should give very good results.
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Old Apr 20, 2011, 02:23 PM
Blue Falcon
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@carguy1994ca: I do not know how to connect a dipole to that receiver. The frsky has 2 U.fl connectors.

@not 103: do you use the frsky telemetry version? I add distance about 60 cm between VTX and frsky receiver.
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Old Apr 20, 2011, 02:35 PM
I tell her RC is cheap !
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Excellent results blue. I presume these along with a low pass filter should give very good results.
What is a low pass filter ? Is it like a LC filter ?
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Old Apr 20, 2011, 02:42 PM
Blue Falcon
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A low pass Antenna filter is used to reduce the unwanted harmonics on wireless video transmitters. Ideal for reducing the video transmitter's radiated EMI / RFI (RF noise) that often causes interference to nearby electronics.

I also used in the past a low pass filter but without any result.
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Old Apr 20, 2011, 02:43 PM
I tell her RC is cheap !
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Originally Posted by bluefalconhollan View Post
A low pass Antenna filter is used to reduce the unwanted harmonics on wireless video transmitters. Ideal for reducing the video transmitter's radiated EMI / RFI (RF noise) that often causes interference to nearby electronics.

I also used in the past a low pass filter but it didn't help at all.
Where can you buy one for 900 mhz ?
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Old Apr 20, 2011, 02:44 PM
Blue Falcon
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Originally Posted by carguy1994ca View Post
Where can you buy one for 900 mhz ?
http://www.nghobbies.com/cart/index....roducts_id=564
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Old Apr 20, 2011, 03:19 PM
I tell her RC is cheap !
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Thanks !
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Old Apr 21, 2011, 04:25 AM
Martin - AKA mr.sneezy
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Where from ?

Hi Blue Falcon, where did you buy the dipoles from, or did you make them ?
Martin
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Old Apr 21, 2011, 04:36 AM
Blue Falcon
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Martin,

I make the folded dipoles myself, a tutorial comes later. Eventually if there is enough interest I can make a set for 26 dollar.

Robert.
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