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Windbreaker · 03-17-2012, 08:44 PM

I was having all kinds of multipath interference problems where I fly. There's a large baseball backstop made of chain link fence, plus a dugout with a metal roof behind me.

Even at close range (less than 100 feet) I got tons of dropouts and static using various dipoles including the Inverted Vee.

This was at 900 MHz and 1.3 GHz.

I also tried an Eagle Tree diversity receiver without much luck. It just switched from a bad signal to the other signal that wasn't quite as bad.

I switched over to a Bluebeam skew planar (another IBCrazy design) using the 1.3 GHz transmitter. Same receiver. Big difference. It rejected almost all of the multipath interference.

[ame]http://www.youtube.com/watch?v=0vlWgz2st78[/ame]

Navigator53 · 03-18-2012, 11:04 AM

Good stuff Windbreaker

I have IBCrazy's Cloverleaf & Helical antenna's

I think I'll try pointing the tx antenna down like you did and see what happens on the Quad

Mel

Tennessee-drifter Heli · 03-23-2012, 10:30 PM

Great results. I really need to try these Antennas.

Tennessee-drifter Heli · 04-04-2012, 09:29 PM

I got a set of IBCrazy Bluebeam Circularly Polarized Antennas today and tried them out. I flew until my failsafe kicked in on my FY31-AP at my best distance of 1 1/8 mile with my Easystar Plane and stock Hitec Aurora. Video was still great. The only video drops I have had with one-day experience have been when the plane was directly overhead of the video receiver. This was however very brief. I am very pleased.

03-17-2012, 08:44 PM	#1 (permalink)
Windbreaker Registered Users My HF Map location Join Date: Sep 2007	Antennas: Inverted Vee & Skew Planar I was having all kinds of multipath interference problems where I fly. There's a large baseball backstop made of chain link fence, plus a dugout with a metal roof behind me. Even at close range (less than 100 feet) I got tons of dropouts and static using various dipoles including the Inverted Vee. This was at 900 MHz and 1.3 GHz. I also tried an Eagle Tree diversity receiver without much luck. It just switched from a bad signal to the other signal that wasn't quite as bad. I switched over to a Bluebeam skew planar (another IBCrazy design) using the 1.3 GHz transmitter. Same receiver. Big difference. It rejected almost all of the multipath interference. [ame]http://www.youtube.com/watch?v=0vlWgz2st78[/ame] Attached Thumbnails __________________ Custom quad copter, Cobra C-3525/18 motors and ESCs; APC 15x4 thin electric props. OpenPilot ControlCopter board. Futaba 8FG Super 2.4 gHz FAAST system.

03-18-2012, 11:04 AM	#2 (permalink)
Navigator53 Registered Users My HF Map location Join Date: Mar 2008	Good stuff Windbreaker I have IBCrazy's Cloverleaf & Helical antenna's I think I'll try pointing the tx antenna down like you did and see what happens on the Quad Mel __________________ When the people find that they can vote themselves money, that will herald the end of the republic. ~Benjamin Franklin ~

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03-23-2012, 10:30 PM	#3 (permalink)
Tennessee-drifter Heli Registered Users Join Date: Apr 2008	Great results. I really need to try these Antennas.

04-04-2012, 09:29 PM	#4 (permalink)
Tennessee-drifter Heli Registered Users Join Date: Apr 2008	I got a set of IBCrazy Bluebeam Circularly Polarized Antennas today and tried them out. I flew until my failsafe kicked in on my FY31-AP at my best distance of 1 1/8 mile with my Easystar Plane and stock Hitec Aurora. Video was still great. The only video drops I have had with one-day experience have been when the plane was directly overhead of the video receiver. This was however very brief. I am very pleased.

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