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Old Oct 07, 2014, 12:56 PM
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433mhz beacon transmitter Desensitizing 2.4ghz Spektrum DX6i receiver

I made the coolest tiny beacon transmitter for under $1. It has a range of 2 miles to help me find my lost airplane. Unfortunately I can't fly more than 100m away, because the receiver is desensitized. It's only 10mw output. Luckily I noticed this during range testing before I took off. No matter where I place the new transmitter. I can put the antenna right behind the Prop, or back near the rudder, it doesn't matter. Can I use a low/highpass filter? Is there a simple timer that I can use to keep it off for 30 minutes? I don't want to include another Arduino board, since the transmitter is smaller than a dime.

Any suggestions? I so want to use this idea. Help!
Steve
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Old Oct 07, 2014, 01:06 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
24,725 Posts
Have you looked at your output harmonics? How are you powering the beacon?

How are you powering the receiver? What receiver are you using? What modulation mode?

Andy
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Old Oct 07, 2014, 03:59 PM
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I don't have a spectrum analyzer, but 5 or 6 x 433.94 is not 2.4. I was powering it thru the 5v servo plug on the Spektrum receiver. Is that a problem? Should I use a separate battery?

I am using this with DX6i
http://www.amazon.com/Spektrum-DSMX-.../dp/B004M166WE
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Old Oct 07, 2014, 04:08 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
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If your DX6i in DSM2 mode? Do you power up the beacon prior to powering up the transmitter?

Yes, it's a problem to power them from the same battery. A separate battery will help immensely.

Andy
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Old Oct 07, 2014, 04:16 PM
Stuart
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UK, Cardiff
Joined Dec 2008
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Quote:
I made the coolest tiny beacon transmitter for under $1
You made it ?

So how do you know the frequency is 433mhz and the power is 10mW ?

Quote:
It has a range of 2 miles to help me find my lost airplane.
With good line of sight maybe, but very much reduced range for a crashed model on the ground in urban or forest areas, maybe as low as 200M or less.

So if the beacon is working, how exactly do you intend to find the model ?

I do think you are assuming you can make something for $1 and it will turn it into some sort of magic very long range locator for finding lost models, unfortunately its really not so simple.
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Old Oct 07, 2014, 05:31 PM
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Andy you're a Genius! Almost perfect with a small separate battery. I'm using a satellite receiver also. If the Xmitter is near the main receiver, 1 orientation works perfectly, the other about 90% of the distance in Range Check mode. If it's near the satellite, then the opposite is true. Just need a little more distance then I'm golden...
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Old Oct 07, 2014, 05:37 PM
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srnet, I measured the input power with my multimeter. I've already tested it at 2 miles, using my Ham HT. It works even in the deepest PA woods. I simply use my rubber antenna driving or walking until I get full quieting in FM mode. Then I remove the antenna and use my finger, walking until the signal is stronger on my signal strength meter. Then I remove my finger and walk until I'm within 10ft of the model. I have tested all this, it's easy. To make it even easier I can use a directional antenna, but this is not needed. I've been doing Fox Hunting in the Ham Radio community since 1978. If all that fails, at close range, I also have a Loc8tor on all models, and a TK102 on my larger models. There's no way I'm going to lose a model in the woods! It really is that simple.
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Old Oct 07, 2014, 05:40 PM
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Would anyone like one? I can make more!
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