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Old Nov 15, 2010, 10:13 AM
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Awesome stuff...

Was just about to ask if there is a video of this baby in action?
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Old Nov 15, 2010, 10:20 AM
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Just thought about something else. How precise do the 2 side antennas need to be? I am just trying to think about how identical I can make 2 biquads. I am guessing it won't be too much of an issue, but what if they end up being slightly "off" as far as gain etc?
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Old Nov 15, 2010, 11:14 AM
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So does the elevation of the plane matter with this tracker, since it only rotates?
My guess is that with an omni directional for close proximity flying along with a diversity switcher, it wouldn't matter much (assuming that for distance flying the altitude of the plane lessens the need for drastic angle changes in elevation?
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Old Nov 15, 2010, 11:25 AM
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Quote:
Originally Posted by techspy View Post
Just thought about something else. How precise do the 2 side antennas need to be? I am just trying to think about how identical I can make 2 biquads. I am guessing it won't be too much of an issue, but what if they end up being slightly "off" as far as gain etc?
They don't need to be perfect. Heck, they don't even need to be that close. That's what the 100K potentiometers are for. When you calibrate this, you aim both of your antennas at the transmitter, then measure the output of you RSSI buffer (I measured the voltage at the 10uF capacitors). Adjust the potentiometers until the volages are equal.

If you are on 2.4GHz or 1.3 GHz, a "cantenna" will be easier to build than the BiQuad. I will wite the tutorial soon.

-Alex
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Old Nov 15, 2010, 11:32 AM
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Quote:
Originally Posted by mike20sm View Post
So does the elevation of the plane matter with this tracker, since it only rotates?
My guess is that with an omni directional for close proximity flying along with a diversity switcher, it wouldn't matter much (assuming that for distance flying the altitude of the plane lessens the need for drastic angle changes in elevation?
I opted to leave out tilt. To me, tilt is just one more thing to have go wrong. When an antenna tilts, it loses polarization. I opted to aim my antenna up at a 20 degree angle. This gives me a 50 degree vertical beam, which is plenty. You could also use a patch antenna for your video feed. The video antenna and the tracking antenna do not need to be the same.

There is no need for a diversity controller with this tracker. Since building this, I have retired both my Oracle and my homebrew diversity controller. This just works so well, that there is no need for the added complexity.

-Alex
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Old Nov 15, 2010, 01:23 PM
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IBCrazy, you are my hero. I just want you to know that
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Old Nov 15, 2010, 01:33 PM
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Do you have a video of it in action?
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Old Nov 15, 2010, 04:32 PM
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Demo video uploading now

It's a quick demo in my driveway. I am uploading raw video since I can't get the sound to work on my video editing software. Notice that the area is a multipath nightmare, yet the tracker still has a lock on my transmitter. I had the delay timer set at 50% duty cycle.

DIY antenna tracker Demo video (1 min 2 sec)
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Old Nov 15, 2010, 04:41 PM
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Cool. Man I haven't thought about making a cantenna. looking forward to the tutorial.
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Old Nov 15, 2010, 07:57 PM
Fly it like you stole it!
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Wow, that thing is awesome!
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Old Nov 15, 2010, 09:34 PM
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Nice job!
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Old Nov 15, 2010, 10:55 PM
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its time to have these mass produced!
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Old Nov 15, 2010, 11:10 PM
Project Tormentor is flying!
United States, WA, White Salmon
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That is so awesome! I love it! I'm going to get my hands on one of these one way or another....Good job!
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Old Nov 16, 2010, 12:00 AM
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USA, OR, Portland
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That thing sounds like ED-209 from Robocop. Heck it sounds like Robocop himself. Great job man.

ED 209 Just Won't Stop ! (2 min 15 sec)


Now we get to see the face behind the DIY postings. Great job man.
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Old Nov 16, 2010, 02:06 PM
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thanks for uploading
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