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Home✈️Aircraft🚁HelicopterAerial Photography and Video › Ready to go: BW downlink + Nikon D70 + Mark IV
07-18-2006 05:41 PM  14 years ago
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Uffe

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Stockholm, Sweden

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Ready to go: BW downlink + Nikon D70 + Mark IV
Nothing new, but after gaining so much knowledge from this place I thought I'd pay back and show you how I succeeded.

BW 200 mW video transmitter and KX-131 cased camera. I started with a 2s Lipo and a National LM2940 voltage reg, but then decided to use the Lipo to suply the RC receiver as well. Therefore I went for the Traco DC/DC converter and a 3s Lipo pack. The cable coming out from the right is power+signal to/from the camera. The (small) one on the left is power for the RC reciever. The fuses are just an extra precaution after blowing the transmitter in my first attempt. Works perfect, no disturbance on the video signal when operating the Mark IV mount.

The camera is slid into a Nikon eyepiece adapter. I had to put a gasket cut out from a rubber carpet in between to make it fit. I bolted a copper plate to the hoop that fits on to the speedlight connector to keep it in place. The picture I get with the KX 131 looking through the viewfinder on my D70 is a bit fuzzy, but I can se the shutter info etc. at the botom of the eyepiece.


A very simple and unfancy reciever tray made out of plywood. The reciever and a 3s 2.5 AH Lipo is attached beneath.

Finaly: My parents dining room while they're away during the summer. This is where I have my workshop.

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07-18-2006 06:01 PM  14 years ago
GMcNair

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Birmingham AL

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Uffe, did you try focusing the lens on the camera? There should be a tiny slotted screw that if you loosen, will allow you to turn the lens in and out to adjust focus.
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07-18-2006 06:08 PM  14 years ago
Uffe

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Stockholm, Sweden

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I did, but just realized I forgot to adjust the slider by the viewfinder on the D70. It has a great influence on the sharpness. I might have to adjust them both tognether. To bad I glued the camera to the eyepiece adapter...
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07-18-2006 06:28 PM  14 years ago
HawkEyeMedia

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Fort Worth, Texas

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I've been researching DC-DC converters because I want to use a 3S or 4S lipo to power my mount.

Did you have any problems with interference in the video transmitter from the Traco converter?

I want to use the lipo to power my Kenyon gyro and the reciever and video transmitter so I need two seperate 5v regulators. The Traco's seem to be the most efficient.
Mark LaBoyteaux
HawkEyeMedia.com
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07-18-2006 07:54 PM  14 years ago
Uffe

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Stockholm, Sweden

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Did you have any problems with interference in the video transmitter from the Traco converter?
So far no interference problems at all. The voltage output itself seems to extremely stable. The switch frequency is 300 kHz and the Traco unit is shielded so there should't be any problems.
I want to use the lipo to power my Kenyon gyro and the reciever and video transmitter so I need two seperate 5v regulators. The Traco's seem to be the most efficient.
I might be missing something here, but why do you want two separate regs? The hotest 5 V Traco delivers up to 8 A. I'd try with one for all your gear, and if the motor in the gyro causes to much ripple you could proceed with a separate one for the Kenyon
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07-18-2006 08:16 PM  14 years ago
HawkEyeMedia

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Fort Worth, Texas

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I've tried to power the video transmitter and the reciever from a single 4 cell Ni-mh. The radio receiver creates interference in the transmitter when they're supplied from a single source. I thought about trying to build a filter, but it was easier to just use 2 seperate battery packs.

Since the new mount I'm designing will be using the Kenyon Gyro and I'm trying to save weight, I want to use a single power source for everything on board. I'm afraid that using one regulator will allow the Futaba receiver to interfere with the video transmitter.
Mark LaBoyteaux
HawkEyeMedia.com
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