Jump to content


Trusted Member
  • Content Count

  • Joined

  • Last visited

Community Reputation

0 Neutral

About twinturbostang

  • Rank
    RC-Cam Mentor

Contact Methods

  • Website URL
  • ICQ

Profile Information

  • Location
  1. Thanks guys. Good suggestions. I will have to try one of those. I thought I had heard different tones coming from the Oracle though. There's the usual beep when switching receiver inputs. And then it makes a different tone when the low battery warning is hit. Couldn't something like that be implemented?
  2. I've been doing some antenna testing lately and I found that it would be incredibly helpful if the Oracle made a different beep sound each time it switched between receivers. I found myself not knowing which receiver/antenna was currently selected. Each time I wanted to know which was being used, I had to raise my video goggles and look at the Oracle LED indicators. Of course this is not very easy (or such a good idea) while flying an airplane. So my suggestion is to modify the firmware such that the beep sound has a different tone depending on which receiver is being switched to. For example... a "beep" for video 1 and a "boop" for video 2. Seems like a simple, yet effective, solution. Any chance on implementing this? Thanks, Brian
  3. Yes, I'm running your 900 Pro Tx and matching Rx, along with a second Rx purchased from Range Video a couple of years ago. I have already reduced the sensitivity of Oracle to "Low" (if I remember correctly). However, I prefer to have the switching sensitivity set higher so that it switches receivers quicker when encountering normal noise or multipathing. I don't believe DragonOSD has a pixel brightness setting. I've heard Daniel Wee (designer of DragonOSD) talk about adding a resistor across the camera leads or in series with it. And I think it's to help with what you say... to bring the voltage levels down. I could try that and see if it helps. Any thoughts on that?
  4. Update: I flew this morning from my usual field. Video interference was completely gone. So the last flight definitely had some sort of external interference present. Bummer. I was really looking forward to flying to a few locations at that spot. I may have to look into running video on a different frequency band. I have some 2.4GHz gear. But I'm currently using the Futaba FASST RC control system (which operates on 2.4GHz), so that's a no go. At least until my DragonLink UHF system arrives. Also, I have found the source of the problem with my "Morse Code" Oracle. There is an option in DragonOSD to turn off "text borders". With text borders ON, it puts a black border around the text. Makes it a bit easier to read in bright conditions. But with it turned OFF (which is how I had it set for today's flight), Oracle was whisper quiet except for the occasional Rx switch. So, now that I have found the source of the problem, what to do about it? I would still like to have the ability to turn the text borders on in case it makes it easier to view the text. When the sky is overcast (read: all white), I think it's going to be harder to read the text at the top of the screen. Anyway, do you think it's a problem with the OSD output when this feature is enabled? Or is it a problem with the Oracle seeing such a drastic change in the white level so quickly?
  5. Sure would like to have a high quality 900MHz receiver. And I'd be willing to pay more than lowest price for it too!
  6. No update on my Morse code Oracle. But I did fly today from a new location, and believe I have external video interference. What does this look like to you guys? I haven't seen this before on my plane. I removed the switching regulator for a linear one to power my camera. And that was several flight ago. So I don't think it's any kind of onboard interference. Although, who knows. I've got to try and fly from my usual location with the plane in the exact same configuration to be sure. Anyway, the flight today was over a man-made lake. And I think there was a large antenna over near the dam, which was approx. 1/2 mile from launch point. At 300' out (sometimes less than that) I could see strong interference, and it got progressively worse from there. Farthest out I got was only 1/4 mile. I've been out 1.4 miles with my 900MHz gear and great video quality, so I suspect it's external interference, but can't be sure yet. Any ideas?
  7. Thanks for the info. I have an o-scope at work that I might be able to use. However, before I drag my airplane into work (lol) I'll try to do the other suggestions first. Not sure if you meant an old TV or a computer monitor, but I have a very old 19" TV that might work. Although it's so old that I'm not sure if it even has RCA inputs. It might just be a co-ax connection. As for the second set of tests, I may not be able to do those yet. The DragonOSD+ v2 uses a PPM stream input to control the system and output to the control surfaces. However, I don't currently have a Rx that has PPM stream output. So I don't have a way of disabling the overlay features. At least not yet. I have a DragonLink on order (which has PPM out) and hopefully that will arrive soon.
  8. I FINALLY determined the source of my video rolling issue. Weather has been bad lately and I haven't had much free time. But, this morning I finally got to fly and yep, my video glasses were the source. I flew with my new Headplay glasses today and they were great! No video rolling at all. Nice crisp image. I've also switched back to a linear regulator for powering the KX131 camera and there's no video banding either. However, I have another issue now. Well, it's not new, I just haven't addressed it yet. It seems whenever I have my OSD hooked up, the Oracle diversity goes nuts. It constantly switches between inputs so fast, it sounds like it's sending Morse code! lol Any idea why it might be doing this? I have the DragonOSD+ v2. Even when the plane is on the ground just 10 feet away from the Oracle, with perfect video image (at least to my eyes) it still does this. And when in the air, it doesn't matter if it's close range or out far. Still does it. But when I bypass the OSD and just run the video image straight from the camera to the video Tx (DPCAV 900 Pro), it seems fine. Only occasional blips from the Oracle, which is normal. Any help would be appreciated. I need to do some diagnostics and testing on this but I don't know where to start. Thanks, Brian
  9. Ok, I didn't know if that was normal. Or maybe an indication of the electrical noise that's going on.
  10. Yes, that's what I was referring to. I did get a chance to do some quick testing this morning, and I think it is in fact due to the regulator. I powered everything up as usual, and the banding was there. Then I removed the power lead from the video connector on the 900 Pro, so that I could power the camera via a 4 cell nicad pack. Video Tx powered by a 3S lipo, and camera via 4 cell nicad. No external regulators. And no banding was visible at all then. So it looks like I need to try the added filters you suggested, try a different regulator, or go with a 12V camera. Which as it so happens, I have. I've got a KX171 from Intelligent Flight (back when they were still in business). It's a 12V camera, and has higher resolution than the KX131. It doesn't have as good color saturation though. But at least I've got a couple of options of things to try. BTW, in the flight recording, if you turn the volume way up (before the motors are turned on), you can hear a high pitched whine. Could that be the electrical noise from the regulator getting into the microphone? ESC noise? Or is that normal?
  11. Can't say exactly what the range is, but here's a couple of data points for you... I've had my 10C system out to 1.4 miles with perfect control (my "river road" flight here: ). I also recently (this year) went out to a mile range... with the RC Tx antenna pointed straight at the plane!! Now that tells me that there's quite a bit of range left in it, based on the radiation pattern of the dipole antenna. I was just starting to notice some packet loss at a mile range with the dipole pointed at the plane. This was evident by how the camera pan servo was behaving. It wasn't "glitching" like you see in 72MHz systems. Instead the pan motion was not quite as smooth. It started stuttering a little. But as soon as I oriented the antenna properly, I had perfect control again. Anyway, based on this, I'm guessing the range of a stock system is somewhere around 2-3 miles. I'm hoping to test that out soon. Also, if you build the little aluminum reflector that sits behind the antenna (sorry, I forget where the link to it is), that significantly helps. In ground range tests, I was able to get 40% farther with the reflector in place. Brian
  12. I'll check and see if they have anything. Meanwhile, I did a little bit of testing today on the video banding issue, and I'm confused (more than usual). It appeared that I was getting the banding when powered from the switch regulator.. but only when it was transmitting the video signal via the 900MHz Tx/Rx. If I bypassed the video Tx and plugged the camera output directly into my goggles, I didn't see any banding. That was odd, as I did not expect it to be better. If the switching regulator is causing ripple on the power line, could that be affecting the video Tx?? That's the only thing I can think of. Microphone was disconnected. I also disconnected the Oracle and ran directly from one Rx just to eliminate that as a possibility. Same result. I need to do some more testing to verify this. I also want to run 5V power to the camera from a 4 cell pack (so no regulator), and then feed the video signal to the Tx. That requires modifying my camera harness though as I need to remove the V+ pass through of the 900Pro and instead splice in an external 5V source. I may or may not have time to do that in the next couple of days. BTW, I've had this banding issue since before I started using the 900Pro. It was there with my Range Video 900 Tx also. So I don't believe it's anything specific to the 900Pro Tx.
  13. Can you get those from the local RatShack? And do they go across the + and - leads? If I can improve the regulator, that would be great. It's a nice and compact design and doesn't weigh much.
  14. Terry: "yesterday" was like 2 1/2 years ago! lol I actually have a set of goggles on the way to me. Couldn't pass up the Headplay $100 deal from Dell. Hopefully that will resolve the issue. The glasses I'm using are the very old original I-Glasses. They have (at most) 320 x 200 resolution. So I'm really looking forward to better quality images. It's tough to see small objects on the ground with them. I think they were built back in the late 90's, so they are old and have no way of updating the firmware. The video lines have been there before I installed the microphone, so it shouldn't have anything to do with that. I'm guessing it's due to the stock KX131 regulator, but I'll do some testing using a regular 4 cell nicad to make sure. I'm also using the Oracle diversity which has two buffered video outputs. So there shouldn't be anything funny going on there. Brian
  • Create New...