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Corey

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About Corey

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  1. Regarding what a diversity receiver does... You need to have at least TWO receivers and two antennas if you use diversity, but you use just one tx on the aircraft. The diversity unit takes the two input signals, decides which one is best, and then outputs only the strongest signal to whatever you are using to view or record the video. I think it does it something like 500 times a second so it's visually seamless. I've read that it can make a real difference in the clarity of the reception, even if the two antennas are less than a foot apart, and in MY EXPERIENCE it does improve things sign
  2. Hi Matt - Enjoyed the video! There's a lot of experts in here who can give you far more detailed advice than I can, but for what it's worth I'll give you my feedback after having spent some significant "trial and error" dollars over the past year on FPV flying and equipment. The 5.8ghz stuff is newer and more expensive, which made me think it must be better. I currently have two Yellowjacket Pro diversity receivers that cost close to $600 each, plus three of the matching Stinger transmitters at around $250 each. After playing with them for several months I've gone back to 900mhz equipmen
  3. Thanks for the information guys! My bad Kilrah, turns out the receivers are actually each running on their own single-cell li-ion battery. I'm going to replace them with receivers that don't have a battery and require a 12V input. I'm now thinking maybe an 8000mah 3-cell lipo with 7 separate connectors going out to the various devices might be good. Regarding how the set-up is working with 3 Oracles, this video I posted on YouTube was done with the same set-up, except on this one I was using two Yagi antennas and two Patch antennas with the 3 Oracles. Corey
  4. I'm currently using four 900mhz video receivers and four patch antennas on one of my FPV set-ups. The receivers are connected to two Oracle diversity receivers and each Oracle receiver sends its output to a third Oracle receiver. That's seven separate power requirements. The four receivers each have their own small 2 cell lipo battery and I have been using a 3 cell 2200mah lipo with a single home-made connector that feeds all three diversity receivers with power. It seems to work pretty well but I've been thinking I'd rather use a single 12 power supply off a generator or something so I do
  5. This is just sort of a curiosity question that came to mind today... I was wondering if you could use two cameras spaced apart (like your eyes) on your aircraft and then feed the signals separately to the left and right screens of your video goggles. Assuming that it could be wired up if you knew what you were doing, would give more of a 3D view of the flight or would it just be a mess?
  6. I had the same problem with the Blackstork GPS when I first installed it on an Easystar a couple months ago. The manual said something about this happening and suggested playing with the wiring to correct the problem. After randomly re-routing all my wiring and double-checking all the connections it worked. Not sure what the specific problem was but at least I was able to get it working. For what it's worth I have the GPS wire lead as isolated as possible from all my other wiring. I'm really new at this so keep in mind that my comments and advice might not be worth all that much!
  7. Thanks for the info. Regarding the patch antenna orientation and to make sure I understand correctly, if I overlap the beam coverage it should reduce mutlipath interference but reduce the overall coverage area? Also, would it be worth trying to significantly separate the patch antennas from each other or is that not an issue? I was thinking about putting one of the Yellowjacket receivers with its two patch antennas a couple hundred feet or more away from the base set-up and then bringing the output signal back to the base station Oracle receiver via a separate Tx and Rx on a different fre
  8. I've got some new equipment to try out this weekend and was hoping to get some info to make sure that I'm at least thinking in the the right direction as far as set up is concerned. The equipment is on the 5.8 frequency. I have two Yellowjacket pro diversity receivers feeding into one Oracle diversity receiver. My Trex 500 heli has a 250mw Stinger Tx with the stock whip antenna pointing straight down, several inches away from the radio Rx and the speed controller near where the tail servo is. Then I've got four 8dBi patch antennas for the Yellowjacket receivers with specs of 75 degree hor
  9. Aha! Buffer / Amplifier... Where can I read about and find one of those?
  10. In my continuing hobby-level experiments I tried something today with crummy results that seemed kind of odd and I can't figure out what was going on. I used both a 500mw 900Ghz TX and a 250mw 5.8Ghz TX on the same heli, mounted about 4" apart, both with the stock whip antennas facing straight down to the ground. My thinking was that if one frequency was not getting decent reception for whatever reason the other frequency might work fine. The wiring from the camera up front was spliced to feed both TX units and I ran all three devices from one 3 cell lipo, separate from the lipo for the h
  11. Sorry, me again... This is what happens when you get good information, more questions! Can I use an RF signal amplifier on the receiver side rather than aircraft side? I was looking at a 5.8 signal amplifier that boosts the signal to 1W but it's a pretty hefty unit and wouldn't work on the aircraft. I thought I'd read some info about this but can't seem to find it. Can I put it between the ground antenna and the receiver?
  12. Man, you guys are smart! I've learned more on here in 24 hours than I did in 6 months of Google searches and shelling out cash to try what I mistakenly thought was going to fix the problem. I should split the $7K between you guys! I had no idea about the problems with the omni antenna but it certainly makes sense now that it's properly explained. Terry, that video of yours is great! How do you set up 4 of the patch antennas to work like that? Are you using multiple diversity receivers in a sort of chain? Also what is the physical configuration of the antennas, and do you have them on
  13. This video is typical of what I've experienced with most of my wireless exploits... This one uses a 500mw 900mhz tx with the stock whip antenna on the tx facing straight up from the EasyStar canopy. On the ground I am using an 8dBi HG908U-PRO Hyperlink fiberglass pole omni-directional antenna attached to a tripod stand that puts it about 12 feet off the ground. I don't think the aircraft is ever more than about 2000 feet from me in this video but it still has a lot of static and drop outs. Maybe I'm just expecting too much? http://www.youtube.com/watch?v=Nv7jHHB7kxY
  14. After disappointing results using wireless equipment from several of the RC wireless websites I've been looking at getting some "higher end" equipment that is claimed to be of the quality required for military and law enforcement use. What I'm wondering is if anyone has gone this route and found that the relatively expensive equipment is really worth the money. Several of the companies I sent inquiries to have told me they have what I want and that those other companies I've bought from are using cheap Asian import stuff that isn't really what it's claimed to be, but I'm skeptical and somewh
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