Jump to content


  • Content Count

  • Joined

  • Last visited

Community Reputation

0 Neutral

About Airbender

  • Rank
    RC-Cam Visitor
  1. Friends, Check out this link for 900 Mhz antenna "Sweeps". http://www.rcgroups.com/forums/showthread.php?t=1340355
  2. Friends, I recently stumbled upon this vendor under the "vendor links" section: http://www.securitycamera2000.com I am very interested in this product: http://www.securitycamera2000.com/products/0.9G-1.5W-4CH-Wireless-Video%7B47%7DAudio-Transmitter%7B47%7DReceiver-Kit.html has anybody tried one of these? Do they work as advertised? TIA for you input.
  3. Friends, I need some help fine tuning my 900 MHZ FPV system. I purchased a 900 MHZ 500 Mw system from Range video about 1.5 years ago. I have used it infrequently primarily because I get such lousy performance from it. I have some experience in RF so I know a few of the basics. Problem: Whenever the TX exceeds ~75' from the RX, the signal quality drops dramatically. I see the "noise" lines across the screen, or the video picture drops completely. I have experimented with the following possible solutions: 1) I initially had the TX+cam mounted on a Trex 600. The camera itself was mounted underneath on a separate camera frame and the TX was near the rear the the helicopter. I was careful to route all of the video lines away from other power or RFI/EMI power sources. The Tx uses its own separate power source. The cable from the camera to the TX goes thru a toroid ring (10 wraps) and is close to the TX. Result = Still having signal drop issues. 2) As you can see from the photos, I have utilized four different omni style antennas on the TX. Each style TX was used at both vertical and horizontal orientation. The largest omni is a 5 dbi I purchased from L-Com. I used the second large omni on the RX, also in different orientations. I have even tried different combination's of both large and small omni's pictured on the TX and RX. Still having signal drop issues. 3) I then purchased a large panel/patch antenna rated at 12 dbi to be used on the RX. Again using different omni antennas at different orientations on the TX, I was getting only marginally better signal quality, but still having poor performance overall. 4) I then repeated the above listed trials using a large foamy airplane (Multiplex Mentor). I mounted the camera, battery, TX & omni under the tail, on a flat aluminum plate (see photo)far back away from the nose containing the electronics. Still having performance issues. I do not have a recorded video....yet. So, here's my theories: 1) Range video product is junk, or I got a dud, or both. 2) I need a more powerful tx, like this model: http://www.nghobbies...products_id=292 3) I need a different model TX, like this model: http://hobbywireless...&products_id=71 or this one: http://www.dpcav.com...page=1&featured Any and all suggestions are welcomed TIA to all in advance Any suggestions would be helpful.
  4. Friends, I am currently using a 1 watt 900 MHz range video system. The Tx has a 5 dB Omni and the RX is using either a 5 db omni or a 12 db panel. I am still getting some spotty reception and will probably go to a diplexed/duplexed rx system soon. Question: I have a request to broadcast a live video feed from the helicopter while hovering stationary outside, to the inside of a convention hall for a demonstration. No idea of the materials used to in the structure of the building, but it would be a safe guess that brick, concrete, wood, metal and glass are all utilized. I am aware that the current offerings on the market are basically line-of-sight and that we are limited in both power and frequency selection here in the USA by the almighty FCC. I am familiar with 2.4 (out of the question - my heli's tx/rx is 2.4), and the 5.8 Yellow Jacket offerings. Can anybody provide a solution? Yagi's maybe? TIA to all
  5. Friends, I am using a range-video 900 mhz rx for my video downlink. My TX is a 500mw using a 5 db omni oriented horizontally. Currently, I have a 12 db panel antenna on the rx, but due to the inherent nature of the panel this limits me to a specific direction on the field I fly. So, what if I could combine another omni with the panel antenna using a splitter? Therefore I could have the best of both worlds, right? or would this insert too much loss? Or, I could have two omni's on my rx, one vertical and the other horizontal. I have attached the type of splitter I would like to use. Please reply with your comments. TIA to all in advance.
  6. Friends, I am still in the process of obtaining the necessary video equipment for my AP set-up. Looking to get a good quality, but not too $$$ portable DVR (digital video recorder). The closest unit I have found is this: http://www.pigear.com/store/PV500-Pocket-DVR-p321.html My intentions are to record video transmitted from the wireless downlink from the helicopter. I will be using an Eagle tree or other OSD system to overlay informational graphics that I will be selling as part of my business model. The portable DVR itself will be on the ground as a part of the "downlink" station. In short, I will have the panel antenna connected to the rx, and the video output of the rx will be split in two: one output going to the FPV video goggles and the other going to the DVR. Another scenario is to place the DVR on the helicopter itself and split the video output from the OSD: one will go to the downlink tx and the other to the DVR. The prime reason for my interest in a DVR is that I have been unable to find a camcorder that will accept a video input for recording. Can anybody recommend an alternative DVR aside from the unit listed above or a camcorder that does accept video input for recording? Please share your thoughts. TIA to all
  7. Friends, I need some advice regarding the altimeter and OSD combinations Recently completed building my "cameraship" - Trex 600 with and Askman .50 APLG mount. I will be getting a wireless camera downlink equipment soon....now I am focusing on the OSD equipment. More specifically, I want to be able to very accurately record my height above the ground while having the camera looking out at a straight and level view from the bottom of the helicopter. In short, I am going to record "balcony" shots and I need to be able to accurately measure the height of the subject(s) I am viewing. I have seen several OSD systems on the market. Most use a GPS antenna to record the height...but just how accurate are they? There is another called the VIZION and t uses a VLOG MOD3 altimeter which claims to have a resolution of +/- 1 foot. Again, are these really that accurate? It is imperative that I have the most accurate altimeter reading possible and be able to overlay the readings on the video thru an OSD system. Any suggestions from the experts? TIA to all..
  8. Friends, I have completed building my camera ship and I am now faced with the dilemma of choosing the frequency for my downlink video. I have a 600 ESP and I am waiting on the Askman AP mount to arrive. All of the downlink gear will be mounted as far away as possible from EMI & RFI sources. My current TX & RX is JR & Spektrum, so 2.4G for downlink is out of the question. The downlink will be used for both FPV and/or recording directly to a DVR that I will have on the ground connected to the video receiver. The advantage is that it will allow me to use OSD devices mounted on the heli for graphics overlay. Therefore, I need a downlink system with good quality video because I will be selling the video+graphics information as part of my business model. I realize there are limitations to all currently available downlink frequencies in the USA, i.e. motor noise, outside interference and line-of-sight, etc issues which would cause poor quality video. From the hours, days & weeks of research I have done, it seems that (aside from 2.4 Ghz), 900 MHZ and 5.8 GHZ are the most likely candidates (here in the USA). Each has it's pros and cons: 900 MHZ: PRO - cheaper equipment, more powerful TX's available, quality of video is acceptable (from the videos I have seen on the 'net), does not require much battery amperage to power the TX CON - line-of-sight & range limited, more susceptible to outside interference 5.8 GHZ: PRO - much better quality video, less susceptible to outside interference, further range with less issues regarding line-of-sight CON-requires more battery amperage to power the TX's and the equipment is more expensive and there are fewer manufacturers=less competition amongst the manufacturers=prices are still high for the consumer I'll be the first to admit that I may be wrong in my judgment and comparisons, but I am just looking for some sage advice from the experts on these forums. Please let me know which direction to go here. Thanks to all in advance
  • Create New...