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elossam

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Everything posted by elossam

  1. Will see how close the altimeter could be from the camera lenses to be focused while focusing the rest of the image. Have also in mind the use of an antenna tracker but I wonder if there is any other simplest device that I´m not considering. I remember years ago a device called tinnytrack that was used to send telemetry through the audio line. Will search a little more. Thanks mate.
  2. Looking for Ideas. I need to record video images while fliying and store them into the video camera with the barometric altitude they were taken at. The only way I can imagine to add datas to the images so they are perfectly synchronized with the images are though the MIC imput of the camera recording them as audio (the camera doesnt accept any metadata imput in other way). I saw some barometric OSDs but that needs to record the images once transmited and I need to record full HD images, record the altitude datas at the same time and play them later together. So the way should be something like a device to convert the barometric sensor signal to something recordable by the audio channel, and a device to read from the audio channel when playing the images in the PC/TV and show the altitude on the screen or on a external screen separately. Any idea about where to start?
  3. Thanks will test that first.
  4. I need to power two radios from a common power source but the common ground makes them work strange while working with their own bats gives no problem.
  5. Thanks. So what I need to find are isolated dc-dc units? I think Recom and Tracoshould work as I need 7.2 V and 300 mah only and the devices will be flying onboard so reduced weigh is a must. A couple of isolated dc-dc (one for each device) is all what I need?
  6. Hi friends. need to run two electronic devices that required to be powered by the same battery source but cant share the same negative pole. Any idea about how to isolate the negative pole from each other? or it is impossible and have no option other than using two different batteries?
  7. It could be the monitor. fpv glasses or different brand monitor works fine but have no other monitor equal that the ones that fails for tesring. As obe of the rx works nice Im using this one and as soon as I can put my hands on a scope will have a look on it.
  8. Thanks will try to put my hands on a scope a see what shows. Keep in touch. Regards
  9. Should be something so. Tested today with a second pasport RX without problens and with a inmersion RX (compatible with the iftron TX) and it failed the same way as the first passport RX. At least that left adide a possible power trouble or a fail in the emited signal. Do you know if the levels yor pointed me to check are commonly adjustable in RX systems through a pot or defined by some fixed value resistors? Thanks for your time mate.
  10. I use a Mondo Stinger TX. Have no access to a scope right now. What to look on it if I can get access to one?
  11. Hi guys. Im using a pasport 5.8 diversity Rx. Using it with Fpv gogles gives nice and clean image but with a fpv monitor it shows the image switching between image and no image every second or so. The monitor shows a label indicating PAL sometimes and SECAM the next flick and so on. Have tried seoarate batteries, increase distance between rx and monitor, remove one antena rx to force no diversity action ...nothing helps. Direct video in from the camera shows perfect image. A cheap chinese 1.2 rx shows perfectly stable image. Any idea about what should I look at?
  12. Thanks guys. I' m waiting my units to start playing with them. Will see
  13. Thanks, will have that in mind and pass the info to a friend and see if there is something to do with it.
  14. The radar cone is not flat so take of with it enabled must be virtualy imposible. Mixing the signal with the elevator channel using a minimix or similar is what I`m thinking to do and a knob from the tx to reduce the gain or the mixing ammount. The goal is to have a virtual spring between the ufo and what it has infront so and obstacle can be close up to a certain distance but no more. Have a Hoverfly Sport board and it` s possible to directly fit this sensor to use it for altitude control. Must check if it works outdoors so I`ll start ordering one but could be fine if someone finds a way to get a rc signal converted from what the sonar can provide but whithout using a full PC to procces it.
  15. At first a single unit pointed forwards to fly close to a building but safe enough not to crash with it. As soon as the building comes into the radar range the elevator channel must push the unit back until the building is out of range again.
  16. Hi kilrah. One of the forms it shows the distance is a PW output according whith the datasheet in the same web. I'm far away of a technic man to understand it but if it is a PWM and it gives different values on it a converter can give me a variable rc signal to be mixed with the main channel. ¿no? I dont need to know hiw far or close an obstacle is but a signal increase when it's aproaching and a signal reduction when opposite that goes down to zero when nothing is detected in the range of the sensor.
  17. Hi again folks. Want to start playing with a ultrasonic radar to add an anticolision system for my quad. Have found this and several similar others http://www.maxbotix.com/products/MB1000.htm but seems to me it is not directly rc compatible like i.e. a gyroscope working inline with the servo. Does anyone know if there are already done adapter boards. Maybe a pwm to ppm adaptar like the ones used time ago on the first quads should be right?
  18. Hi friends, I need to know the voltage value a brushless engine I own is working at when the stick is at 1% (or the one that starts the engine in the lower part), 50%stick and 100% stick. To do it I need to get some answers if anyone of you know them. When a brushless engine manufacturer sets a certain rpm/v value for an engine, does he use the voltage value from the battery to the ESC or the voltage that arrives from the ESC to the engine? Could be wrong but the ESC converts DC into AC and have no idea if the same voltage value is present before and after de ESC suposing the Thr stick is set at 100% (may be there is a voltage loss in the conversion). The second cuestion is: At 50% stick the engine is working at 50% of the max voltage value? or the rpm are dependable of a matter of switching frequency of the coils while the voltage value keeps constant? Thanks guys
  19. I suspect he referes to a channels correlation. If your tx uses in different channels you will not be able to get the same range results. About the max range with a 10 mw tx, he doesn´t explain if it was a flight test or a static test when he talks about 1.5 km range. According to the results of a range calculator at such distance the remaining gain will be close to 3dbm, too low IMO for a safety flight. Setting half this distance as range target will result in 9 dbm margin which sounds more consistent for a flight. In any way note there are lot of thinks that can affect the range and it´s quite difficult to get an accuracy meassure of all those variables. That´s the reason of keeping some db margin instead of relying in the max theoretical range.
  20. Hi Sebastian Thanks for the link. I see you have also the first unit I posted here (the one from Intelligentflight http://www.globe-flight.com/24-GHz-4-channel-A-V-receiver ) and it´s rated in your web at -85db while in the first link it shows a channel vs sensibility from -91 to -95 dbm (see http://www.nghobbies.com/cart/index.php?main_page=product_info&cPath=94&products_id=348) I wonder why there are such differences and where did they get such detailed info. In your case and being more according to what is in the market, the -85 dbm is something you have meassured? About the unit you linked, the range test could be a way for testing but again, where does this specs come from? the manufacturer or your self meassuring? It could we worth to test one unit, must check my current TX channels first but along the last years I´ve collected to many "miracle" stuffs and I don´t want to increase the "maybe-in-the-future-could-be-usefull" box. Let me know and meanwhile I will check the channels we are using. Another think if you don´t mind, does this Rx have a RSSI output (operative or at least accesible in the inside board)?
  21. If I could only get real -90dbm ..... what a dream, those -6dbm difference implies a lot of weigh and system simplification in the RX station and/or lot of weigh and energy consumption onboard. Will keep my eyes and ears open as allways to see if anything new arrives to the market in that direction.
  22. Thanks mate, I understand what you say. Initially I though the common level was arround -83dbm due to the nature of the tunners (based on sat TV) where thanks to the type of antennas used and the fixed Rx position doesn´t require higher values. This i.e. the origin of COMTECH tunners and may be other ones. Is there is a physical law that makes impossible to get better gains without falling into a noise factor beyond acceptable or is a matter of money?
  23. Most of the video receivers I know has a sensibility between -82dbm and -85dbm but there are at least three that claims for values over -90 dbm http://www.allthings.com.au/Wireless/video%20receiver%20mini.htm (-92dbm) http://www.nghobbies.com/cart/index.php?main_page=product_info&cPath=94&products_id=348 (-91/-95dbm) The 3th one is from airwave model AWM650G-RX (-90dbm)but it´s not updated on AW´s web and AW support doen´t answer my info request. I´m skeptical about those specs because if they are true, the differences are big enough to make them look like little jewels in the RC/FPV community but I never saw any feedback about them. Has anyone experience on any of those models (or anyother over -85dbm not listed above)?
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