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RC-Cam'er (2/4)



  1. Ah well, thanks for the replys, I am looking at replacing it with this: http://www.fpvhobby.com/transmitter/12-2-55-volt-500mw-24ghz-video-transmitter.html Which seems to have the same frequency set as my older BW diversity rx, or possibly this : http://www.fpvhobby.com/30-4ghz-500mw-transmitter.html Which seems to be the same unit, but with a mic and power board built in, but would only work on ch 3. I find it odd that the same unit would be sold with 2 different frequency sets, but I supose since there are no crystals, it's all up to the programing. Anyone have a difinitive answer as to in audio will work with these?? they seem to have audio carriers at 6 and 6.5hz for stereo, but I can't find a spec on the lawmate RX, I am mostly looking at these units because of this artical: http://forum.tsebi.com/viewtopic.php?f=4&t=100 Which states that the output dosn't sag with heat unlike the lawmate, and they are capable of 1w (30 db) which would be nice.
  2. maybe it overheated, I had it sitting on for a while with no airflow, do these need lots of external cooling?
  3. Trying to figure out why I'm not getting any range on a small BW 500mw 2.4ghz lawmate 5v TX. I tried to guage current draw, and it's almost nill, around 100ma or less. Only run on 5v, Still getting a clear signal when very close, but 20 ft is about the limit. I can't figure out what I did to it, but it also dosn't seem to get warm like it used to. Is it posible to blow the amp end of these without blowing it up all the way?? I asume it's a brick at this point, I know BW dosn't sell these amy more, anyone with a hot tip as to who has the best price?? Thanks Ken
  4. given the cost of a replacement, and the value of the complete plane, I wouldn't trust it in the air. I supose strictly for recording, but given the damage to the board it's a big risk for FPV. Esp given how hot these run, the expansion and contraction could easily break a fix over time.
  5. haven't been keeping up with this thread, but yes use that address, I got the BB back fine a while back. Not really inderstanding the chip you are using, this might not work, but could you have the oracle take a sample of the current video quality, and then do a switch baised on a decrease from that level? The user could select from a set of allowable decreases in quality. This problem with the BB video out levels might also explain why the mobicom 900mhz video tx I had been playing with didn't work if the video went through the BB first.
  6. ah, I never actually flew it, just tested it in the yard and such. I didn't look at it closely enough to see the color/cantrast change. Did you notice that the switching seemed to start off fairly normal, then increase untill it's almost constant? Thanks for taking a look. Ken
  7. my black box is off to you. I agree that it's sort of a dead product, but was hoping to use it untill I made the jump into another OSD. $$$. I figure that it might be usefull to know what is wrong with it, so that the problem dosn't reapear later in a new osd design. It's esp odd, since the video looks fine on the screen. Ken
  8. I supose I could send the Black box to you, I'm not going to use it any time soon. Would like it back at some point of course. Ken
  9. An oracle update: I have been building a twinstar seaplane FPV. I was hoping to use a new mobicom900mhz 1.2watt tx, but it has been shelved due to rf interferance and servo jitters. I have aready reported on another thread that my black box osd did not work with th mobicom tx, even though it seemed to work fine with the airwave modules. I proceded with airwave and the black box, but now I have found that the black box has a problem with the oracle. On first power up, everything works fine, but after 30sec or so, the oracle starts switching, this increases ultill the switching is almost constant. I have tried powering the tx/camera on separate lines, and even separate power from the OSD, thinking maybe it was heat buildup, no luck. I have tried adding extra caps on the video lines, still no help. The odd part, is that I can not see any problems in the recieved image, the data and picture are sharp and clean. rapid switching occours even in the lowest sensitivity setting Any ideas? I can't fault the oracle, as it works fine as soon as the black box is removed. Ken
  10. I wasn't expecting so much noise from this tx. I may just bail and step over to a 500mw 900mhz tx, or look into the future hobbies 700mw one. Using a std shielded video and power line dons't help much, as the ground seems to broadcast noise too. I tried various caps from ground to power, and small filter caps across the servos, without much imporvement. I have had some sucess moving the tx to the rear and running a three conductor (video, power, ground) with a shield not attached to anything. I wrapped the camera in foil, but did not connect the foil to ground or the shield. I don't like this location much though, as the heat sink, tx and battery make a pretty big package with lots of drag. I am running a pan tilt head with 180 deg servos, which seem really sensitive to whatever the 900mhz tx is putting out. I am using a pcm futaba. still getting about 60-70% range.
  11. Is your 900mhz tx by any chance a ebay purchased mobicom tx? I am currently chasing interferance from one using a std pcm radio. I have moved the tx and it's battery back to the tail, thinking it would be cleaner there, the camera is in the nose, with a video only feed traveling through the center of the plane. I am still getting jitter, and only about 60% of normal rc range.
  12. I am trying to tame some interferance I am getting from my mobicom 900mhz tx. I am moving the tx towards the tail, but want to add some ferite rings too. There will be a sielded video/power line back to the tx, camera and battery in the front. I have braided the servo lines, and have some ferite rings, but am a little uncertian where to put them. Servos, close to the rx or the servo? Power cables? Video/power cable? Which end, tx or camera and battery? I was getting some jittering when the 900mhz tx was near the servo lines. When I connect the tx directly to the motor battery, everything jitters and the rx (pcm) drops out. I think I will just use a separate battery. Thanks! Ken
  13. the specs I have seen claim that the loss at 2.4ghz is greater for the connector than for a lot of cables, esp for a couple of feet of resonable cable. Unless you are going to solder a sma plug directly to the back of the antenna, I would think the risk of messing up the cable, would be greater than the gain, esp if the insulation isn't teflon. It can melt and change the spacing. YMMV Ken
  14. it's pretty odd, I broke the video out line, so I could touch inputs for the camcorder or the 900mhz tx in real time, it's there for the camcorder even when the tx is still powered up, so I don't think it's swamping anything with RF. Now I realise that I should have hooked up both the camcorder and tx to the signal at the same time, to see if the picture drops out on the camcorder because of some drain the tx is placing on it, or if the tx is just more sensitive to having a nice video signal, and something about the osd combining the orig video with it's overlay is messing things up. Something to waste more time with tomorrow...... Ken
  15. by terminate, I asume you mean to put a 330ohm resistor from the video in signal (from the camera) to ground. This didn't seem to have any effect. I did discover that if I turn the video to disable, the data screen goes through the 900mhx tx just fine. I know that in normal operation, camera and Black box connected directly to a camcorder, video enabled, if then the camera is unplugged, the whole display dies. So for some reason, the adition of hte 900mhz tx is making the Black box think that the camera isn't plugged in. No real Idea on where to go from here, pretty strange. Ken
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