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Everything posted by Hartwig

  1. -AT-Terry: I didn't modify anything on the modules snce I don't know what exactly is adjusted by these pots. Could you send me a small screenshot to see where exactly this video adjustment pot is located? And what exactly does it adjust? -AT-anthonyrc: Hi Anthony, great to hear from you :-) It's good news that you have such results an I'm very interested to find out how to get my gear working in the same way. Can you give me more details on how you did it? If you want you can also PM me about schematics or whatever. Did you apply certain filtering? Do you use an OSD on the TX side, or just
  2. -AT-qnzkrew: I recommend "TrackOn" from www.hinztec.de as a software for your laptop. It enables you to do realtime tracking with the APRS data sent by TinyTrak. Works perfectly well. You also need a decoder on the receiver side to convert the FSK signal coming from the audio output of the video receiver into RS232 serial data. A good self-assembly kit is the "AS232" from AATIS. It's on a german site. But other TNCs also work. You can feed any Graphic into TrackOn to be used as a map. Just take a screen shot from GoogleEarth and load into your TrackOn maps directory, initialize the coordin
  3. These days I tested DZL's Modem on different TX/RX setups. I think it's quite interesting what I found: TX: Airwave 612 RX1: Airwave 623 RX2: Comtech FM2400RTIM8B VideoSource: KX131PALCASED AltiOSD AudioSource1: EM-411 GPS with DZL Modem (Modulation: BPSK) AudioSource2: EM-411 GPS with TinyTrakSMT (Modulation: FSK) In all setups every way of Audioen-/decoding works fine as long as there no video fed into the TX. As soon as I activate the AltiOSD, or even just the Camera (with one or more bright objects in the picture) the audio signal on the receive
  4. -AT-Temporary Insanity: How do you transfer the 2 signals seperately? Did you use 2 seperate transmitters, or a field sequential encoder?
  5. -AT-Terry: I recommend a LM2940-5.0 or LM4940v5. Even an ordinary 7805 will do. The only thing you MUST ensure that the input voltage for the regulator stays above the regulators minimum input value, lets say 6.0V for the low-drop will work for sure. They tend to get hot, so you might consider a switching regulator in series to provide the required 6Volts to keep it just warm. Have a look at www.dimensionengineering.com. I'm using the "AnyVoltMini" in series with a LM4940v5. Works perfect in all situations with all kinds of batteries and voltages. Cheers, Hartwig
  6. Just a question, please forgive me if it's too stupid, though I know it's complicated, and maybe not too realistic, but I'd just like to ask: Does somebody have already tried transferring data within the vertical blanking interval of the video signal? Just like videotext / teletext / intercast? What do you think of this idea? I don't have the programming skills for this (yet), but I would just like to to hear your opinions on this idea, since the video signal seems to be much more reliable and more immune to noise than the audio channel, at least on the airwave modules and comtech. Ch
  7. Hi Mark, that's great! Please count me in for - AWM635RX US$ 17 (diversity rx) - AWM633TX US$ 15 (500mw) When should I transfer the money? Right now, or later? Cheers, Hartwig
  8. Yo can find datasheets and desc. of the Airwave TXs and RXs also on http://www.active-robots.com/products/radi...v-modules.shtml cheers, Hartwig
  9. I heard that the RF carrier's level of the audio is (in most extreme cases) about 30dB lower on comtech transmitters to reduce harmonics in the RF spectrum. With the Airwave modules it should be about 20dB difference between video and audio carrier level. I heard the optimum must be around 17-18dB to achieve about the same range in distance of video and audio. From previous tests I had audio dropout much earlier than video. But I still didn't have a chance to test Thomas' modem. I will do it on the field this weekend. BTW, -AT-Thomas: Inthe schematic diagram of the modem the resistor
  10. -AT-Mr.RC-Cam: Do you still have the EM411's on stock, or are they sold out? I would be very interestd to get one of them. Cheers, Hartwig
  11. Regarding Video PowerSupply from the Main battery I did a couple of tests with various regulators. Here are my results: As long as the voltage of the main battery stays above 6V, the LM2940 5.0 along with its two caps works very well, no additional reg required. If the voltage drops below that, you get horizontal lines from the motor in the video picture. So if you want a clear video picture with just one battery on board, make sure the voltage at the input pin of the linear reg 2940 5.0 stays well above 6V, so it has sufficient headroom to do its work. Also it shouldn't be much higher th
  12. Have a look at this: http://webpages.csus.edu/~heinega/Two_Came...cuit_Design.htm Also another project on this page: http://www.petesprojects.com/stereo-video/index.htm Generally you need two cameras which sync-locked to eachother. It's easier to do with CMOS cams but they have several drawbacks. Picture quality isn't as good as with CCD's, and the sync doesn't always work perfect, the slave cam might reset white balance and shutter as well on every sync pulse it gets from the master. Best way to go is to buy two identical CCD boardcams capable of accepting external sync (preferab
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