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zactommo

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About zactommo

  • Rank
    RC-Cam Visitor
  • Birthday 10/01/1989

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  • Location
    New Zealand
  • Interests
    Music, Technology, Broadcasting
  1. Okay, so I found a couple of online tools for calculating what components I need in the LC Filter circuit, but some of the values i'm not to sure about. I was looking at: http://www.wa4dsy.net/filter/hp_lp_filter.html I'm not quiet sure what poles means, and what is the frequence I am trying to filter? The 2.4ghz of the TX, or the frequencies of the video signal? I guessed it was 50 Ohms for the other value. I found another calculator: http://www-users.cs.york.ac.uk/~fisher/lcfilter/ but that had a whole lot of values I didn't understand! The actually circuit itself looks very simple, its finding out the values of the componenets that seems difficult Thanks for you help
  2. I tried it out using a standard 9V Alkaline as I didn't have anything beefier on hand, and it fixed the horizontal lines issues. There still was some noise, but it was a vast improvement! (Was still using a AC/DC PLug pack on the RX) You mentioned filtering; if I add a DC filtering circuit in there, will it allow me to power the TX and RX from the plug packs? I was having a read of this page: http://www.play-hookey.com/ac_theory/ps_filters.html Is that the sort of thing I need to do? Thanks for your help!
  3. Details of the power supply. Its a LM317 voltage regulator, I was running 12v in, but it gets too hot, so now its running 5V input. The AC/DC plug pack is 5v DC regulated, rated at 1A. The output of the LM317 has two capacitors on the output, for smoothing I would guess. 1) 10uF 16v, 2) 0.1uF. Also has a 25V 470uF cap on the input. The RX is a prebuilt one from DPCAV, so I assumed it would be okay, but I could be wrong. http://www.dpcav.com/xcart/product.php?productid=16243&cat=249&page=1 And the camera is outputs a clean signal. Its a Sony PD-170, and I uses it regularly for Pro work, and stuff for broadcast, so the noise isn't coming from there. I'm recording the output on a Sony GV-D900 Portable DV Deck. When I connect the camera directly to that it looks good! I hope thats enough detail, let me know if you need to know more! Thanks
  4. Link it Video: http://img684.imageshack.us/img684/3484/sequence1programstream.mp4 Unfortunately when I uploaded it it was recomposed to MPEG4, so its not as obvious.
  5. Thanks to the help i've got from this forum, I've got to the stage where my TX is working, which is good news, but I have some video quality issues that i'd like to sort out. What i'm seeing in my picture outputting from RX is what looks like horizontal lines the the picture, that are moving up and down the picture, and some noise in the picture. It gives the picture a cheap VHS sort of look to it. I'll attach a couple of still frame from the output of the RX, but it is more obvious seeing it in a video, which I will try to upload that too. I'll also attach a photo of my TX so you can see the layout (don't laugh) and provide some feedback about what I could improve to get better picture quality. I had a couple of thought about what it could be, tell me what you think 1) Pin 14 which is labelled Ground on the schematic is connecting to the -VE of the Video Input BNC plug, instead of the common ground like all the other GND Pins 2) Maybe i've stuffed up how i've installed the smoothing capacitor on the 3.3V line, or the capacitor on the bypass line? Thanks in advance for your help!!
  6. Yes, that is a fair comment! Really, the high priority for this project is to get the best range possible out of the units. In general terms, how much loss am I looking it?
  7. Mounting the SMA connector onto the module sort of stuffs up my whole layout, but if thats the only option, then it might be what I have to do. I know you can buy cable especially for those SMA type connects, which I assume would be the right impedance, but I haven't found where I can get it from quiet yet. So assumming I can find the cable, if I replaced my current N connector with a flush mounted sma, then used say, 2-3cm of that cable to connect to the airwaves module, would that do the trick? I'm just worried that mounting it straight to the module will 1) Make the layout of the internals of my enclosure very limited, and difficult 2) Put alot of pressure on that connector, and in turn the module, probably causing it to fail at bad time. Thanks for your help!!
  8. Please excuse my ignorance, and starting up a thread that has been dead for a while. I just wanted to clarify something so I don't stuff up the potential output of my TX. I'm using an airwaves 633, and mounting it in an enclosure, and instead of using a SMA connector, i'm using one like this: http://www.jaycar.co.nz/productView.asp?ID=PS0674&CATID=35&form=CAT&SUBCATID=433 (sorry can't remember what you call them) So mounting the connector directly to the Airwaves module is out of the question. So if I use cable rated at 50ohm, like RG58 or RG174, and solder that directly to the output of the airwaves module, then onto my connector, does that provide the correct line impedance or whatever to maximise the output power of my TX? FYI the TX is connecting to a +24db Grid attenna with the intention of a long range video link. Also, would it be wise to use 75ohm for my video input, and correct audio cable for my audio input to make sure a maximise the quality of everything? Thanks for your help, you guys knowledge is amazing!
  9. What a great forum! I'm glad I stumbled upon this. I'm looking at using 2.4ghz video technology for a point to point wireless video link, and it seems like these Airwaves modules are the best out there. I'm thinking of using the 633/634, but the problem I have is where the heck to I purchase them from. I'm not in the US, actually in New Zealand in fact. I can't find anyone in the country who has links with Airwaves, so i'm going to have to import them somehow. Where do you guys purchase from. I see Mark Harris is in Australia, and he purchased directly from airwaves. Maybe that would be the best option. Let me know your thoughts Thanks Isaac
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