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SSTV?

Discussion in 'Ham Equipment' started by Se7en, Mar 16, 2012.

  1. Se7en

    Se7en Well-Known Member

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    Is this SSTV?



    Sstv ? - YouTube
     
    #1

  2. IMD262

    IMD262 Well-Known Member

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    #2
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  3. hookedon6

    hookedon6 W9WDX Amateur Radio Club Member

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    no,...........it's not even in the band
     
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  4. Se7en

    Se7en Well-Known Member

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    Oh ok. Once I can get my sound interfaced with the pc id like to get into sstv. A local club was doing sstv on a 2m repeater the other night. I thought maybe this video I took was sstv. My bad
     
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  5. W5LZ

    W5LZ Crotchety Old Bastard

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    WARNING!

    That stuff is habit forming. Indulge at your own risk.
    - 'Doc
     
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  6. Highlander_821

    Highlander_821 Amour d'Ecosse

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    That's no lie. When I first got my SSTV setup working properly I was up for like 24 hours! "Just one more pic...."

    When I finally went to sleep I was still hearing that "deedle-deedle dee-dee" opening sound in my head!
    :laugh:
     
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  7. W5LZ

    W5LZ Crotchety Old Bastard

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    Yeah, but it's fun. I think I've used every program ever made for SSTV at one time or another. Also had to make my own interface to start with (RS 555 chip and a few other doogees) can't remember what the original computer software was, but it was a Royal PITA. 'ChromaPix' was -the- thing to have for a long time, did all sorts of things. 'MMSSTV' was a late-comer, and simplified things a lot (and it's still free!).
    The one thing you found out very quickly was that if you ever sent a picture of yourself, you WOULD get it back modified in every fashion you would never believe! The 'National Enquirer' can't hold a candle to an SSTV'er for making up things. :)
    - 'Doc
     
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  8. hookedon6

    hookedon6 W9WDX Amateur Radio Club Member

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    try 14.230 analog (mmsstv, ect)

    or 14.233/7.173 digital (EASYPAL)
     
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  9. Se7en

    Se7en Well-Known Member

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    Ahahaha that's too funny about a picture of ur self returns bonkers.
    The other night they were using there microphone to tx the pictures.
     
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  10. W5LZ

    W5LZ Crotchety Old Bastard

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    Microphones aren't the best way of doing it. Any ambient/room noise will show up on the picture, won't be 'closed circuit'. But it does work.
    - 'Doc
     
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  11. Se7en

    Se7en Well-Known Member

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    #11
  12. Se7en

    Se7en Well-Known Member

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    #12
  13. hookedon6

    hookedon6 W9WDX Amateur Radio Club Member

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    you REALLY need some sort of isolation and attenuation between the rig and the 'puter.

    opto-isolaters are cheap and prevent ground loops/ hummmmmmmm/ect
     
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  14. W5LZ

    W5LZ Crotchety Old Bastard

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    That isolation is a bigger biggy than you might think, it can get really aggravating (radios and computers do not like each other much). And one way of doing that isolating is by means of a transformer to handle any impedance differences between that radio's output and the sound card's input. Two birds, one stone. Sometimes that transformer isn't quite a enough, and if so, adding a 0.001 or 0.01 ceramic capacitor in the 'hot' line at the transformer tames it a bit more. The same basic thing is applicable for the line from that sound card's output to the radio's audio input (isolation).
    One thing that can creep up on you is the difference in ground potential between radio and computer. That amounts to where you happen to find a common ground with the computer. The 'ground' of that sound card's cable is seldom if ever the computer's chassis ground, that sound card 'floats' above ground. Have you ever connected the sound card's ground to chassis ground and had the computer die/turn off? That's a scary occasion! Not sure if it's still true of the newer computers, and I don't plan to find out. Much simpler to just do it right to start with.
    Controlling the audio levels in/out of both the computer and radio can get really aggravating too. It can be done, but usually means adjusting volumes when you so SSTV (or other modes using the sound card) by the SSTV'er. Just remember to readjust those levels when you're finished so that 'normal' sound card operation is restored. Remember that 'aggravating' thingy, just more of it. OR, just get an interface that does all that by it's self, if you don't wanna make one, or are too lazy to do all that adjusting stuff (--> ME). they also are nice because they take care of doing all the connections/connector finding and installing much easier. That makes it sound like I think you should get an interface, but that's really not what I'm saying. Doing it all your self is very nice and certainly possible! If you don't need all those 'refinements', or 'extras', for your particular equipment then good!
    And the same old warning again, this crap really get's addicting...
    Have fun!
    - 'Doc

    And while I'm thinking about it, that interface (store bought or home made) will usually work for any mode that uses the sound card, not just SSTV.
     
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  15. Se7en

    Se7en Well-Known Member

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    Got my Sound card this Afternoon installed it hooked the Icom to it went on 10m did a quick PSK31 test and it works no feedback issues with TX.
     
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