15 Miles DATV Transmission On 1.2GHz - Here's what I used!

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  • Опубликовано: 25 янв 2025

Комментарии •

  • @cuisinartOH1
    @cuisinartOH1 13 дней назад +21

    This channel has the best audio of the 100+ channels I'm subscribed to. Sometimes I watch an episode I'm not interested in just to hear the good audio quality.

    • @TechMindsOfficial
      @TechMindsOfficial  13 дней назад +1

      Wow, thanks!

    • @ScuffedRadio
      @ScuffedRadio 7 дней назад +1

      For real, it does sound good!

    • @leandroebner1405
      @leandroebner1405 3 дня назад

      ​@@ScuffedRadio it's also his voice. I like his British accent, but the colour of his voice is just SOOO nice to listen to

  • @bartofilms
    @bartofilms 13 дней назад +11

    My Dad was a Ham Operator & Physician. He built a LASER transmitter and small parabolic antenna receiver. He then sent live images from Ultrasound Scanner from his Lab to his home, 3 miles away. It worked for quite a while until the receiver over-heated and caught fire... 😬.

  • @digitalmediafan
    @digitalmediafan 7 дней назад +2

    Such a beautiful location to look out on as you experiment. You are so lucky

  • @jamminwrenches860
    @jamminwrenches860 14 дней назад +8

    As an American it amazes me that you can transmit video to a relay for public consumption. We have public access timeslots on a few large metro areas. Good work.

  • @MartinHiggs84
    @MartinHiggs84 14 дней назад +5

    Well done, I used the analogue setup for GB3TV around 18 years ago.

  • @RobertoRubio-ij3ms
    @RobertoRubio-ij3ms 13 дней назад +3

    One of the coolest videos I have watched in your channel and radio channels in general.

  • @Hungry_Hunter
    @Hungry_Hunter 13 дней назад +2

    Im currently building some ATV capacity into my shack and this has really helped me to visualise a set up.

  • @MakingRadioWaves
    @MakingRadioWaves 7 дней назад

    Matt,
    You can make a 23cm biquad antenna pretty easy using enamelled copper wire and a sheet of copper clad board as its reflector and mount it in a plastic lunch box. Loads of online construction videos, images and calculators.
    The bi-quad can be mounted Horizontally or Vertically, make two! one for Transmit and one for receive.
    If you want more gain then make antennas a "double bi-quad".
    Also if you measure the current on the amplifier and compare it to the specs will give you a rough ideal.
    Used to abit of 23cms/13cms and 3cms ATV back in the days but it was limited to thoses who were able to construct modules like the Comtech boards and Gunn diodes.
    Good luck
    Jason
    M0NYW

  • @NeonLightRays
    @NeonLightRays 13 дней назад +3

    A video on making that yagi would be really neat, I’m sure it will make a huge difference!

  • @stevefisher1036
    @stevefisher1036 11 дней назад +2

    Kudos for doing this. This is exactly what nuts like us do. If you have a wife that didn't roll her eyes, kudos to her too.

  • @vicrod74
    @vicrod74 14 дней назад +2

    Awesome video! This is a excellent test!

  • @stuartmiller6725
    @stuartmiller6725 14 дней назад +1

    Thanks Matt, very interesting. I shall have to have a go at receiving GB3TV from my QTH. Quite a distance though being Norfolk based. But am on high ground. Well, high by East Anglia standards!

  • @PEIIIFS
    @PEIIIFS 13 дней назад

    nice test Matt. nice equipment looking forward to your video about making a Yagi for that freq.

  • @Threlly
    @Threlly 14 дней назад +1

    Great stuff Matt, yep a horizontal yagi and some very low loss coax will be the trick, I'm not sure what you have going up to the vertical but there are probably big losses there too.
    Back in the 90's I did analogue 23cm TV and my amp and tx were mast mounted.

    • @TechMindsOfficial
      @TechMindsOfficial  13 дней назад +1

      I use Formula Zero, which is almost identical to Westflex W103.

    • @Threlly
      @Threlly 13 дней назад

      @@TechMindsOfficial That's good, those units are really small though and that TX can be controlled across a really long stretch of Cat5/6 easily.
      Mast mounting could be a real option! Worth a look?

  • @Subgunman
    @Subgunman 13 дней назад +1

    There are PC board log periodic antennas out there that will cover that range. Not sure how much power they will handle since they are circuit boards with copper trace antenna elements. There was an American Ham who was making and selling these about 20 years ago but I did recently come across a Chinese site that was selling clones of these antennas as well as panel antennas for WiFi and Bluetooth.
    Recently I purchased a low power DATV transmitter that is capable of various formats of digital transmission formats. It is specifically designed for use in a low power in house tv networks within hotels where they can rebroadcast local stations, in-house advertisements, weather info provided by computer as well as composite video all "real time" into a multi coupler to create the in house cable tv system. Have not set it up yet since time does not permit plus I need to find out which of the DATV formats are in use in my region of the EU.

  • @imark7777777
    @imark7777777 10 дней назад

    Well that was way cooler than I thought it would be. Interesting so TV and repeater is not something I would've necessarily thought of but then again that's not very common in the US. There are some low power TV retransmission repeaters but didn't think about that with ham interesting.

  • @unix_fan
    @unix_fan 10 дней назад

    RF is pretty cool stuff

  • @MarkG0MGX
    @MarkG0MGX 8 дней назад

    Most excellent, how did you make that lovely test card in OBS?

  • @mandamiddle0278
    @mandamiddle0278 11 дней назад +1

    hi sir your vids are very helpfull

  • @Davidm-M0TPT
    @Davidm-M0TPT 14 дней назад +1

    So cool Mat

  • @jamess1787
    @jamess1787 13 дней назад

    Try whacking a 45* wedge between the mount and the pipe/mount. Might be able to reduce the loss to ~10dB. (Cross polarized)

  • @bsdjunkie1805
    @bsdjunkie1805 14 дней назад +2

    Hi Matt, did you measure the actual RF strength from the amp at all as these seem very well priced, I could do with a couple but only if the output is over 10w. Cheers for this video, very useful indeed.

    • @TechMindsOfficial
      @TechMindsOfficial  13 дней назад

      Not yet, I need to figure out the best way to measure it, in other words I need to find a reliable power meter for that band :-)

    • @Aitch-Two-Oh
      @Aitch-Two-Oh 13 дней назад +1

      @@TechMindsOfficial it would also be interesting to know the harmonic distortion of the amp. Also those aliex dcdc connectors are pretty noisy ime.

  • @jensgoerke3819
    @jensgoerke3819 13 дней назад

    You could etch a yagi antenna for 23 cm onto a PCB, with the only soldered part being the connector. Weatherproof with hot glue and you've got a suitable (but ugly) antenna for a few quid.

  • @BikerCaf
    @BikerCaf 13 дней назад +1

    Make sure that PA is linear (NOT class C), also check it's harmonic output, you have no LPF'ing at all.

  • @boweandrew3
    @boweandrew3 7 дней назад

    Great video AB9EW

  • @KA4UPW
    @KA4UPW 12 дней назад

    Wonder if I can do that with a ic9700

  • @W4TRI_Ronny
    @W4TRI_Ronny 13 дней назад

    What Lime SDR model would you suggest to start this? Yes to 23CM antenna and please include 3D printing parts if you find a good one. Thanks!

  • @ruhnet
    @ruhnet 13 дней назад

    Very cool! 73s

  • @perhansen8170
    @perhansen8170 13 дней назад

    HI Matt, is this amplifier bidirectional?

  • @tlrptg
    @tlrptg 13 дней назад

    can you measure please the output power of that amplifier?

  • @x_CrossHair_x
    @x_CrossHair_x 12 дней назад

    I would say the (Vertical) Antenna you are using to TX is fine at 1.249 Gig (Vertical).. From what I gather the DTV Repeater Antenna is a "Dual Alford Slot" (Design) also Vertical.. The Only Referance to Horizontal Polorization that I can see for the "DTV Repeater Description".. If you TX on 437 MHz then the Antenna for that is (A Horizontal Loop).. (For audio) and 144.55 2 Meter Receive.

    • @TechMindsOfficial
      @TechMindsOfficial  12 дней назад

      The Alford Slot is an omni-directional horizontally polarized antenna, from what I have been told. Cheers

    • @x_CrossHair_x
      @x_CrossHair_x 12 дней назад +1

      @TechMindsOfficial Ah OK.. What a slick Repeater. Would be fun to have one in my area .. Thanks for posting the demonstration Video.👍

  • @321CatboxWA
    @321CatboxWA 13 дней назад +1

    You flatlanders and your fancy line of sight!

  • @janengelen1978
    @janengelen1978 13 дней назад

    What kind of device is in the power amplifier ? 73 Jan

  • @fernandoblazin
    @fernandoblazin 13 дней назад +2

    Americans how does your beloved HOA love those antennas

    • @plopeye1
      @plopeye1 8 дней назад +1

      Thats why you should never buy an house under a HOA.

  • @N8XS
    @N8XS 12 дней назад

    How are you getting the video feed into your transmission system?

    • @TechMindsOfficial
      @TechMindsOfficial  12 дней назад

      I briefly covered this in the video. I use OSB to gather the Audio and Video, and then DATV Easy you select OBS as the video source. DATV Easy then encodes the video and uses the transmitter to transmit it.

    • @N8XS
      @N8XS 12 дней назад

      @ I guess I asked the question wrong. What does your actual video gathering? I assume it’s some kind of small camera?

    • @TechMindsOfficial
      @TechMindsOfficial  12 дней назад

      OBS Studio. Its an application which can gather audio/video and media sources. Normally designed to encode and stream to streaming platforms. We use OBS to create a virtual camera, which DATV Easy picks up on the same computer. OBS supports screen capture, images, media files and webcams etc.

    • @N8XS
      @N8XS 12 дней назад

      @@TechMindsOfficial Ah!!!! Now I understand. The video of your garden that went to the DATV site was a recording. I had assumed it was live. Thanks!

    • @TechMindsOfficial
      @TechMindsOfficial  12 дней назад +1

      @N8XS it was live, from a webcam plugged into my computer :)

  • @Pedro8k
    @Pedro8k 13 дней назад

    Make a yagi for 1.2 they are simple to make or even mod a small dish you probably don't even need that much power with one

  • @mikewillis1592
    @mikewillis1592 13 дней назад

    That's odd. My post vanished.

  • @Sir-Dexter
    @Sir-Dexter 10 дней назад

    nice work lol

  • @billythebootlegger.4376
    @billythebootlegger.4376 13 дней назад +1

    Excellent work Matt
    de m0zww 73

  • @mandamiddle0278
    @mandamiddle0278 11 дней назад

    can i ask if its possible to make a video about plugins on airspy or sdrpp I seen you have so many plugins mine wont work . like tera is muted cant unmute . i have few but most wont work . i seen you have sooo many .