Build a 4 way 75 Ohm RX antenna splitter

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  • Опубликовано: 24 ноя 2024

Комментарии • 12

  • @karlfrederick5731
    @karlfrederick5731 2 года назад +1

    Your videos are a Ham's must view. Excellent series. Nice to see a new video. 73!

  • @bartcalder2791
    @bartcalder2791 2 года назад +2

    Sir, Wow! It's always a learning experience with all you do. More, Please?

  • @fredmoeves8611
    @fredmoeves8611 2 года назад +1

    Steve
    Thanks for another great video.
    Lots of good info in all you're videos thank you very much.
    Fred KB4QZH

  • @runeye5825
    @runeye5825 2 года назад +1

    As always, very educational 73! de LA7THA

  • @gsge
    @gsge Год назад +1

    I just came across your channel and I have to say I found exactly what I was looking for for long time. Your channel presents very informative content in easy to understand commentary. I am not ham radio operator but in some cases I can use this information for higher frequencies designs.
    I need your advice for one of my multiband antenna design for 915 mhz LoRa band, 1575 mhz GPS band and 2.4 ghz WiFi band. I wanted to use this one antenna for all 3 bands at the same time. GPS is only for receiving but other 2 bands receive and transmit. I have following simulated results for all bands:
    Frequency Gain Antenna VSWR Impedence Antenna height
    MHZ DBi Pattern Real Moderate gnd
    915 (LoRa US) 2.28 Omnidiectional 1.64 60.7+j25.50 Free space
    915 (LoRa US) 8.31 Omnidiectional 1.66 60.8+j26.10 3 feet
    1575 (GPS) 3.19 Omnidiectional 7.13 356+j5.83 Free space
    1575 (GPS) 9.21 Omnidiectional 7.12 356+j6.07 3 feet
    2440 (WiFi) 4.53 Omnidiectional 1.63 73.9-j18.00 Free space
    2440 (WiFi) 10.60 Omnidiectional 1.62 73.6-j18.00 3 feet
    My question is how to design either PCB impedance matching network or Coax impedance matching network so that it can be matched to 50 Ohms feed lines.
    Thank you.

  • @n8ux1963
    @n8ux1963 2 года назад +1

    Another useful video Steve - tnx! Which PC board fabricator are you using?

    • @ve6wz
      @ve6wz  2 года назад +1

      I use JLCPCB.

  • @denes44
    @denes44 8 месяцев назад

    To make it 50 Ohm, I only need to change the resistors, 150 Ohm to 100 Ohm and 75 Ohm to 50 Ohm? Also, can this be used in the 470 Mhz range?

    • @ve6wz
      @ve6wz  8 месяцев назад

      Yes, that is correct.
      The only issue is the PCB is designed for 75 Ohm F-connectors, so using those F connectors you would need to use an adapter for a 50 Ohm coax connector.

    • @denes44
      @denes44 8 месяцев назад +1

      @@ve6wzThanks. I'm planning to make my own PCB. But I just found the Mini-Circuits SCA-4-10+, I think I will use that.

    • @ve6wz
      @ve6wz  8 месяцев назад

      That looks like an easy solution if you plan to build up your own board. Numbers look good.

    • @denes44
      @denes44 8 месяцев назад

      @@ve6wz I just posted my splitter+LNA design in the RTLSDR subreddit, I wonder if you could take a look. I have a couple questions, but I cannot post a link to my schematics here.