Comment on my antenna please.

Discussion in 'CB Radio Forum' started by Snailexpress, Aug 13, 2023.

  1. Snailexpress

    Snailexpress Road Train Member

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    New cable to OEM Volvo antenna. Why impedance is 100 Ohm? Screenshot (50).png
     
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  3. Ridgeline

    Ridgeline Road Train Member

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    cable length 50.3 meters??

    terminate the end of the coax with a 50 ohm load and see what happens.
     
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  4. Ridgeline

    Ridgeline Road Train Member

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    no comments from the experts?

    Wow ... just wow.
     
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  5. Xcis

    Xcis Medium Load Member

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    Sorry, I am not an expert but here is my opinion. This sounds like the multiplex system from hell. Multiplexing different signals on one system - proof technology is not always the best solution. This is why more people are bypassing what the truck came with and installing their own 50 ohm coax between the antenna on the driver's door and the CB radio. The KISS method: simple, cheap and very effective fix.
     
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  6. Snailexpress

    Snailexpress Road Train Member

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    OEM system bypassed with 18 feet cable from truck stop. Antenna installed on the rear of the Volvo sleeper. Cable itself with 50 ohm load attached is OK SWR 1.01. Antenna itself is OK with SWR 1.08. But connected together system is not what i expect.
     
  7. Night Stalker10

    Night Stalker10 Road Train Member

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    Is your Nano vna still showing an impedance of 100 ohms? What's the reading for 27.205?

    Edit: What radio and antenna are you using? Are you only talking and receiving a mile or two?
     
    Last edited: Sep 1, 2023
  8. Snailexpress

    Snailexpress Road Train Member

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    Yes, receiving is bad. Radio Anytone working good in my bud truck. Cable with dummy load at the antenna end tested OK. Antenna tested OK with VNA connected directly to antenna.
     
  9. Night Stalker10

    Night Stalker10 Road Train Member

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    What's the RL (return loss) of your antenna system according to the Nano on channel 20?
     
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  10. Snailexpress

    Snailexpress Road Train Member

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    -2.28 dB
     
  11. Night Stalker10

    Night Stalker10 Road Train Member

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    Okay, that's not good. Your problem is due to a lack of RF ground. It's a common problem with today's trucks. Even though guys driving Volvo trucks claim the trucks have metal in the cabs, they still seem to have the same problem as other trucks have with their CB antenna system.
    You need to add ground straps to the cab. It's known as bonding. Here's a great website that explains it.

    Bonding

    If this doesn't solve the problem, then I'm not sure what would.
     
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