If I break off one of the two antennas will it prevent the radio from transmitting?

Discussion in 'CB Radio Forum' started by while parked, Jan 4, 2020.

  1. while parked

    while parked Bobtail Member

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    I was in a spare truck the other day (not assigned to anyone) and I broke one of the antennas off when I hit some branches. There was antenna on each mirror. The CB radio does not transmit. I tested it by trying to talk to a driver sitting in the truck next to me. I figured it should still transmit if it still has one antenna so maybe the radio didn't transmit before I got in and broke the antenna. I am guessing, though, that the broken antenna is the problem. Still I don't understand why since there is still another one.
     
  2. Ridlingdj

    Ridlingdj Medium Load Member

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    Are you sure they are both hooked up and not a dummy or is the cable broke going to that one did you try putting the antenna on the other side
     
  3. while parked

    while parked Bobtail Member

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    I don't know if it's a dummy. All of our trucks have an antenna on each mirror. No I didn't try putting the antenna on the other side. So if that other antenna ISN'T a dummy, do you think the radio should stilll transmit? I will go to the yard this weekend and have a look at the other one to see if it is a dummy, but I don't know why it would be?
     
  4. Ridgeline

    Ridgeline Road Train Member

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    What truck and year would help
     
  5. while parked

    while parked Bobtail Member

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    Really? I thought it was a CB radio and antennas operated the same regardless of the year and make of the truck? I guess I'm in over my head. I was looking for CB radio 101 information. I don't know much about CB radios at all. I am not over-the-road, I just do local stuff, and we rarely use a radio.
     
    Ridlingdj Thanks this.
  6. D.Tibbitt

    D.Tibbitt Road Train Member

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    I had the same thing happen except mine got ice fog frozen to it and snapped in half. U can still transmit but ur swr will be thru the roof which is bad for the radio.
     
  7. 25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    Some truck makes switched from cophase to separate antennas that looked identical but were used by in dash for right, usually, and cb for the left.


    Cascadia in 2013 was cophase with a splitter, one of the worst setups I ever had. It was a midroof.

    The newer ones with hidden antennas seem better.
     
  8. GFTLLC

    GFTLLC Bobtail Member

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    It should still transmit if it is broken but I will second the above swr comment. I believe I have heard it will burn the finals in the radio after some time.

    Not sure on the make of the radio but I have a cobra with a gremlin in the dynamic knob that shows it's face from time to time. Could be a mic issue also. Does the needle move when it is keyed up?
     
    D.Tibbitt Thanks this.
  9. while parked

    while parked Bobtail Member

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    Dec 18, 2013
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    We have late model Volvos. There is an antenna on each mirror. The antennas are matching white. The needle does not move when I mic it. After I broke off the antenna, I parked next to a coworker and asked if he could hear me on the radio, and he could not. I could hear him, though. The antenna that broke is on the passenger side. Dumb question, do those antennas have cables that go into them? I was thinking I could take one from another truck and put it on.
     
  10. Tb0n3

    Tb0n3 Road Train Member

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    Dual antennas require both to be there. If they're both active then one broken off will seriously impact your radio and could kill it. The cabling is designed to equal both out and make it 50 Ohm, so the dual uses two 75 Ohm cables. You break one and you significantly increase the impedance.
     
    D.Tibbitt and while parked Thank this.
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