CB Goes FM

Discussion in 'CB Radio Forum' started by Timin770, Jul 31, 2021.

  1. Timin770

    Timin770 Road Train Member

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    "The addition of FM as a permitted mode will not result in additional interference because users who hear unintelligible audio on a particular channel can simply select another channel or switch modes."
     
    Last edited: Jul 31, 2021
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  3. Antinomian

    Antinomian Road Train Member

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    The funny thing is the Brits lobbied for years to be allowed to use AM instead of FM.
     
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  4. Timin770

    Timin770 Road Train Member

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    Like the YouTube dude said, I think they should allow FM on a few channels. Not all 40
     
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  5. Meteorgray

    Meteorgray Heavy Load Member

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  6. jessejamesdallas

    jessejamesdallas Road Train Member

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    :D it would most likely be done the same way SSB is done...you can use it on any channel you want, but most people will go to certain channels to talk on it...IMO it's "not" something worth looking forward to... If it was all that great, then why would the Brit's be wanting to use AM legally? "Because FM sux!":p
     
  7. Antinomian

    Antinomian Road Train Member

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    FM doesn't suck. It just doesn't have the same range. That might not be so bad since nearly all CB conversations nowadays happen in truck stops and at traffic backups anyway.
     
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  8. Ridgeline

    Ridgeline Road Train Member

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    you guys … 10 meter fm, 120 miles with 100 watts.

    I think the reason why fm isn’t used in the 11 meter band here in US is the National Telecommunications and Information Administration.
     
  9. Night Stalker10

    Night Stalker10 Road Train Member

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    Hmmm... sounds like the CB industry is trying to give the GMRS industry a run for their money. I believe GMRS radios are FM.
     
  10. Timin770

    Timin770 Road Train Member

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    IIRC anytime I accidentally transmit on FM it makes the SWR run high. I wonder if a person would need a different Antenna set up if they are going to run on FM
     
  11. drivingmissdaisy

    drivingmissdaisy Medium Load Member

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    No, FM vs AM is irrelevant as far as SWR. An antenna doesn't care about FM or AM, only the frequency of the signal. You're getting a high SWR because your SWR meter can't read FM if it's for CB, as that is an AM signal. You would need an appropriate SWR meter for that frequency, FM. FM or AM only have to do with the modulation type of the signal, not the frequency. SWR only goes up if you change frequencies, not modulation types. It's the same reason why when you have an illegal CB amp if you want to use it on AM or SSB you have to select that with a switch on the amp itself.

    Just like TV antennas don't care about digital vs analog signals. TV is still the same frequencies that it's always been. Just the TYPE of signal sent at those frequencies is different. This is why there is no such thing as a digital "HD" antenna. The old TV antennas work perfectly well with the new digital signals. You just need the proper receiver inside the house to convert the digital signal into a picture. Whether or not the signal is HD or not is determined by the transmitter, not the antenna on the receiver.
     
    Last edited: Aug 1, 2021
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