Wednesday 14th June 2023
    Difficulty: Medium

    CB radio (Quiz #208)

    Photo by <a href="https://unsplash.com/@rhysatwork?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Rhys Moult</a>
    Photo by Rhys Moult (Unsplash)

    CB (Citizens Band) radio is a system of short-range radio communication on a selection of 40 channels within the 27-MHz band in the UK. CB was initially very popular, due in part to the film Convoy, but its use dwindled after the invention of mobile phones.

    1. When CB radio was first introduced in the UK, it used the 27 MHz radio band. Why did this cause problems?

    2. When CB radio was introduced in the UK, 40 channels were available on the 27 MHz band, numbered 1-40. On which channel would the non-lorry driving public call up to talk to someone?

    3. In CB radio code, what is meant by "10-20"?

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