It is important to note that in many jurisdictions, including the United States, the Federal Communications Commission (FCC) strictly regulates Citizens Band (CB) radio equipment. Under FCC Part 95 rules, CB radios must be type-certified by the manufacturer to operate only on the 40 designated channels within the 27 MHz band.

Here’s a concise, technical write-up for the , commonly performed to expand transmit/receive frequencies beyond the stock 40 CB channels.

. This modification generally opens up the "Low" (C) and "High" (E) bands, adding 40 channels below and 40 channels above the standard CB range. Modification Details Expansion Range:

a popular internal modification allows users to expand its capabilities to 120 channels Unlocking the 120-Channel "Uppers and Lowers" Mod The modification opens up the

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