Ham Radio General Class Practice Test

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What is the maximum symbol rate permitted for RTTY or data emission transmitted at frequencies below 28 MHz?

56 kilobaud
19.6 kilobaud
1200 baud
300 baud

The correct answer is: 300 baud

For RTTY (Radioteletype) or data emissions transmitted at frequencies below 28 MHz, the maximum symbol rate allowed is indeed set at 300 baud. This limit is established by the FCC regulations regarding the operation of amateur radio stations. Baud rate measures the number of symbols transmitted per second; in the case of RTTY, each symbol can represent more than one bit of information depending on the modulation scheme used. The 300 baud limit primarily comes from the historical context of RTTY operation, which allows for reliable communication while avoiding congestion on the amateur bands. Radios and modems designed for RTTY at 300 baud were among the earliest technologies used in amateur radio, which is why this standard has persisted long after newer, faster technologies were developed. The emphasis on limiting symbol rates helps ensure that the amateur frequencies remain accessible for all operators, particularly at lower frequency bands where congestion can be more pronounced. The other symbol rates mentioned exceed the legal limitations for frequencies below 28 MHz, thereby not being permissible for RTTY operations in these bands. This regulation is important for maintaining orderly use of the amateur radio spectrum and promoting overall good operating practices.