## What is the maximum symbol rate permitted for RTTY or data emission transmissions on the 2 meter band?

[G1C11]

A. 56 kilobaud

B. 19.6 kilobaud

C. 1200 baud

D. 300 baud

The answer is **B. 19.6 kilobaud.**Â But why?Â It has to do with the amount of bandwidth used by a signal.Â 1200 and 300 baud take up a very small amount of bandwidth, which is useful on the HF bands, but not so much on 2m.Â You can still use these rates on 2m, but it isnâ€™t required.Â 56kbaud would require too much bandwidth on 2m.

The reason for this goes all the way down to the wavelength of the signal.Â In order to pack more symbols into a given space of bandwidth, you need smaller wavelengths.Â HF wavelengths are relatively long, so you either need a larger bandwidth, or a slower rate to transmit the same number of symbols.Â At higher frequencies, the wavelength shrinks, so you can fit more variance, and therefore more symbols, in a given passband.

Refer to 97.305(c) and 97.307(f)(5) for more information.

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