I'm setting up digital modes for the first time and want to make sure I understand the new bandwidth limitations that went into effect January 2024. The FCC replaced the old baud rate limits with a 2.8 kHz bandwidth limit on many HF bands, but I'm confused about what this means practically.

Can someone break down the key steps to ensure my digital operation stays within Part 97 compliance? Also, what are the best tools or methods to verify my signal bandwidth before transmitting?

Key steps for digital compliance:

• Use software that shows occupied bandwidth (like WSJT-X spectrum display)
• Check your radio's bandwidth settings - most modern rigs have built-in filters
• Remember that as control operator, you're responsible for ensuring compliance with FCC rules
• When in doubt, use established modes like PSK31 or FT8 which are well within limits

A good SDR waterfall display is your best friend for checking bandwidth. I use SDR# alongside my transceiver to visually confirm my signal stays within the 2.8 kHz limit.

Thanks for asking this! I was wondering the same thing as a new Tech. The bandwidth rules apply to specific band segments - not all amateur frequencies have the same restrictions.