Forum: d0p3 BBS

[K0NR] Adios Symbol Rate Limit

From K0NR via rec.radio.amateur.moderate@3:633/280.2 to All on Mon Oct 30 14:33:37 2023

Post : Adios Symbol Rate Limit
URL : https://www.k0nr.com/wordpress/2023/10/adios-symbol-rate-limit/ Posted : 29 October 2023 at 9:33 pm
Author : Bob K0NR
Categories : FCC, Ham Radio, HF, VHF/UHF

https://www.k0nr.com/wordpress/wp-content/uploads/2023/10/OBW-measurement.jpg The FCC will be voting on and will likely approve a Report and Order ( https://docs.fcc.gov/public/attachments/DOC-397992A1.pdf ) that eliminates
the symbol rate restriction on HF data transmissions, replacing it with a bandwidth limit of 2.8 kHz. See FCC To Vote on Removing Symbol Rate Restrictions ( https://www.arrl.org/news/fcc-to-vote-on-removing-symbol-rate-restrictions )
.. The symbol rate limit of 300-baud is an obsolete way of limiting the signal bandwidth, created back when the data transmissions were predominately Frequency Shift Keying ( https://en.wikipedia.org/wiki/Frequency-shift_keying
) (FSK). It was a simple, practical way to regulate the bandwidth at that
time but technology has moved on. The use of digital signal processing and efficient wireless encoding techniques require a better approach to bandwidth regulation.

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