ARLA/CLUSTER: ARRL propõem o fim às restrições dos 300 baud em HF

[João Costa > CT1FBF]

ARRL propose an end to symbol rate restrictions

Once, the ARRL supported restrictions that limited the symbol rate and
crippled the development of amateur radio HF data modes, now nearly 34
years later they have changed their mind

In 1977 in Docket 20777 the FCC tried to introduce band planning by
bandwidth, it was at the time opposed by ARRL who were successful in
defeating it.

Subsequently, on March 17, 1980, a 300 baud symbol rate restriction on
HF data was introduced with ARRL support. It's intent was to restrict
the bandwidth of data transmissions without actually specifying a
bandwidth restriction since band planning by bandwidth was something
the ARRL bitterly opposed.

The draconian symbol rate restriction limited the ability of US hams
to experiment with and develop new and innovative data modes.

In the September issue of QST the ARRL has announced a new position on
symbol rates. They are now proposing that the FCC delete all
references to symbol rate from Section 97.307(f) of the amateur
regulations and adopt a bandwidth limit of 2.8 kHz for amateur data
emissions below 29.7 MHz. It appears the ARRL proposals would also
eliminate the symbol rate restrictions at VHF and UHF.

Read the ARRL September QST editorial at
http://www.arrl.org/files/media/News/ItSeemsToUs.pdf

FCC 97.307
http://www.gpo.gov/fdsys/pkg/CFR-2011-title47-vol5/pdf/CFR-2011-title47-vol5-sec97-307.pdf