Janis AB2RA made comments:

This is a powerful well funded coalition. The ARRL successfully contested the Broadband over Power Lines initiative. That was a clear cut case though, due to the potential interference being directly in the amateur spectrum. This time, its in Part 90 spectrum adjacent to our Part 97 spectrum.

In this case, the primary issues are raising the noise floor and overload experienced by certain SDR radio designs which do not have a narrow high Q RF preselector (one example being the popular IC-7300, for instance).

The rise in noise floor has been well understood for some time. This white paper by W8JI the designer of the most popular amplifiers and many pieces of test gear is a good summary: Mixing Wide & Narrow Modes, W8JI: https://www.w8ji.com/mixing_wide_and_narrow_modes.htm

However, a more immediate threat to RTTY/DATA/CW is the one posed by RM-11708 and WT Docket No. 16-239.

This may be acted on very soon. The ARRL Board of Directors meets next weekend. Please contact them to endorse their ARRL HF Band Planning Committee's work as an immediate solution to this threat. You may want to comment on the commercial spectrum action also.

Our FCC filing explaining this: https://www.fcc.gov/ecfs/document/107132531002838/1

73, Janis AB2RA

 

They are. They were talking about it in today’s weekly ARRL Letter.

73 

David 

N1EA