Line A and Line C
E1F06 (FCC Rules)
The A line is a line roughly parallel to and approx. 50 miles south of the US-Canadian border
E1F07 (FCC Rules)
Amateur stations may not transmit on the 420 – 430 MHz frequency segments if they are located north of Line A.
* A Line “A” and Line “C” check is here: http://wireless.fcc.gov/uls/index.htm?job=line_a_c
The FCC Line A Regulations were established during the WARC 79 conference, (World Administrative Radio Conference, 1979) and are meant to protect Canadian Land/Mobile operations near the US/Canadian border from interference. There is a Line B in Canada that mimicks the US Line A, as well as a Line C and D between Alaska and Canada and for the same reason. Originally, the definition of Line A in Section 90.7 is taken from Paragraph 2 of Arrangement A contained in the revised Technical Annex to the agreement between the United States and Canada on the “Coordination and Use of Radio Frequencies Above 30 Megacycles per Second”, signed at Ottawa on June 16 and 24, 1965. Due to the lack of easy to interpret information, I was prompted to wonder what and where the Line A Restrictions physically are, how to map the boundaries it defines, and how it affects Amateur 70 cm Operations, and other Radio Service Operations such as GMRS in the Puget Sound Area.
(More at the link…)
73 de KA4UDX,