From : Steve Lampereur To : CATV - United States Subject: Cable TV leakage on Amateur radio frequencies Part 76 of the FCC Rules pertains to Cable Television Service. Here is a list of the Standard USA EIA CATV channels and their frequency mapping that overlaps amateur radio spectrum. EIA CATV Standard Frequencies Channel Video Sound Color Time Warrner Channel 18 145.25 149.75 148.83 Comedy 24 223.25 227.75 226.83 57 421.25 425.75 424.83 CNBC 58 427.25 431.75 430.83 SCIFI 59 433.25 437.75 436.83 60 439.25 443.75 442.83 ENC 61 445.25 449.75 448.83 HALL 142 901.25 905.75 904.83 143 907.25 911.75 910.83 144 913.25 917.75 916.83 145 919.25 923.75 922.83 146 925.25 929.75 928.83 A cable system is defined as a facility consisting of a set of closed transmission paths and associated signal generation.. [76.5] Therefore a cable TV system is Not supposed to intentionally radiate any signals. Annually cable systems need to file "a basic signal leakage report" along with other performance test data to maintain compliance with the technical standards section. Cable companies are somewhat frequently tested for leakage in spectrum shared with the aeronautical frequency bands by the FCC by way of a "fly over inspection." However it is usually possible to monitor leakage especially on the listed audio frequencies very easily with a standard receiver. I encourage all hams to check for leakage especially on frequencies shared with repeater inputs/outputs. If you notice leakage beyond Part 15 field strengths do not hesitate to contact your local cable provider: Part 76.305 "Records to be maintained locally by cable system operators for public inspection" -States a public inspection file shall be available at any time during regular business hours and shall contain records of signal leakage logs and repair records. The file shall be maintained at the offices used for ordinary collection of subscriber charges, resolution of subscriber complaints and other business. Time Warrner Cable Television Scott Phillips - Director of Technical Operations 1001 Kennedy Ave. Kimberly, WI 54136