Friday, November 14, 2014

Article Number: 9890


Cable Frequencies



by THE RESEARCHER





I have been doing a lot of research in recent months on television



signals in terms of both radio frequency and video after demodulation. A lot



of facinating components make up a color television signal. If the signal has



been scrambled to prevent unauthorized reception, it is even more intriguing.



I have examined the signals of two cable companies in West Virginia who



employ scrambling techniques and find that no actual scrambling is being done.



That is, the signals are not "mixed up" in any way. All that has been done is



the horizontal sync and blanking pulses have been suppressed about 6 db below



the peak video level. Except for that modification all the signal components



are intact and in proper sequence. The scrambling occurs inside the TV



receiver because of its inability to locate and lock on to the horizontal sync



pulses.



If you are interested in this kind of experimenting, an excellent series



of articles began in the June 1986 issue of "Radio Electronics" and is



continuing as of this date (August 1986). It may also be of value to know



where the signals you want to work on are located in terms of frequency. If



you have ever wondered where those mid band and super band cable channels are



located, the following table will be enlightening.





Table of CATV Channels VS. Frequency in MHz



---------------------------------------------



! Channel ! ! Video ! Audio !



! Number ! Bandwidth ! Carrier ! Carrier !



!---------------------------------------------!



! T7 ! 5.75- 11.75! 7.0 ! 11.5 !



! T8 ! 11.75- 17.75! 13.0 ! 17.5 !



! T9 ! 17.75- 23.75! 19.0 ! 23.5 !



! T10 ! 23.75- 29.75! 25.0 ! 29.5 !



!---------------------------------------------!



! TV-IF ! 40.0 - 46.0 ! 41.25 ! 45.75 !



!---------------------------------------------!



! 2 ! 54.0 - 60.0 ! 55.25 ! 59.75 !



! 3 ! 60.0 - 66.0 ! 61.25 ! 65.75 !



! 4 ! 66.0 - 72.0 ! 67.25 ! 71.75 !



! 5 ! 76.0 - 82.0 ! 77.25 ! 81.75 !



! 6 ! 82.0 - 88.0 ! 83.25 ! 87.75 !



!---------------------------------------------!



! FM Radio! 88.0 - 108.0 ! ! !



!---------------------------------------------!



! A-2 ! 108.0 - 114.0 ! 109.25 ! 113.75 !



! A-1 ! 114.0 - 120.0 ! 115.25 ! 119.75 !



! A (14) ! 120.0 - 126.0 ! 121.25 ! 125.75 !



! B (15) ! 126.0 - 132.0 ! 127.25 ! 131.75 !



! C (16) ! 132.0 - 138.0 ! 133.25 ! 137.75 !



! D (17) ! 138.0 - 144.0 ! 139.25 ! 143.75 !



! E ! 144.0 - 150.0 ! 145.25 ! 149.75 !



! F (19) ! 150.0 - 156.0 ! 151.25 ! 155.75 !



! G (20) ! 156.0 - 162.0 ! 157.25 ! 161.75 !



! H (21) ! 162.0 - 168.0 ! 163.25 ! 167.75 !



! I (22) ! 168.0 - 174.0 ! 169.25 ! 173.75 !



!---------------------------------------------!



! 7 ! 174.0 - 180.0 ! 175.25 ! 179.75 !



! 8 ! 180.0 - 186.0 ! 181.25 ! 185.75 !



! 9 ! 186.0 - 192.0 ! 187.25 ! 191.75 !



! 10 ! 192.0 - 198.0 ! 193.25 ! 197.75 !



! 11 ! 198.0 - 204.0 ! 199.25 ! 203.75 !



! 12 ! 204.0 - 210.0 ! 205.25 ! 209.75 !



! 13 ! 210.0 - 216.0 ! 211.25 ! 215.75 !



!---------------------------------------------!



! J (23) ! 216.0 - 222.0 ! 217.25 ! 221.75 !



! K ! 222.0 - 228.0 ! 223.25 ! 227.75 !



! L ! 228.0 - 234.0 ! 229.25 ! 233.75 !



! M ! 234.0 - 240.0 ! 235.25 ! 239.75 !



! N ! 240.0 - 246.0 ! 241.25 ! 245.75 !



! O ! 246.0 - 252.0 ! 247.25 ! 251.75 !



! P ! 252.0 - 258.0 ! 253.25 ! 257.75 !



! Q ! 258.0 - 264.0 ! 259.25 ! 263.75 !



! R ! 264.0 - 270.0 ! 265.25 ! 269.75 !



! S ! 270.0 - 276.0 ! 271.25 ! 275.75 !



! T ! 276.0 - 282.0 ! 277.25 ! 281.75 !



! U ! 282.0 - 288.0 ! 283.25 ! 287.75 !



! V ! 288.0 - 294.0 ! 289.25 ! 293.75 !



! W ! 294.0 - 300.0 ! 295.25 ! 299.75 !



!---------------------------------------------!



! AA ! 300.0 - 306.0 ! 301.25 ! 305.75 !



! BB ! 306.0 - 312.0 ! 307.25 ! 311.75 !



! CC ! 312.0 - 318.0 ! 313.25 ! 317.75 !



! DD ! 318.0 - 324.0 ! 319.25 ! 323.75 !



! EE ! 324.0 - 330.0 ! 325.25 ! 329.75 !



! FF ! 330.0 - 336.0 ! 331.25 ! 335.75 !



! GG ! 336.0 - 342.0 ! 337.25 ! 341.75 !



! HH ! 342.0 - 348.0 ! 343.25 ! 347.75 !



! II ! 348.0 - 354.0 ! 349.25 ! 353.75 !



! JJ ! 354.0 - 360.0 ! 355.25 ! 359.75 !



! KK ! 360.0 - 366.0 ! 361.25 ! 365.75 !



! LL ! 366.0 - 372.0 ! 367.25 ! 371.75 !



! MM ! 372.0 - 378.0 ! 373.25 ! 377.75 !



! NN ! 378.0 - 384.0 ! 379.25 ! 383.75 !



! OO ! 384.0 - 390.0 ! 385.25 ! 389.75 !



! PP ! 390.0 - 396.0 ! 391.25 ! 395.75 !



! QQ ! 396.0 - 402.0 ! 397.25 ! 401.75 !



! RR ! 402.0 - 408.0 ! 403.25 ! 407.75 !



! SS ! 408.0 - 414.0 ! 409.25 ! 413.75 !



! TT ! 414.0 - 420.0 ! 415.25 ! 419.75 !



! UU ! 420.0 - 426.0 ! 421.25 ! 425.75 !



! VV ! 426.0 - 432.0 ! 427.25 ! 431.75 !



! WW ! 432.0 - 438.0 ! 433.25 ! 437.75 !



! XX ! 438.0 - 444.0 ! 439.25 ! 443.75 !



! YY ! 444.0 - 450.0 ! 445.25 ! 449.75 !



! ZZ ! 450.0 - 456.0 ! 451.25 ! 455.75 !



---------------------------------------------



The numbers in parentheses are the channel numbers assigned by Capitol



Cablevision in Charleston, WV to their upper tier channels.







DOWNLOADED FROM AND ORIGINALY DISPLAYED ON P-80 SYSTEMS....


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