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Internet Message Format  |  1998-02-02  |  5KB
  1. From: wa2ise@netcom.com (Robert Casey)
  2.  
  3.  
  4. COAX TABLE
  5.  
  6. Got out the Belden & Pasternack catalogs.  
  7. Far as I know, the RG numbers look random.  Probably assigned by a clerk 
  8. in the Pentagon during WW2.  Below is a short table
  9. of the various coaxes and the more important characteristics.
  10.  
  11.   #   impedence         attenuation per 100'    velocity      max voltage RMSkv
  12.                           @ 50MHz    @ 1GHz   
  13. RG6U      75               1.5 dB     11 dB        78% (foam)          0.6kv
  14. RG8U      52               1.2         9           66  (polyethlene)   5kv
  15. RG8U      50               1.1                     78  (foam)          0.6
  16. RG8X      50                          13.5                             2.5
  17. RG11U     75               1.3         9           66  (poly)          5
  18. RG11U     75               1.0                     78  (foam)          0.6
  19. RG55B/U   53.5                        16.5                             1.9
  20. RG58U     53               3.1        20           66  (poly)          1.9kv
  21. RG58U     50               3.2                     78  (foam)          0.2kv
  22. RG59U     73               2.4        11.5         66   (poly)         2.3
  23. RG62U     93               1.9         8.5         84  (air & poly)    0.7kv
  24. RG59U     75               2.1                     78  (foam)          0.3kv
  25. RG71U     93               1.9         8.5         84   (air & poly)   0.7
  26. RG108A/U  78                          26.2                             1.0
  27. RG122U    50               4.5        29.2         66  (poly)          1.9
  28. RG140U    75                          13                               2.3
  29. RG141U    50               2.1        13           69  (teflon)        1.9
  30. RG142U    50               2.7        13           69    "             1.9
  31. RG178U    50               10.5       45           69    "             1.0
  32. RG179U    75               8.5        25           69    "             1.2
  33. RG180U    95               4.6        16.5         69    "             1.5
  34. RG187U    75               8.5        25           69    "             1.2
  35. RG188U    50               9.6        30           69    "             1.2
  36. RG196U    50               10.5       45           69    "             1.2
  37. RG303U    50               2.1        13           69    "             1.9
  38. RG302U    75                          13                               2.3
  39. RG316U    50               9.4        30           69    "             1.2
  40. RG393U    50                           7.5                             5
  41. RG400U    50                          13                               1.9
  42. RG401U    50                          7.5               (semi rigid)   3
  43. RG402U    50                          13                 "             2.5
  44. RG405U    50                          22                 "             2
  45. RG174U    50               6.6        31           66   (poly)         1.5
  46. RG210U    93                          3.1                              0.75
  47. RG213U    50               1.6        9            66    "             5
  48. RG214U    50               1.6        9            66    "             5
  49. RG217U    50                           5.8                             7
  50. RG218U    50                           3.8                            11Kv
  51. RG219U    50                           3.8                            11
  52. RG223U    50               3.1        16.5         66    "             1.9
  53. RG225U    50                           7.5                             5
  54. RG9U      51               1.6                     66    "             5
  55. ethernet  50               1.2                     78  (foam)          0.6
  56. 22B/U     95 twisted pair  2.1                     66  (poly)            ?
  57. twin lead 300              0.8 <-worse when wet!   80  (poly)            ?
  58. 8281      75                           9.2                             2.9
  59. 9913      50                           4.5                             0.6
  60. 9914      50                           6                               0.6
  61. 8218      75                          20                               0.6
  62.  
  63. these are all the RG#'s I found.  The attenuation curves generally
  64. follow a straight line when drawn on log-log graph paper.  The slope is
  65. such that a coax with 2dB at 50Mhz will be 0.8 at 10Mhz.  Most coaxes
  66. have about the same slope.  So, one need only look at the same freq
  67. when comparing attenuations when selecting which coax you're gonna use
  68. from under the shack table (not strictly true, but close enough for
  69. "goverment" work! :-)  ).  Voltage ratings: note that foam dielectric
  70. cannot take as much voltage as solid dielectric.
  71.  
  72. 73 de WA2ISE      
  73.  
  74.