|
|
|
Coax Table
|
|
#
|
impedance
|
attenuation db per 100'
|
velocity
|
max voltage
|
|
|
@ 50MHz
|
@ 1GHz
|
|
RMS kv
|
|
RG6U
|
75
|
1.5
|
11
|
78% (foam)
|
0.6kv
|
|
RG8U
|
52
|
1.2
|
9
|
66 (polyethlene)
|
5kv
|
|
RG8U
|
50
|
1.1
|
|
78 (foam)
|
0.6
|
|
RG8X
|
50
|
13.5
|
|
|
2.5
|
|
RG11U
|
75
|
1.3
|
9
|
66 (poly)
|
5
|
|
RG11U
|
75
|
1.0
|
|
78 (foam)
|
0.6
|
|
RG55B/U
|
53.5
|
|
16.5
|
|
1.9
|
|
RG58U
|
53
|
3.1
|
20
|
66 (poly)
|
1.9kv
|
|
RG58U
|
50
|
3.2
|
|
78 (foam)
|
0.2kv
|
|
RG59U
|
73
|
2.4
|
11.5
|
66 (poly)
|
2.3
|
|
RG62U
|
93
|
1.9
|
8.5
|
84 (air & poly)
|
0.7kv
|
|
RG59U
|
75
|
2.1
|
|
78 (foam)
|
0.3kv
|
|
RG71U
|
93
|
1.9
|
8.5
|
84 (air & poly)
|
0.7
|
|
RG108A/U
|
78
|
|
26.2
|
|
1.0
|
|
RG122U
|
50
|
4.5
|
29.2
|
66 (poly)
|
1.9
|
|
RG140U
|
75
|
|
13
|
|
2.3
|
|
RG141U
|
50
|
2.1
|
13
|
69 (teflon)
|
1.9
|
|
RG142U
|
50
|
2.7
|
13
|
69 (teflon)
|
1.9
|
|
RG178U
|
50
|
10.5
|
45
|
69 (teflon)
|
1.0
|
|
RG179U
|
75
|
8.5
|
25
|
69 (teflon)
|
1.2
|
|
RG180U
|
95
|
4.6
|
16.5
|
69 (teflon)
|
1.5
|
|
RG187U
|
75
|
8.5
|
25
|
69 (teflon)
|
1.2
|
|
RG188U
|
50
|
9.6
|
30
|
69 (teflon)
|
1.2
|
|
RG196U
|
50
|
10.5
|
45
|
69 (teflon)
|
1.2
|
|
RG303U
|
50
|
2.1
|
13
|
69 (teflon)
|
1.9
|
|
RG302U
|
75
|
|
13
|
|
2.3
|
|
RG316U
|
50
|
9.4
|
30
|
69 (teflon)
|
1.2
|
|
RG393U
|
50
|
|
7.5
|
|
5
|
|
RG400U
|
50
|
|
13
|
|
1.9
|
|
RG401U
|
50
|
|
7.5
|
(semi rigid)
|
3
|
|
RG402U
|
50
|
|
13
|
(semi rigid)
|
2.5
|
|
RG405U
|
50
|
|
22
|
(semi rigid)
|
2
|
|
RG174U
|
50
|
6.6
|
31
|
66 (poly)
|
1.5
|
|
RG210U
|
93
|
|
3.1
|
|
0.75
|
|
RG213U
|
50
|
1.6
|
9
|
66 (poly)
|
5
|
|
RG214U
|
50
|
1.6
|
9
|
66 (poly)
|
5
|
|
RG217U
|
50
|
|
5.8
|
|
7
|
|
RG218U
|
50
|
|
3.8
|
|
11Kv
|
|
RG219U
|
50
|
|
3.8
|
|
11
|
|
RG223U
|
50
|
3.1
|
16.5
|
66 (poly)
|
1.9
|
|
RG225U
|
50
|
|
7.5
|
|
5
|
|
RG9U
|
51
|
|
1.6
|
66 (poly)
|
5
|
|
ethernet
|
50
|
1.2
|
|
78 (foam)
|
0.6
|
|
22B/U twisted pair
|
95
|
2.1
|
|
66 (poly)
|
|
|
twin lead
|
300
|
0.8
|
|
80 (poly)
|
|
|
8281
|
75
|
|
9.2
|
|
2.9
|
|
9913
|
50
|
|
4.5
|
|
0.6
|
|
9914
|
50
|
|
6
|
|
0.6
|
|
8218
|
75
|
|
20
|
|
0.6
|
|
The attenuation curves generally follow a straight line when drawn on log-log graph paper. The slope is such that a coax with 2dB at 50Mhz will be 0.8 at 10Mhz. Most coaxes
have about the same slope. What causes this attenuation is mostly the "skin effect" on the center conductor. So, one need only look at the same freq when comparing attenuations when selecting which coax you're gonna use from under the shack table (not strictly true, but close enough for "goverment" work! :-). Voltage ratings: note that foam dielectric cannot take as much voltage as solid dielectric.
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73 de WA2ISE
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