Feedline Data

This table provides data on a number of common ham feedlines, although there are many more types available.

I have collected these from several sources: data sheets, internet calculators and lists, and some of my own measurements. The numbers may not be entirely consistent: there can be significant variation among products with the same type number, but different construction. And sometimes the manufacturers’ data sheets are not consistent, either.

The notes after the table explain some of the expected variations.

COAXIAL CABLE DATA TABLE

typeZooutside
diameter
mm
(inch)
center
conductor
mm
(inch)
insulationvelocity
factor
weight
g / m
( lb / ft )
dB loss
30m
(100 ft)
@ 40m
dB loss
30m
(100 ft)
@10m
comment
RG-6756.9
(0.332)
1
(0.040)
AWG #18
PE0.8241.7
(0.028)
0.390.86BELDEN
8215
RG-8X506.1
(0.242)
1.5
(0.063)
AWG #14
PE foam0.8255
(0.037)
0.761.6BELDEN
9258
RG-85210.3
(0.405)
2.26
(0.089)
AWG #13
PE0.66156
(0.12)
0.501.07BELDEN 9251
RG-117510.3
(0.405)
1.2
(0.048)
PE0.66141
(0.09)
0.491.04BELDEN 8261
RG-58504.9
(0.195)
0.89
(0.036)
PE0.6637
(0.025)
1.092.4BELDEN
8259
RG-59756.1
(0.242)
0.58
(0.023)
AWG #23
PE0.6654
(0.035)
0.841.77BELDEN
8263
RG-62936.1
(0.242)
0.635
(0.023)
AWG #23
PE foam0.8451
(0.34)
0.691.44BELDEN
9862
RG-6312510.3
(0.405)
0.635
(0.023)
AWG #23
PE foam0.84126
(0.078)
0.380.81BELDEN
9857
RG-174502.8
(0.102)
0.48
(0.019)
AWG #24
PE0.6612
(0.007)
2.14.4BELDEN
8216
RG-178501.8
(0.075)
0.3
(0.012)
AWG #30
PTFE0.697.5
(0.005)
3.57.3BELDEN
83265
RG-179752.54
(0.100)
0.3
(0.012)
AWG #30
PTFE0.6915
(0.10)
2.65.3BELDEN
83264
RG-2135010.3
(0.405)
2.26
(0.089)
AWG #13
PE0.66155
(0.120)
0.501.07BELDEN
8267
RG-316502.5
(0.102)
0.51
(0.020)
AWG #24
PTFE0.6915
(0.010)
2.24.7BELDEN 83284
UR-43524.9
(0.195)
0.81
(0.032)
PE0.661.12.6similar to
RG-58
UR-577510.3
(0.405)
1.2
(0.044)
PE0.660.460.97similar to
RG-11
UR-675010.3
(0.405)
2.26
(0.087)
PE0.660.491.04similar to
RG-213
UR-70755.8
(0.228)
UR-76514.9
(0.195)
0.84
(0.033)
PE0.661.43.2similar to
RG-58
UR-90756.1
(0.242)
0.56
(0.022)
PE0.661.02.2similar to
RG-59
UR-95502.3
(0.09)
PEsimilar to
RG-174
LMR-195504.9
(0.195)
0.94
(0.037)
PE foam0.7634
(0.027)
0.931.94low loss
RG-58 type
LMR-240506.1
(0.242)
1.42
(0.056)
PE foam0.8450
(0.034)
0.631.3low loss
RG-8X type
LMR-4005010.3
(0.405)
2.74
(0.108)
PE foam0.85100
(0.068)
0.320.67low loss
RG-213 type
BELDEN
9221
752.46
(0.097)
0.3
(0.012)
PE foam0.789
(0.006)
1.94.4
BELDEN
89907
504.1
(0.160)
0.94
(0.032)
AWG #20
FEP foam0.8033
(0.022)
1.12.6“Thin Ethernet”

PARALLEL CONDUCTOR FEEDLINE DATA TABLE

typeZowidth
mm
(inch)
conductor
mm
(inch)
insulationvelocity
factor
weight
g / m
( lb / ft )
dB loss
30m
(100 ft)
@ 40m
dB loss
30m
(100 ft)
@10m
comment
Wireman
551
40023.6
(0.97)
1.0
(0.040)
AWG #18
PE0.90.260.35window line
Wireman
552
38023.6
(0.97)
1.29
(0.051)
AWG #16
PE0.920.360.41window line
Wireman
553
39523.6
(0.97)
1.0
(0.040)
AWG #18
PE0.900.220.46window line
Wireman
554
36023.6
(0.97)
1.62
(0.064)
AWG #14
PE0.930.180.31window line
300 Ohm
twinlead
(nominal)
300PE0.80.250.54twinlead
Channel Master
9354
30010.4
(0.41)
0.81
(0.032)
AWG #20
PE foam0.8130.5
(0.020)
0.250.52twinlead
Archer
15-1175
30010.4
(0.41)
1.0
(0.040)
AWG #18
PE foam0.7931.8
(0.021)
0.280.60twinlead
flat –
unmarked
3008
(0.315)
0.81
(0.032)
AWG #20
PE0.8117
(0.011)
0.330.68twinlead
Archer 15-11533008
(0.315)
0.64
(0.025)
AWG #22
PE0.7917.3
(0.012)
0.360.80twinlead
“indoor”
450 ohm open wire line47025
(1.0)
1.0
(0.040)
AWG #18
air0.9520
(0.013)
0.120.25traditional
“ladder line”
600 ohm open wire line600150
(6.0)
2.0
(0.08)
AWG #12
air0.9575
(0.050)
0.050.11traditional
“ladder line”
speaker
cable #1
13536
(0.142)
0.8
(0.032)
AWG #20
PVC0.6615
(0.010)
1.96.0
speaker
cable #2
1300.51
(0.020)
AWG #24
PVC0.662.346.6
“zip cord”1055.75
(0.226)
1.0
(0.040)
AWG #18
PVC0.6630
(0.020)
2.36.5AC power cord
CAT-5 pair1002.0
(0.079)
0.51
(0.020)
AWG #24
0.71.73.6twisted pair from
computer
network
cable
BELDEN
1533

notes

RG– types are (or were) US military standards. Some of these have variations that I haven’t attempted to capture here. Vendors may describe a product like, “RG-58 type”, meaning it is somewhat similar to the standard (for example, the same outside diameter) but not meeting some details of the specification.

UR– numbers are British standard cables

LMR– numbers are low loss foam types made by Times Microwave. Other vendors make similar low-loss cables.

Wireman types may now be discontinued, but other vendors sell products using the same 3-digit numbers. Some of these use stranded copper-clad steel wire, which will have higher losses than solid copper wire of the same size, especially at lower frequencies.

BELDEN part numbers are given for many cable types: this is for those who want more detailed information from a datasheet. The last two entries are Belden products that don’t have a corresponding RG number, but that may be useful in some situations.

Zo is the characteristic impedance of the line.

Loss values are Matched Line Loss.

Loss values in purple may be higher due to the use of copper-clad steel for the center conductor, especially if it is stranded. Generally this is more of an issue below 10 MHz or so, but with some cables the effect can be measurable throughout the HF range.

Cables with PVC insulation are not designed for RF use, and the losses can vary a lot depending on the additives used in the plastic. Generally the losses increase quickly above 5 MHz or so. The effect can be clearly seen by comparing the losses for “speaker cable #2” with “CAT-5 pair”, both of which use the same size conductors.

PE = polyethylene