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  Common Coaxial Cable Specifications   Print this Page


This web page was developed in December 2004 from one by Robert Casey WA2ISE. Mike Morris WA6ILQ found Roberts table on a now-defunt web site and happened to save a local copy. The data on this web page above the dividing line is 100% Robert's work, and presented with permission. The layout is reformatted a little to match repeater-builder's style.
Questions about cables should go to WA2ISE at the email address listed at http://www.qrz.com/.

Some manuals refer to "RG-" numbers, other to "RG" numbers (i.e. without the dash/hyphen). For consistency, we will leave it out on this page.
Common Coaxial Cables
Common
Name
Impedance
in Ohms
Loss in dB
per 100 feet
Velocity Max voltage
in RMS KV
at 50MHz at 1GHz
RG6U 75 1.5 11 dB .78 (foam) 0.6kv
RG8U 52 1.2 9 .66 (poly) 5kv
RG8U 50 1.1   .78 (foam) 0.6
RG8X 50   13.5 .84 2.5
RG9U 51 1.6   .66 " 5
RG11U 75 1.3 9 .66 (poly) 5
RG11U 75 1.0   .78 (foam) 0.6
22B/U 95   2.1 66 (poly) ?
RG55B/U 53.5   16.5   1.9kv
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
RG59U 75 2.1   .78 (foam) 0.3kv
RG62U 93 1.9 8.5 .84 (air & poly) 0.7kv
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
RG174U 50 6.6 31 .66 (poly) 1.5
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
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 .66 (poly) 7
RG218U 50   3.8 .66 (poly) 11Kv
RG219U 50   3.8   11
RG223U 50 3.1 16.5 .66 " 1.9
RG225U 50   7.5   5
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 .69 (Teflon) 1.9
RG401U 50   7.5 (semi-rigid) 3
RG402U 50   13 (semi-rigid) 2.5
RG405U 50 22   (semi-rigid) 2
8218 75   20   0.6
8281 75   9.2   2.9
9913 50   4.5   0.6
9914 50   6   0.6


Common
Name
Impedance
in Ohms
Loss in dB
per 100 feet
Velocity Max voltage
in RMS KV
at 50MHz at 1GHz
Thicknet
(old ethernet)
50 1.2   .78 (foam) 0.6
"Twin Lead" 300 0.8 and worse
when wet!
  .80 (poly) ?

The attenuation curves generally follow a straight line when drawn on log-log graph paper.   The slope is such that a coax with 2 dB at 50 MHz will be 0.8 at 10 MHz.   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 planning to 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.

73 de WA2ISE


Text and layout for the tables above is © Copyright 1997 Robert Casey WA2ISE   Contact via the email address available at http://www.qrz.com/

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The information below was collected by WA6ILQ:
See the note at the bottom regarding Heliax velocity.
Coax Style dB Loss per 100 feet
Frequency in MHz
Velocity O.D. Shield Notes
147 444 903
Andrews FSJ1-50 2.25 4 6.18   n/a 100% solid copper jacket   1/4 inch Superflex
Andrews FSJ4-50B 1.275 2.4 3.37   n/a 100% solid copper jacket   1/2 inch Superflex
Andrews LDF2-50 1.275 2.3 3.31 .88 n/a 100% solid copper jacket   3/8 inch Heliax
Andrews LDF4-50A 0.83 1.5 2.2 .88 n/a 100% solid copper jacket   1/2 inch Heliax
Andrews LDF5-50A 0.455 0.83 1.23 .88 n/a 100% solid copper jacket   7/8 inch Heliax
Andrews LDF6-50 0.34 0.615 0.91 .88 n/a 100% solid copper jacket   1-1/4 inch Heliax
Andrews LDF7-50 0.25 0.46 0.72 .88 1.98 100% solid copper jacket   1-5/8 inch Heliax
Times Microwave LMR-200 4 7 10   0.195 100% Not recommended for duplex use
Times Microwave LMR-400 1.5 2.7 3.9 .85 0.425 100% Not recommended for duplex use
Times Microwave LMR-600 1 1.7 2.5 .85 0.59 100% Not recommended for duplex use
Times Microwave LMR-900 0.7 1.2 1.7   0.875 100% Not recommended for duplex use
Times Microwave LMR-1200 0.5 0.9 11.3   1.25 100% Not recommended for duplex use
Belden 8214 (RG8/U type) 2.25 4.5 6.7   0.403 97% n/a
Belden 8216 (RG174/U type) 10.5 20.5 31   0.101 90% n/a
Belden 8240 (RG58/U type) 5.65 10.7 16   0.193 95% n/a
Belden 8259 (RG58A/U type) 6.1 12.5 20   0.193 95% n/a
Belden 8267 (RG213/U type) 2.35 4.6 7.6   0.405 97% n/a
Belden 8268 (RG214/U type) 2.35 5.1 7.7   0.425 97% double silver shield
Belden 9258 (RG8/X type) 4.55 8.5 12.8   0.242 95% n/a
Belden 9273 (RG223/U type) 5 9.4 13.8   0.212 95% double silver shield
Belden 9913 (RG8 type) 1.55 2.9 4.2   0.405 100% Braid shield over foil shield, not recommended for duplex use
Belden 9914 (RG8/U type) 2 3 5.7   0.403 100% braid shield over foil shield
Belden 84142 (RG142 type) 4.75 8.8 12.5   0.195 98% brown FEP jacket - double silver shield
The table above gives 0.88 as the velocity for all LDF series cables. I have seen one book that mentions only 1/2 inch and 7/8 inch and gives 0.81 for a velocity factor. Not havaing the equipment to measure it myself I have no idea as to which is correct.

Most of us don't think of it, but the outer jacket of most feedline cabling is flammable, and this factor can influence how you run the cabling and what cable you chose to run - some types are available with a teflon outer jacket, many are not.   Many cable jacket materials give off toxic fumes while burning.

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Hand-coded HTML © Copyright 2005 and date of last update by Mike Morris WA6ILQ
Original page created 01-Dec-2004 by WA6ILQ from WA2ISE's saved page layout.
Page updated - added the lower table 12-2006 by WA6ILQ

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.