RG6, 58,59 Cable Data

RG6, 58,59 Cable Data

Post by Chris Farre » Tue, 12 Mar 1996 04:00:00


I do not read or subscribe to this group.
I think the information may be benificial.

The following information was extracted from the Times Fiber Communications,
table on RG cables. There are some columns that I chose not to include such
as jacket material and max operating temperature range.  If you have a
specific
RG numbered cable that is not common I have that information and may be able
to provide at a future date.

RG6
inner conductor                 0.0285"
Type of Shielding braids        2 inner SC Outer BC
Outside Dia.                    0.332
Weight          lbs/ft          0.081
Nominal Imped.  ohms            76.0
Nominal Capacitance pf/ft       20.0
Max Oper Volts  VRMS            2,700
DB/100ft        10MHz           .80
Nominal loss    50MHz           1.40
                100Mhz          2.90
                200Mhz          4.30
                400MHz          6.40
                1000MHz         11.00
                3000MHz         22.00
                5000MHz         30.00
                10000Mhz        52.00

Maximum power   10Mhz           2000
handling cap.   50MHz           800
in watts        100Mhz          550
                200Mhz          350
                400Mhz          230
                1000MHz         125
                3000Mhz         60
                5000Mhz         40
                10000Mhz        22

RG6A is the same as above except:
Nominal Imped.  ohms            75.0
Nominal Capacitance pf/ft       20.6

RG58A
Inner Conductor                 0.0355"
Type of Shielding braids        1 TC
Outside Dia.                    0.195
Weight          lbs/ft          0.029
Nominal Imped.  ohms            52.0
Nominal Capacitance pf/ft       28.5
Max oper Voltage VRMS           1,900

RG58B is the same as above except
Inner Conductor                 0.0320"
Nominal Imped                   53.5
Nominal Capacitance             28.5
DB/100ft        10MHz           1.20
Nominal loss    50MHz           3.10
                100Mhz          4.60
                200Mhz          7.00
                400MHz          10.00
                1000MHz         17.50
                3000MHz         38.00
                5000MHz         -----
                10000Mhz        -----

Maximum power   10Mhz           730
handling cap.   50MHz           280
in watts        100Mhz          180
                200Mhz          125
                400Mhz          85
                1000MHz         50
                3000Mhz         25
                5000Mhz         17
                10000Mhz        ----

RG58C is the same as RG58A. The following apply to both types.
Inner Conductor                 0.0355
Nominal Imped                   50.0
Nominal capacitance             30.8
DB/100ft        10MHz           1.40
Nominal loss    50MHz           3.30
                100Mhz          4.90
                200Mhz          7.30
                400MHz          11.00
                1000MHz         20.00
                3000MHz         41.00
                5000MHz         ----
                10000Mhz        ----

Maximum power   10Mhz           650
handling cap.   50MHz           255
in watts        100Mhz          170
                200Mhz          110
                400Mhz          75
                1000MHz         44
                3000Mhz         22
                5000Mhz         15
                10000Mhz        ----
RG59A
Inner Conductor                 0.0253"
Type of Shielding braids        1 BC
Outside Dia.                    0.242
Weight  lbs/ft                  0.032
Nominal imped.  ohms            73.0
Nominal capacitance pf/ft       21.0
Max Oper Voltage VRMS           2,300

RG59B is the same as above except
Inner conductor                 0.0230"
Nominal Impedence               75.0
Capacitance pf/ft               20.6
RG59, A, B.
DB/100ft        10MHz           1.10
Nominal loss    50MHz           2.30
                100Mhz          3.30
                200Mhz          4.70
                400MHz          6.70
                1000MHz         11.50
                3000MHz         25.50
                5000MHz         41.00
                10000Mhz        -----

Maximum power   10Mhz           1300
handling cap.   50MHz           480
in watts        100Mhz          310
                200Mhz          200
                400Mhz          135
                1000MHz         77
                3000Mhz         40
                5000Mhz         27
                10000Mhz        15

Dielectric Material for all the above cables is Polyethylene

I have typed in the information above as it appeared in the tables I have.
I can not verify if the numbers given to me are correct nor do I have the
time to do so.  I have verified that I have not transposed any of the
numbers.

The best Cable in my opinion for standard cost is the double shielded
RG223 for the smaller diameter or RG214 for the Larger diameter cable.
And their belden equivalents.

However, if I had my choice and money was no object then I'd probably be
using some
very low loss heliax cable

Then again we use waveguide WR2100 and 6 1/8" for TX/RX at work Very low
loss.
Work www site http://hyperion.haystack.edu

I hope the information is usefull and people will keep it on file for future
reference.

Chris

 
 
 

RG6, 58,59 Cable Data

Post by Robert Everitt Hei » Thu, 14 Mar 1996 04:00:00




>The following information was extracted from the Times Fiber Communications,
[...]
>Dielectric Material for all the above cables is Polyethylene

Solid PE dielectric in RG6 and RG59, that's interesting.  All the
suppliers around here sell foam dielectric RG6 and RG59.  I have noticed
both solid and foam cable labeled RG8, both foam and semi-solid RG62 as
well.  Buyer beware.

I started to notice the dielectrics after learning to use Q sections and
stubs for antenna matching, where velocity factor is important.  The
Times coax you described has VF=.66 which is typical of solid PE.  Here is
the formula I used to determine VF from impedance Z ohms and capacitance
C pf/ft:  VF=1016/(Z*C)

The dielectric also determines the center conductor size for the desired
impedance.  The center conductor for foam is larger than for solid PE,
and since most of the loss is due to skin resistance of the center
conductor, foam-type coax should have lower loss than solid PE.

Power and peak voltage handling is generally much higher with solid
dielectric than with foam.  The cost-effective RG8X and RG59 foam types,
which aren't rated to handle a kilowatt plus, are never recommended by
ham authorities.  

The mechanical properties of the dielectric could also be important.
Foam coax is lighter than it looks, an advantage for portable stations.
Solid PE dielectric is more resistant to abuse such as soldering heat,
stepping on it, or tightly coiling it into a choke.

Coax is so simple -- only four parts, and we just discussed one -- okay,
off the soapbox for now.  

73, Rob  KO6KA

P.S.  Food for thought: golf balls have dimples; hardline is corrugated.