| Coaxial cables are the cables meant for radio frequency and have two conductors in the same axis hence called coaxial cables. The inner conductor |
| Construction :- |
| Inner Conductor – The conductor consists of solid or multi strand copper wires. This fine strands are twisted to form the joint free conductor. Depending on the specifications the form of conductor is varied i.e. |
- Plain copper conductor
- Tinned copper conductor
- Silver plated copper conductor
- Copper coated steel wires
|
The above conductors are provided in accordance to the resistivity, tensile strength, conductivity etc. |
| |
| Di-electric :- |
| The specified conductor is insulated with insulation material having no air bubbles or no air films and should exactly maintained the centre of the conductor. Generally applied insulation material are … |
- Solid polythene
- Semi Solid or Foamed polythene
- Synthetic Rubber
- PTFE
|
| |
| Outer Conductor :- |
| The conductor laid in common axis with central conductor is called the shield which is provided by way of lapping or cross braiding. The shield should not have any break in less than 300 mm. The outer conductor consists of the following material as per the design specifications. |
- Annealed bare copper.
- Annealed Tinned Copper.
- Silver Platted Copper.
|
| |
| Outer Sheath :- |
| Outer cover is such product is provided by general sheathing grade PVC compound as per IS 5831 OR synthetic rubber or PTFE wrapping to provide a uniform cover. In case of PTFE the overlap should not be less than 125%. The other kinds of sheathing materials is also specified depending on the specifications. |
| |
| Quality Check :- |
A series of tests are conducted to make a perfect cable and to provide the exact results
on the advance electronic tests instrument. |
- Conductivity tests.
- Insulation resistance.
- Velocity of propagation.
- Capacitance
- Corona Tests …etc.
|
| |
| Radio Frequency Coaxial Cables |
| Item |
Conductor Size mm |
Dia over Dielectric (mm) |
O.D. (mm) |
Impedance (ohms) |
Attenuation at 200 MHz (db/100 m) |
Max R.F. Operating voltage (kv) |
|
| Characteristic impedance 50-55 ohms |
RG-55B/U |
0.81 (S) |
2.95 |
5.2 |
53.5 |
20 |
1.9 rms |
RG-58 C/U |
19/0.18 (T) |
2.95 |
5.0 |
50 |
24 |
1.9 rms |
RG-58/U |
0.81 (P) |
2.95 |
5.0 |
53.5 |
23 |
1.9 rms |
RG-174/U |
7/0.16 (C) |
1.50 |
2.5 |
50 |
40 |
1.5 rms |
RG-212/U |
1.2(S) |
4.70 |
8.4 |
50 |
14 |
3.0 rms |
| RG-213/U |
Similar to and substitutes URM-67 and UR-67 |
| . |
7/0.75 (S) |
7.25 |
10.8 |
50 |
11 |
5.0 rms |
RG-217/U |
2.7 (P) |
9.8 |
13.8 |
50 |
7 |
7.0 rms |
| RG-218/U |
Similar to and substitutes URM-74 and UR-74 |
| |
4.95 (P) |
17.3 |
22.1 |
50 |
4 |
11.0 rms |
|
|
|
|
|
|
|
| URM-115 |
0.9(P) |
2.95 |
7.2 |
50 |
19 |
2.0 peak |
| URM-43 |
0.9 (P) |
2.95 |
5.0 |
50 |
19 |
2.6 peak |
| URM-76 |
7/0.32 (P) |
2.95 |
5.0 |
50 |
22 |
2.6 peak |
| URM-91 |
7/0.76 (P) |
7.25 |
11.0 |
5 |
10 |
6.5 peak |
|
|
|
|
|
|
|
| Characteristic Impedance 70-75 ohms |
| RG-11 A/U |
7/0.41 (P) |
7.25 |
10.3 |
75 |
11 |
5.0 rms |
| RG-216/U |
7/0.41 (T) |
7.25 |
10.8 |
75 |
15 |
5.0 rms |
| RG-34B/U |
7/0.64(P) |
11.70 |
16.0 |
75 |
7 |
6.5 rms |
| RG-59/U |
0.63 (P) |
3.70 |
6.2 |
73 |
16 |
2.3 rms |
| RG-59B/U |
0.58 (C) |
3.70 |
6.1 |
75 |
16 |
2.3 rms |
| UR-21 |
1.42 (P) |
8.40 |
11.5 |
71 |
8 |
5.0 peak |
| UR-54 |
7/0.193(P) |
3.25 |
8.3 |
72 |
22 |
1.8 peak |
| UR-56 |
0.56 (P) |
3.25 |
5.9 |
71 |
18 |
2.5 peak |
| UR-59 |
1.12(P) |
7.25 |
10.3 |
75 |
9 |
5.0 peak |
| UR-60 |
1.12 (P) |
7.25 |
11.7 |
75 |
9 |
5.0 peak |
| URM-117 |
7/0.212 (P) |
3.70 |
6.0 |
75 |
18 |
2.6 peak |
| URM-200 |
7/0.2(P) |
2.45 |
4.1 |
75 |
23 |
Foam-PE
dielectric |
| URM-201 |
0.71 (P) |
3.25 |
5.1 |
75 |
16 |
-do- |
| URM-202 |
7/0.25 (P) |
3.25 |
5.1 |
75 |
16 |
-do- |
| URM-203 |
1.12 (P) |
5.10 |
7.3 |
75 |
11 |
Foam-PE
dielectric |
| URM-204 |
1.25 (P) |
5.60 |
7.8 |
75 |
10 |
-do- |
| URM-206 |
1.4 (P) |
6.35 |
8.7 |
75 |
8 |
Foam-PE
dielectric |
| URM-210 |
7/0.19 (P) |
3.25 |
5.8 |
75 |
22 |
-do- |
| URM-65 |
1.15(P) |
7.25 |
10.3 |
75 |
9 |
5.0 rms |
| URM-70 |
7/0.19 (P) |
3.25 |
5.8 |
75 |
22 |
1.8 peak |
| Similar to and substitutes RG-164/U |
|
|
|
|
| Characteristic impedance 90-125 ohms |
| RG-22/U |
2x7/0.38(P) |
7.25 |
10.3 |
95 |
20 |
1.00 rms |
RG-57A/u
Twin conductor |
2x7/0.12 |
12.0 |
15.9 |
95 |
12 |
3.0 rms |
| RG-62A/u |
0.64 (C) |
3.7 |
6.1 |
93 |
12 |
0.75 rms |
| RG-63 B/u |
0.64 (P) |
7.25 |
10.3 |
125 |
9 |
1.00 rms |
| RG-71B/U |
0.64(P) |
3.7 |
6.4 |
93 |
12 |
0.75 rms |
| UR-78 |
0.61 (P) |
7.25 |
10.3 |
100 |
11 |
3.7 rms |
|
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