How do you calculate velocity factor?
The velocity is simply the velocity factor times the speed of light in a vacuum v=(VF)c≈(VF)(3×108m/s) v = ( V F ) c ≈ ( V F ) ( 3 × 10 8 m / s ) If a communication cable is two conventional conductors (copper, aluminium), separated by commonly available insulation (polyethylene, nylon, air), and the cable does not …
What is coax velocity factor?
Coaxial cable specifications often include the velocity factor, which is typically between 60% and 90% (1). A cable with a velocity factor of 70% means that the signal travels at 0.7 times the speed of light or 2.1 ∙ 10^8 m/sec. The velocity factor is directly related to the permittivity of the transmission line.
What is the velocity factor of RG58 coax?
Cable Velocity Factor and Loss Data (per 100 feet)
| TYPE | VF | LOSS @ 10 MHz |
|---|---|---|
| RG-58/U PE (Belden 9201) | 66.0 | 1.1 |
| RG-58A/U Foam (Belden 8219) | 73.0 | 1.3 |
| RG-59A/U PE (Belden 8241) | 66.0 | 1.1 |
| RG-59A/U Foam (Belden 8241F) | 78.0 | 0.9 |
What is the velocity factor of RG8X?
0.79
The velocity factor for RG8X is 0.79. 9914 cable has a velocity factor of 0.78, and 9913 cable has a velocity factor of 0.84 . Velocity factor is used to determine the length of cable to be used for a specific wavelength, such as 1/2 wavelength.
What is the velocity factor of copper?
The VF for most common insulating materials is between 0.95 – 0.98 (PVC, Polyethylene, Teflon) so be sure to take that into account as well….Velocity Factor.
| Frequency | ½ λ in free space | ½ λ in bare copper wire |
|---|---|---|
| 868MHz | 17.3cm | 17.3 x 0.95 = 16.4cm |
| 915MHz | 16.4cm | 16.4 x 0.95 = 15.6cm |
Does coax length affect SWR?
The ONLY issue coax length has in a basic system is the longer it is the more loss you have. In fact because SWR is a measurement of reflected power and if you measure at the transmitter output your SWR can look better because there’s more cable loss than if it were shorter.
What affects velocity factor?
In electrical cables, the velocity factor mainly depends on the insulating material (see table below). The use of the terms velocity of propagation and wave propagation speed to mean a ratio of speeds is confined to the computer networking and cable industries.
What is gear velocity factor?
The ratio of the static load at the failure to the dynamic load at failure was taken as the Velocity factor (Kv). This means that an identical gear pair running at this speed would have a dynamic load equal to Kv times the static tangential load.
What is the difference between RG-58 and rg58u?
RG-58/U and RG-58A/U are the same cable, the only difference is in the centre conductor. RG-58/U has a solid core and RG-58 A/U has a stranded core.
What is the difference between RG-58 and RG174?
RG58 and RG174 cables are used in vehicle boosters. The difference between the two is the better low-loss quality of the RG58 with cable length up to 20 feet compared to the RG174’s 6 feet. For large vehicles, such as RVs or boats, the RG174 is preferred. Both are fitted with SMA connectors.
What is the velocity factor of rg6 coax?
83 percent
DX Engineering RG-6/U cable impedance is 75 ohms with an 83 percent velocity factor and have a minimum bend radius of 2.50 in.
What is the difference between RG-58 and LMR 200?
This flexible cable is similar in size with RG-58 cable, but provides better specs. LMR 200 coax cable has an attenuation at 1 GHz of 10.5 dB, RF shielding of 90 dB and the max frequency of 5.8 GHz.
What is the difference between LMR and RG cables?
LMR cables surpassed the aging RG cables in flexibility, installations, RF shielding and low loss performance. LMR RF coax cables are used in any demanding RF applications for high performance. LMR cables are available in a full range of sizes from 0.100 inch (LMR-100) to 1.70 inches (LMR-1700).
What is LMR RF coax cable?
LMR RF coax cables are used in any demanding RF applications for high performance. LMR cables are available in a full range of sizes from 0.100 inch (LMR-100) to 1.70 inches (LMR-1700). The LMR cable numbers are as follows: LMR-100A; LMR-195; LMR-200; LMR-240; LMR-300; LMR-400; LMR-600; LMR-900; LMR-1200; & LMR-1700
What are the characteristics of the LMR 200?
LMR 200 features solid bare copper center conductor and braid with foil outer conductor. LMR Cables are the latest advent in the RF Coax cables.