LMR 195 LMR195 coaxial RF Cable

dimension of LMR-195 coaxial
cable

Structure
Structure of a coaxial cable, coax in short, from inside out: core wire, dielectric insulator, 1 or several layers of metallic boil, mesh or braid, outer sheath or jacket. The top figure shows the dimension of a typical coax.

One layer of braid can block 95% of external interference with an approximate shielding effectiveness of -55 dB. The left 5% can be blocked by adding extra layers of foil with an approximate shielding effectiveness of -90 dB.

Commonly used coax
RG, Radio Guide coax. Old military standard. Commonly used ones:

RG-59, RG-6, RG-11 from low end to high end uses, impedance: 75 Ohm, outer diameter: 6.1, 6.86, 10.5 mm, respectively. Used with F connectors for TV
RG-58, RG-142 from low end to high end uses, impedance: 50 Ohm, outer diameter: 5, 4.95 mm, respectively
RG-316/U, RG-174, impedance: 50 Ohm, outer diameter: 2.6 mm, single shield, used with LEMO 00 connector
LMR, nobody knows what it stands for. Made by Times Microwave Systems. Low loss coax, 50 Ohm.

LMR-100A, outer diameter: 2.79 mm, replace RG-316/RG-174
LMR-195, outer diameter: 4.95 mm (0.195 inch), replace RG-58, RG-142
Connectors
LEMO 00, Leon Mouttet connector. Miniature push-pull 50 Ohm coaxial connector. Replacement of BNC in high density design, front panel connectors for NIM & CAMAC modules. Diameter: ~ 5 mm.

BNC, Bayonet Neill Concelman connector. Diameter: 14.5 mm (Male), 11.1 mm (Female). Passband: 0-4 GHz. Impedance: 75 or 50 Ohm. The 75 Ohm types can sometimes be recognized by the reduced or absent dielectric in the mating ends.

SHV, Safe High Voltage (>500V) connector. Up to 5 kV DC, 5 A. 20 kV version also available.

MHV, Miniature High Voltage (>500V) connector. Up to 5 kV DC, 3 A. Easily mistaken as BNC.

MCX, Micro CoaX connector. Diameter: 3.6 mm. Passband: 0-6 GHz. Impedance: 75 or 50 Ohm. Gold plated. Snap-on interface.

SMA, Sub-Miniature version A. Diameter: 7.9 mm. Passband: 0-18 GHz.
Impedance: 50 Ohm. Screw coupling.

F connector, for TV. Cheap because core wire of cable is used as pin of male connector. Diameter: 11 mm. Passband: 0-1 GHz, Impedance: 75 Ohm.