Loss is a length multiplier, so a 200 ft length would have twice the loss shown above and a 50 ft length would have half the loss. This multiplier factor is why you should keep cable installation lengths between radios and antennas as short as practical!

9913 and LMR-400 are popular “low-loss” RG-8 types. Suitable for VHF (~1.5dB loss per 100 feet at 146 MHz). The flexible types (9913F and LMR-400UF) are preferred, particularly for rotatable antennas. However, stranded center conductors have a little higher loss than solid ones.

Properties for popular coaxial cables are listed below including Type, Z0, Dielectric, Capacitance, dB.

DXE-400MAX Low-Loss Cable DXE-8U Low-Loss Foam Dielectric Cable DXE-8X Low-Loss Foam Dielectric Cable (also known as RG-8X or Mini-8) DXE-213U 50 ohm Cable DXE-58AU 50 ohm Cable DXE-RG400 50 ohm High Isolation - High Power DXE-11U 75 ohm Low Loss Cable DXE-214 50 ohm Cable 19 strands - 20 AWG center conductor

The following charts measure the attenuation (loss) of different types of coax at 50 and 100 foot lengths for each of the amateur radio bands. Attenuation is measured in dB.

Online Coax Cable Loss / Antenna Gain Calculator. Enter dB Loss Of Cable Per 100 Ft. At The Desired Operating Frequency. This program is provided "as-is". It is thought to be accurate but it is the responsibility of the user to verify the accuracy of the calculations when using this program.

Attenuation (dB per 100 feet): MHz: 30: 50: 100: 146: 150: 440: 450: 1000: 2400 #2632: RG-174: 5.5: 6.6: 8.8: 13.0 : 25.0 : 30.0: 75.0 #0985: LMR-100A® 3.9: 5.1 : 8. ...

The tables below should help you decide what if any coax changes you need to make. Color Key: Green shade 50 - 52 ohm Coax dB Loss per 100 Feet using common coax types:

Calculate the attenuation and power handling capability of coaxial cables using the online calculator by Times Microwave Systems. Choose from a variety of cables and get started now!

- 3dB loss means 50% (half) the signal is lost. - 6dB loss means 75% of the signal is lost. - 10dB loss means 90% of the signal is lost.