Quick Reference
LMR400 Times Coaxial Cable
50 Ohm • DC – 6 GHz
LMR-400 is the industry-standard low-loss 50-ohm coaxial cable from Times Microwave with a 0.400" outer diameter, offering less than half the signal loss of RG-8 at 2.4 GHz. The go-to cable for base station feedlines, cellular repeater installations, antenna runs from 50 to 200 feet, and any fixed installation requiring reliable broadband performance.
LMR400 Times Attenuation
Signal loss in dB per 100 ft at standard RF frequencies.
| Frequency | Loss / 100 ft | Loss / ft | 6 ft | 25 ft | 50 ft | 100 ft |
|---|---|---|---|---|---|---|
| 100 MHz | 1.5 dB | 0.015 dB | 0.09 dB | 0.38 dB | 0.75 dB | 1.5 dB |
| 450 MHz | 3.3 dB | 0.033 dB | 0.2 dB | 0.83 dB | 1.65 dB | 3.3 dB |
| 900 MHz | 4.7 dB | 0.047 dB | 0.28 dB | 1.18 dB | 2.35 dB | 4.7 dB |
| 1.8 GHz | 6.8 dB | 0.068 dB | 0.41 dB | 1.7 dB | 3.4 dB | 6.8 dB |
| 2.4 GHz | 7.9 dB | 0.079 dB | 0.47 dB | 1.98 dB | 3.95 dB | 7.9 dB |
| 5.8 GHz | 13 dB | 0.13 dB | 0.78 dB | 3.25 dB | 6.5 dB | 13 dB |
LMR400 Times Power Handling
Approximate maximum continuous power (CW) at 25°C ambient.
| Frequency | Max Power (W) |
|---|---|
| 100 MHz | 500 W |
| 450 MHz | 220 W |
| 900 MHz | 150 W |
| 1.8 GHz | 100 W |
| 2.4 GHz | 85 W |
| 5.8 GHz | 50 W |
Construction & Materials
Center Conductor
Bare copper clad aluminum, 2.74mm
The center conductor carries the RF signal. Material and diameter affect DC resistance, skin effect losses, and overall attenuation.
Dielectric
Foamed PE
The dielectric insulator separates the center conductor from the shield. PTFE dielectrics offer superior temperature stability and lower loss versus polyethylene.
Shield
Aluminum foil + tinned copper braid
The outer conductor provides the return path and shields the signal from external interference. More braid coverage means better EMI rejection.
Jacket
PE
The outer jacket protects the cable from physical damage, UV, chemicals, and moisture. PTFE and FEP jackets handle higher temperatures than PVC.
Velocity Factor
85% (c)
How fast the signal travels relative to the speed of light in vacuum. Higher velocity factor means shorter electrical wavelength per foot — important for phased array and delay-matched applications.
Max Voltage
600 VRMS
The maximum continuous operating voltage. Exceeding this can cause dielectric breakdown. Relevant for high-power transmitters and pulse applications.
Available LMR400 Times Assemblies
Choose a connector combination to see pricing and order. All assemblies are hand-built and ship free within the USA.
SMA MALE to SMA MALE
From $19.50
SMA FEMALE to SMA MALE
From $19.50
RP-SMA MALE to SMA MALE
From $19.50
RP-SMA FEMALE to SMA MALE
From $19.50
N MALE to SMA MALE
From $20.00
N FEMALE to SMA MALE
From $20.00
BNC MALE to SMA MALE
From $20.50
RP-TNC MALE to SMA MALE
From $19.50
RP-TNC FEMALE to SMA MALE
From $19.50
SMA MALE to TNC MALE
From $19.50
PL259 UHF Male to SMA MALE
From $21.50
SMA MALE to SO239 UHF Female
From $21.50
SMA MALE to TNC FEMALE
From $19.50
SMA FEMALE to SMA FEMALE
From $19.50
RP-SMA MALE to SMA FEMALE
From $19.50
RP-SMA FEMALE to SMA FEMALE
From $19.50
N MALE to SMA FEMALE
From $20.00
N FEMALE to SMA FEMALE
From $20.00
73 more configurations available on the LMR400 Times page.
Frequently Asked Questions
What is the impedance of LMR400 Times?
LMR400 Times is a 50 Ohm coaxial cable. All standard RF systems (antennas, transceivers, test equipment) use 50-ohm impedance, so LMR400 Times connects directly without any matching network.
What frequency range does LMR400 Times support?
LMR400 Times is rated DC – 6 GHz. At higher frequencies, the attenuation per foot increases, so actual usable range depends on acceptable signal loss for your application.
How much signal loss does LMR400 Times have?
LMR400 Times has 1.5 dB of attenuation per 100 ft at 100 MHz, rising to 13 dB per 100 ft at 5.8 GHz. Use the attenuation table above to calculate loss for any specific length and frequency.
Are CoaxRF LMR400 Times cable assemblies made in the USA?
Yes. Every LMR400 Times assembly is hand-terminated and continuity tested at our US facility. We build each cable to order — nothing is pre-made or drop-shipped from overseas.
Can I order a custom length of LMR400 Times?
Yes. In addition to our standard lengths (1, 6, 25, 50, 100 ft and longer), we accept custom-length orders through the Cable Builder. Custom assemblies ship within 1–2 business days.