Quick Reference
RFC400 Coaxial Cable
50 Ohm • DC – 6 GHz
RFC-400 is a cost-effective 0.400" 50-ohm low-loss coaxial cable serving as a value-oriented alternative to LMR-400. It delivers strong performance on runs from 50 to 200 feet and is popular for cellular repeater trunk cables, outdoor antenna feedlines, and budget-conscious infrastructure deployments.
RFC400 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 |
RFC400 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 RFC400 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 $13.99
SMA FEMALE to SMA MALE
From $13.99
RP-SMA MALE to SMA MALE
From $13.99
RP-SMA FEMALE to SMA MALE
From $13.99
N MALE to SMA MALE
From $14.49
N FEMALE to SMA MALE
From $14.49
BNC MALE to SMA MALE
From $14.99
RP-TNC MALE to SMA MALE
From $13.99
RP-TNC FEMALE to SMA MALE
From $13.99
SMA MALE to TNC MALE
From $13.99
PL259 UHF Male to SMA MALE
From $15.99
SMA MALE to SO239 UHF Female
From $15.99
SMA MALE to TNC FEMALE
From $13.99
SMA FEMALE to SMA FEMALE
From $13.99
RP-SMA MALE to SMA FEMALE
From $13.99
RP-SMA FEMALE to SMA FEMALE
From $13.99
N MALE to SMA FEMALE
From $14.49
N FEMALE to SMA FEMALE
From $14.49
73 more configurations available on the RFC400 page.
Frequently Asked Questions
What is the impedance of RFC400?
RFC400 is a 50 Ohm coaxial cable. All standard RF systems (antennas, transceivers, test equipment) use 50-ohm impedance, so RFC400 connects directly without any matching network.
What frequency range does RFC400 support?
RFC400 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 RFC400 have?
RFC400 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 RFC400 cable assemblies made in the USA?
Yes. Every RFC400 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 RFC400?
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.