Quick Reference
RFC400 ULTRA FLEX Coaxial Cable
50 Ohm • DC – 6 GHz
RFC-400-UltraFlex combines the low-loss performance of 0.400" coax with the flexibility needed for complex routing, offering an economical option for installations that benefit from increased bendability. Suitable for rooftop antenna runs, equipment room patch cables, and mobile installs where budget and flexibility are both priorities.
RFC400 ULTRA FLEX 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 | 1.6 dB | 0.016 dB | 0.1 dB | 0.4 dB | 0.8 dB | 1.6 dB |
| 450 MHz | 3.5 dB | 0.035 dB | 0.21 dB | 0.88 dB | 1.75 dB | 3.5 dB |
| 900 MHz | 5 dB | 0.05 dB | 0.3 dB | 1.25 dB | 2.5 dB | 5 dB |
| 1.8 GHz | 7.2 dB | 0.072 dB | 0.43 dB | 1.8 dB | 3.6 dB | 7.2 dB |
| 2.4 GHz | 8.4 dB | 0.084 dB | 0.5 dB | 2.1 dB | 4.2 dB | 8.4 dB |
| 5.8 GHz | 13.8 dB | 0.138 dB | 0.83 dB | 3.45 dB | 6.9 dB | 13.8 dB |
RFC400 ULTRA FLEX Power Handling
Approximate maximum continuous power (CW) at 25°C ambient.
| Frequency | Max Power (W) |
|---|---|
| 100 MHz | 460 W |
| 450 MHz | 200 W |
| 900 MHz | 135 W |
| 1.8 GHz | 92 W |
| 2.4 GHz | 78 W |
| 5.8 GHz | 45 W |
Construction & Materials
Center Conductor
Stranded bare copper, 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
PVC
The outer jacket protects the cable from physical damage, UV, chemicals, and moisture. PTFE and FEP jackets handle higher temperatures than PVC.
Velocity Factor
83% (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 ULTRA FLEX 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 $22.38
SMA FEMALE to SMA MALE
From $22.38
RP-SMA MALE to SMA MALE
From $22.38
RP-SMA FEMALE to SMA MALE
From $22.38
N MALE to SMA MALE
From $22.88
N FEMALE to SMA MALE
From $22.88
N MALE ANGLE to SMA MALE
From $23.38
BNC MALE to SMA MALE
From $23.38
RP-TNC MALE to SMA MALE
From $22.38
RP-TNC FEMALE to SMA MALE
From $22.38
SMA MALE to TNC MALE
From $22.38
PL259 UHF Male to SMA MALE
From $24.38
SMA MALE to SO239 UHF Female
From $24.38
SMA MALE to TNC FEMALE
From $22.38
SMA MALE to UHF Male Angle
From $22.88
DIN 7/16 MALE to SMA MALE
From $26.37
SMA FEMALE to SMA FEMALE
From $22.38
RP-SMA MALE to SMA FEMALE
From $22.38
118 more configurations available on the RFC400 ULTRA FLEX page.
Frequently Asked Questions
What is the impedance of RFC400 ULTRA FLEX?
RFC400 ULTRA FLEX is a 50 Ohm coaxial cable. All standard RF systems (antennas, transceivers, test equipment) use 50-ohm impedance, so RFC400 ULTRA FLEX connects directly without any matching network.
What frequency range does RFC400 ULTRA FLEX support?
RFC400 ULTRA FLEX 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 ULTRA FLEX have?
RFC400 ULTRA FLEX has 1.6 dB of attenuation per 100 ft at 100 MHz, rising to 13.8 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 ULTRA FLEX cable assemblies made in the USA?
Yes. Every RFC400 ULTRA FLEX 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 ULTRA FLEX?
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.