Quick Reference
RFC240 ULTRA FLEX Coaxial Cable
50 Ohm • DC – 6 GHz
RFC-240-UltraFlex is the flexible version of RFC-240, combining low-loss 0.240" performance with improved bendability for easier installation. Ideal for mobile radio setups, vehicle antenna mounts, and congested equipment areas where a rigid cable would be impractical.
RFC240 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 | 2.6 dB | 0.026 dB | 0.16 dB | 0.65 dB | 1.3 dB | 2.6 dB |
| 450 MHz | 5.6 dB | 0.056 dB | 0.34 dB | 1.4 dB | 2.8 dB | 5.6 dB |
| 900 MHz | 8.1 dB | 0.081 dB | 0.49 dB | 2.03 dB | 4.05 dB | 8.1 dB |
| 1.8 GHz | 11.7 dB | 0.117 dB | 0.7 dB | 2.93 dB | 5.85 dB | 11.7 dB |
| 2.4 GHz | 13.6 dB | 0.136 dB | 0.82 dB | 3.4 dB | 6.8 dB | 13.6 dB |
| 5.8 GHz | 22.5 dB | 0.225 dB | 1.35 dB | 5.63 dB | 11.25 dB | 22.5 dB |
RFC240 ULTRA FLEX Power Handling
Approximate maximum continuous power (CW) at 25°C ambient.
| Frequency | Max Power (W) |
|---|---|
| 100 MHz | 180 W |
| 450 MHz | 80 W |
| 900 MHz | 52 W |
| 1.8 GHz | 35 W |
| 2.4 GHz | 29 W |
| 5.8 GHz | 16 W |
Construction & Materials
Center Conductor
Stranded bare copper, 1.42mm
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 RFC240 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 $12.99
SMA FEMALE to SMA MALE
From $12.99
RP-SMA MALE to SMA MALE
From $12.99
RP-SMA FEMALE to SMA MALE
From $12.99
N MALE to SMA MALE
From $13.49
N FEMALE to SMA MALE
From $13.49
BNC MALE to SMA MALE
From $13.99
RP-TNC MALE to SMA MALE
From $12.99
SMA MALE to TNC MALE
From $12.99
PL259 UHF Male to SMA MALE
From $14.99
SMA MALE to SO239 UHF Female
From $14.99
SMA FEMALE to SMA FEMALE
From $12.99
RP-SMA MALE to SMA FEMALE
From $12.99
RP-SMA FEMALE to SMA FEMALE
From $12.99
N MALE to SMA FEMALE
From $13.49
N FEMALE to SMA FEMALE
From $13.49
BNC MALE to SMA FEMALE
From $13.99
RP-TNC MALE to SMA FEMALE
From $12.99
48 more configurations available on the RFC240 ULTRA FLEX page.
Frequently Asked Questions
What is the impedance of RFC240 ULTRA FLEX?
RFC240 ULTRA FLEX is a 50 Ohm coaxial cable. All standard RF systems (antennas, transceivers, test equipment) use 50-ohm impedance, so RFC240 ULTRA FLEX connects directly without any matching network.
What frequency range does RFC240 ULTRA FLEX support?
RFC240 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 RFC240 ULTRA FLEX have?
RFC240 ULTRA FLEX has 2.6 dB of attenuation per 100 ft at 100 MHz, rising to 22.5 dB per 100 ft at 5.8 GHz. Use the attenuation table above to calculate loss for any specific length and frequency.
Are CoaxRF RFC240 ULTRA FLEX cable assemblies made in the USA?
Yes. Every RFC240 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 RFC240 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.