Quick Reference
RG402 Coaxial Cable
50 Ohm • DC – 20 GHz
RG-402 (UT-141) is a 0.141" semi-rigid coaxial cable with a solid copper outer conductor that holds its shape once formed. Its low loss and excellent phase stability make it the standard interconnect in microwave test setups, network analyzers, and laboratory bench assemblies. Ideal wherever cable position is fixed and mechanical rigidity is advantageous.
RG402 Attenuation
Signal loss in dB per 100 ft at standard RF frequencies.
| Frequency | Loss / 100 ft | Loss / ft | 6 ft | 25 ft |
|---|---|---|---|---|
| 100 MHz | 3.5 dB | 0.035 dB | 0.21 dB | 0.88 dB |
| 450 MHz | 7.5 dB | 0.075 dB | 0.45 dB | 1.88 dB |
| 900 MHz | 10.8 dB | 0.108 dB | 0.65 dB | 2.7 dB |
| 1.8 GHz | 15.5 dB | 0.155 dB | 0.93 dB | 3.88 dB |
| 2.4 GHz | 18.5 dB | 0.185 dB | 1.11 dB | 4.63 dB |
| 5.8 GHz | 30 dB | 0.3 dB | 1.8 dB | 7.5 dB |
RG402 Power Handling
Approximate maximum continuous power (CW) at 25°C ambient.
| Frequency | Max Power (W) |
|---|---|
| 100 MHz | 130 W |
| 450 MHz | 55 W |
| 900 MHz | 37 W |
| 1.8 GHz | 25 W |
| 2.4 GHz | 21 W |
| 5.8 GHz | 12 W |
Construction & Materials
Center Conductor
Silver-plated copper clad steel, 0.92mm
The center conductor carries the RF signal. Material and diameter affect DC resistance, skin effect losses, and overall attenuation.
Dielectric
Solid PTFE
The dielectric insulator separates the center conductor from the shield. PTFE dielectrics offer superior temperature stability and lower loss versus polyethylene.
Shield
Solid copper outer conductor
The outer conductor provides the return path and shields the signal from external interference. More braid coverage means better EMI rejection.
Jacket
None (semi-rigid)
The outer jacket protects the cable from physical damage, UV, chemicals, and moisture. PTFE and FEP jackets handle higher temperatures than PVC.
Velocity Factor
69% (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
1500 VRMS
The maximum continuous operating voltage. Exceeding this can cause dielectric breakdown. Relevant for high-power transmitters and pulse applications.
Available RG402 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 $9.99
SMA FEMALE to SMA MALE
From $9.99
RP-SMA MALE to SMA MALE
From $9.99
RP-SMA FEMALE to SMA MALE
From $9.99
N MALE to SMA MALE
From $10.49
SMA FEMALE to SMA FEMALE
From $9.99
RP-SMA MALE to SMA FEMALE
From $9.99
RP-SMA FEMALE to SMA FEMALE
From $9.99
N MALE to SMA FEMALE
From $10.49
RP-SMA MALE to RP-SMA MALE
From $9.99
RP-SMA FEMALE to RP-SMA MALE
From $9.99
N MALE to RP-SMA MALE
From $10.49
RP-SMA FEMALE to RP-SMA FEMALE
From $9.99
N MALE to RP-SMA FEMALE
From $10.49
N MALE to N MALE
From $10.99
Frequently Asked Questions
What is the impedance of RG402?
RG402 is a 50 Ohm coaxial cable. All standard RF systems (antennas, transceivers, test equipment) use 50-ohm impedance, so RG402 connects directly without any matching network.
What frequency range does RG402 support?
RG402 is rated DC – 20 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 RG402 have?
RG402 has 3.5 dB of attenuation per 100 ft at 100 MHz, rising to 30 dB per 100 ft at 5.8 GHz. Use the attenuation table above to calculate loss for any specific length and frequency.
Are CoaxRF RG402 cable assemblies made in the USA?
Yes. Every RG402 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 RG402?
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.