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RG303 Coax Specs

Part Number Conductor StrandingNom. Dia. of Cond.Dielectric (in)Nom. O.D. (in)Nom. Imp.Approx LBS/MFTNom. Cap. (pF/ft)
RG303 Solid 0.037 0.116 0.1700 50.0 30.00 29.4

What is RG-303?

The RG-303 Coax Cable is 50 ohm coaxial cable used in a vast array of commercial applications, such as broadcast and radio frequency. In addition, RG 303 cable is also approved for direct burial applications. Click on the links below to learn more about the different features of RG-303 cable.

RG 303 Construction:

  • Conductor: Silver Covered Copper Clad Steel
  • Dielectric: Solid Polytetrafluoroethylene (PTFE)
  • Shielding: Silver Covered Copper
  • Shield Coverage: Overall Braid Shield
  • Jacket Material: Fluorinated Ethylene Propylene (FEP) Type IX per MIL-C-17
  • Jacket Color: Brown Tint

RG303 Coaxial Cable Engineering Information:

Test Result
Attenuation Pass
Structural Return Loss Pass
Cold Bend Pass
Dielectric Withstand Pass
Stress Crack Resistance Pass
Spark Test (High Frequency) Pass
Dimensional Stability Pass
Workmanship Pass


Construction Result
Impedance (ohms) 50 +/-2
Capacitance (pF/ft) 29.4
Max Voltage 1900
Center Conductor 0.037 in. SCCS
Dielectric Diameter 0.116 in.
Shield SPC
Shield Diameter 0.136 in.
Jacket FEP
Overall Diameter 0.170 in.
Bend Radius 0.9 in.
Weight (lbs/mft) 31.0
RF Leakage -50 dB
Minimum Temperature -55°C
Maximum temperaure 200°C

RG303 Coax Loss Attenuation Table: 

Frequency Result
100 MHz Typ/Max 4.0 / 4.4
400 MHz Typ/Max 8.1 / 9.3
1 GHz Typ/Max 13.4 / 15.3

What applications is RG303 coax used for?

  • The RG303 coax is used in many commercial and military applications. It is commonly used for wireless communication, broadcast, and radio frequency transmission applications. It is also found in TV network, security monitoring systems, and control system applications. The RG303 is approved for direct burial. 

What is the difference between M17/111-rg303 coax cable vs. RG303 coax cable?

  • M17/111-RG303 is the Mil-Spec equivalent to the commercial grade RG 303 cable. M17/111-RG303 Coax is used for high temperature applications and features a FEP Type IX jacket per MIL-C-17.


Check out our RG303 Coax Youtube Video: