Part # Construction Type  RG Type  Impedance  Shielding  AWG  Stranding  Core Diameter  Jacket Diameter  Applicable Specifications 
M4220 COAX  108 A/U  78  BRAID  20  7/28  0.079  0.235  CA Prop 65, MIL-C-17/RG 108 TYPE 
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 Diameters (In)
1) Component 1 2 X 1 COAX 
a) Conductor 20 (7/28) AWG TC 0.038
b) Insulation 0.0205" Wall, Nom. Polyethylene(PE) 0.079
(1) Color(s)  
Cond Color Cond Color Cond Color
1 NATURAL 2 NATURAL 
2) Cable Assembly 2 Components Cabled 
a) Twists: 4.8 Twists/foot (min) 
3) Shield TC BRAID Shield,85% Coverage, Min. 
4) Jacket 0.028" Wall, Nom.,Type IIA PVC0.235 (0.245 Max.)
a) Color(s) BLACK
b) Print ALPHA WIRE-* P/N M4220
RG108 TYPE CE ROHS
* = Factory Code
1) Military MIL-C-17/ RG 108 TYPE 85°C / 750 VRMS
2) CE:EU Low Voltage Directive 2006/95/EC
1) CE: EU Directive 2011/65/EU(RoHS2):
 This product complies with European Directive 2011/65/EU (RoHS Directive) of the European Parliament and of the Council of 8 June 2011. No Exemptions are required for RoHS Compliance on this item. Consult Alpha Wire's web site for RoHS C of C.
2) REACH Regulation (EC 1907/2006):
 This product does not contain Substances of Very High Concern (SVHC) listed on the European Union's REACH candidate list in excess of 0.1% mass of the item. For up-to-date information, please see Alpha's REACH SVHC Declaration.
3) California Proposition 65:The outer surface materials used in the manufacture of this part meet the requirements of California Proposition 65.
Physical & Mechanical Properties
1) Temperature Range-40 to 85°C
2) Bend Radius 10X Cable Diameter
3) Pull Tension 21.4 Lbs, Maximum
Electrical Properties(For Engineering purposes only)
1) Voltage Rating 750 VRMS
2) Characteristic Impedance 78 Ω +/- 7
3) Inductance 0.119 µH/ft, Nominal
4) Mutual Capacitance 19.7 pf/ft @1 kHz, Nominal
5) Ground Capacitance 45.1 pf/ft @1 kHz, Nominal
6) Velocity of Propagation 66 %
7) Conductor DCR 9.5 Ω/1000ft @20°C, Nominal
8) OA Shield DCR 5.3 Ω/1000ft @20°C, Nominal
9) Attenuation, Nom dB/100ft 0.7 @ 1 MHz
  2.3 @ 10 MHz
  5.2 @ 50 MHz
  7.5 @ 100 MHz
  11 @ 200 MHz
  16 @ 400 MHz
PackagingFlange x Traverse x Barrel (inches)
a) 1000 FT 12 x 10 x 5 Continuous length
b) 500 FT 12 x 4.5 x 3.5 Continuous length
c) 100 FT 6.5 x 4 x 2.5 Continuous length
d) Bulk(Made-to-order) 
 [Spool dimensions may vary slightly]
Notes:
a) One conductor has a bare strand for identification.

For a complete range of 50, 75, 93, and 100 ohm coaxial, twinaxial, and triaxial cables, we offer a wide range of insulations and jackets meeting the requirements of military specifications and regulatory agencies such as UL and CSA. For broadcastquality video transmission, our precision video cables use FEP dielectrics to achieve low capacitance, high velocities of propagation, and tight tolerances for maximum signal integrity.

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