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The FME Series is originally designed for European wireless market and used for mobile antenna applications. It is a miniature screw coupling coaxial that has a 50 ohm impedance. They offer excellent electrical performance from DC to 3.0 GHz.
Wireless Telecommunications  
Interface Mating Dimensions:

Interface Dimension in Millimeters
Male Female
mm mm
  Min. Max.   Min. Max.
A 1.25 nom A    
B     B 1.35 Resilient
C 4.70   C   3.80
D 0.00 1.00 D 4.00 5.00
E     E   2.60
F 9.00   F 4.90  
G 6.40   G 7.60  
H     H   6.80
I M8x0.75 I M8x0.75
      K SW8  
Technical Characteristics
Impedance 50 ohm
Frequency Range 0 - 3 GHz
Working Voltage 500 VRMS max.
Dielectric Withstanding Voltage 1000 VRMS
VSWR Straight 1.3 max.
Right Angle 1.5 max.
Contact Resistance Center Contact 10 Milliohm Max.
Outer Contact 5 Milliohm Max.
Insulator Resistance 5000 Mega ohms min.
Part Name Material Finish
Body, Metal Parts Brass Nickel or Gold
Center Contacts Plug: Brass Gold
  Jack: Brass or Phosphor Bronze Gold
Insulator PTFE or Delrin  
Crimp Ferrule Annealed Copper Nickel or Gold
Clamp Gaskets Silicone Rubber  
Mechanical & Environmental
Durability (Mating) 300 cycles min.
Temperature Range -65°C ~ 155 °C