Valid values for maximum continuons operating voltage : SFF-50-3-51 ：1400V ；SFF-50-3-52：900V
Frequency：not more than 3GHz
Ratio：69.5% of the nominal value
DC resistance of inner conductor properties（20℃）：less than 0.064Ω/m Elongation：not less than 1%
Tensile strength：not less than 758N/mm2
Operating temperature range：（-55-200）℃
Inner conductor：silver-plated copper clad steel wire
Outer conductor：silver-plated copper
Insulator：PTFE
Jacket：FEP
Executive standard：SFF-50-3-51 SJ 50973/10 ；SFF-50-3-52 SJ 50973/11-1998