谁知道625电缆 ZZY电缆  这两种是什么电缆   知道的望告知  谢谢

P3 625 JCAM109 / P3 625JCAM109

75 Ohm Coaxial Cable
Trunk & Distribution

PRODUCT DESCRIPTION: (AERIAL CONSTRUCTION)
SOLID ALUMINUM TUBE SWAGED ONTO DIELECTRIC 
CORE, FULLY BONDED COPPER CLAD CENTER CONDUCTOR    
MEDIUM DENSITY PE JACKET,  “FIGURE 8” INTEGRATED
MESSENGER
 
CENTER CONDUCTOR:
COPPER CLAD ALUMINUM
NOMINAL DIAMETER: 0.137” (3.48 mm)
 
DIELECTRIC:
MICRO-CELLULAR FOAM PE
NOMINAL DIAMETER 0.565” (14.35 mm) 
 
SHIELD:
SOLID ALUMINUM TUBE
    NOMINAL OUTER CONDUCTOR THICKNESS: 0.030” (0.76 mm)
    
JACKET:
  MEDIUM DENSITY PE
  NOMINAL JACKET DIAMETER: 0.685” (17.40 mm)
  NOMINAL JACKET THICKNESS: 0.030” (0.76 mm)
 
MESSENGER:
    NOMINAL DIAMETER OF STEEL MESSENGER: 0.109” (2.77 mm)
    MINIMUM BREAKING STRENGTH OF MESSENGER: 1,800 lbs. (816 kgf) 
  
MECHANICAL CHARACTERISTICS:
  MINIMUM BEND RADIUS STANDARD: 7.0” (17.8 cm) 
  MINIMUM BEND RADIUS: BONDED = 4.5” (11.4 cm)
  MAXIMUM PULLING TENSION = 475 lbs. (216 kgf)
 
ELECTRICAL CHARACTERISTICS:  
  CAPACITANCE:    15.3 ± 1.0 pf/ft. (50 ±3.0 nf/km)
  IMPEDANCE:    75 ± 2 Ohms    
  VELOCITY OF PROPAGATION:    87% NOMINAL
  NOMINAL DC LOOP RESISTANCE @ 68oF:   1.10 Ohms/1000 ft. (3.51 Ohms/km)
ATTENUATION @ 68oF (20oC):

@ Frequency MHz  dB/100 ft. (MAX.)  dB/100 meters (MAX.)
5 MHz  0.13   0.43
55 MHz  0.46   1.51
83 MHz  0.57  1.87 
211 MHz  0.92  3.02
250 MHz  1.00  3.28
300 MHz  1.08  3.54
350 MHz  1.18  3.87
400 MHz  1.27  4.17
450 MHz  1.35  4.43
500 MHz  1.43  4.69
550 MHz  1.50  4.92
600 MHz  1.58  5.18
750 MHz  1.78  5.84
865 MHz  1.93  6.33
1000 MHz  2.07  6.79