弟兄门，帮我看看衰减指标能实现吗？指标该定多少？

RG59

CONDUCTOR:

AWG 20

Stranding: Solid

Conductor Diameter: .032 in.

Conductor Material:  BCCS - Bare Copper Covered Steel

INSULATION:

Insulation Material: Gas-injected FPE - Foam Polyethylene

Insulation Diameter: .144 in.

Bonded Aluminum Foil-Polyester Tape-AluminumFoil 100%

Braid AL - Aluminum 40%

OVERALL NOMINAL DIAMETER:

Overall Nominal Diameter: .237 in.

MECHANICAL CHARACTERISTICS:

Operating Temperature Range: -40°C To +80°C

Max. Recommended Pulling Tension: 80 lbs.

APPLICABLE SPECIFICATIONS AND AGENCY COMPLIANCE:

APPLICABLE STANDARDS:

NEC/(UL) Specification CATV, CM

CEC/C(UL) Specification CM

ELECTRICAL CHARACTERISTICS:

Nom. Characteristic Impedance 75 +/- 3 Ohms

Nom. Inductance .097 µH/ft

Nom. Capacitance Conductor to Shield 16.2 pF/ft

Nominal Velocity of Propagation 83 %

Nominal Delay 1.2 ns/ft

Nom. Conductor DC Resistance @ 20 Deg. C 44.5 Ohms/1000 ft

Nominal Outer Shield DC Resistance @ 20 Deg.C 17 Ohms/1000 ft

Nom. Attenuation :

Description Frequency (MHz)                                  Nom. Attenuation (dB/100 ft.)

5                                                                                             0.8

55                                                                                           1.8

211                                                                                         3.4

500                                                                                         5.2

750                                                                                         6.5

862                                                                                         7.0

1000                                                                                       7.7

1450                                                                                       9.3

1800                                                                                      10.3

2250                                                                                      11.9

［cuijiude 在 2008-10-30 21:38:15 编辑过］

楼上的大虾,指点一下吧.

谢谢

楼主你确认它的单位为100ft?

5MHZ 小于3.9/100m,1000MHZ 小于27/100M保守

還要看BCCS的電導率是多少了？

kaka2004:

還要看BCCS的電導率是多少了？

客户要求永远都是苛刻的，，没有什么过分。因为他就是你的上帝。。。

能不能做到就看你家的能力。既然有这样的要求肯定是可以做到的。我想他们是从BELDEN网上复制的。

有点难,但总会有办法的

单位没有错!

感谢各位指点,受教了.

我考虑导电率为26%(放宽10%).

请教5楼的兄弟,发泡材料的选择上有何讲究?

我理论计算的衰减怎么也不可能满足指标,不知道怎么回事?

我按照射频电缆设计规范计算的,哪为仁兄帮我指导其中的问题.

请教2楼，可以做到12。5吗？怎么做？