 |
Explanation to Physical High
Foaming Coaxial Cable:
Physical Foaming Coaxial Cable is a kind of
semi-air conductivelyclosed coaxial cable. Inner conductor is made
of non-oxygen copper-wire, conductivelyclosed conductor is made of
air vent in which polyethylene is under physical foaming, being exiguous
and closed down each other. Inner conductor and conductivelyclosed
conductor are firmly fixed. The product possesses many outstanding
advantages, such as excellent highfrequency features, low attenuation
features and good coherence capacity, against damp and ageing, goo
d mechanical features and etc., It is widely used in wire TV system..
SYWV（Y）-75型系列电缆结构尺寸 |
| 型号SYWV（Y）-75 |
-5 |
-7 |
-9 |
-12
|
|
|
| 内导体直经mm |
1.00+0.02 |
1.66+0.02 |
2.15+0.03 |
2.77+0.03 |
| 绝缘体外径mm |
4.80+0.20 |
7.25+0.20 |
9.00+0.25 |
11.50+0.3 |
| 护套厚度mm |
0.80 |
0.95 |
1.05 |
1.15 |
| 电缆外径mm |
7.0+0.30 |
10.3+0.30 |
12.3+0.3 |
15+0.3 |
| 参考重量kg/km |
41 |
58 |
80 |
125 |
|
|
SYWV（Y）-75型系列电缆电气性能
| 型号SYWV（Y）-75 |
|
-5 |
-7 |
-9 |
-12
|
|
|
| 绝缘电阻MΩ.km |
|
500V直流20℃≥5000 |
500V直流20℃≥5000 |
500V直流20℃≥5000 |
500V直流20℃≥5000 |
| 缆芯介电强度KV |
|
1.6 |
1.6 |
1.6 |
1.6 |
| 护套介电强度KV |
火花 |
3.0 |
5.0 |
8.0 |
8.0 |
| 浸水 |
2.0 |
3.0 |
5.0 |
5.0 |
电容PF/m
特性阻抗Ω |
|
52
75.0+3.0 |
52
75.0+3.0 |
52
75.0+3.0 |
52
75.0+3.0 |
| 回波损耗(db)min |
VHF |
20 |
20 |
20 |
20 |
| UHF |
18 |
18 |
18 |
18 |
| 衰减常数db/100m |
50MHZ |
4.8 |
3.2 |
2.4 |
1.9 |
| 200 MHZ |
9.7 |
6.4 |
5.0 |
3.9 |
| 300 MHZ |
11.9 |
7.9 |
6.2 |
4.8 |
| 450 MHZ |
14.5 |
9.7 |
7.6 |
5.9 |
| 550 MHZ |
16.8 |
10.7 |
8.5 |
6.7 |
| 750 MHZ |
19.7 |
12.9 |
10.1 |
7.9 |
| 800 MHZ |
20.3 |
13.3 |
10.4 |
8.2 |
| 860 MHZ |
21.0 |
13.8 |
10.8 |
8.5 |
| 1000 MHZ |
22.7 |
14.9 |
11.7 |
9.2 |
|
|
|
|
