APPENDIX
68
Notes:
(1) = Center Conductor to Inner Braid
(2) = Conductor to Shield
(3) = Conductor to Conductor
Twinax/Triax: Plenum/Halogen Free Cable Specs
Twinax Triax
Cable Designation TWCP-78-1 TWCP-78-2 TWCH-78-2 TWCP-124-2 TWCP-124-3 TWCP-124-5 TRCH-50-2
Description Plenum Plenum Halogen Free Plenum Plenum Plenum Halogen Free
Impedance (Ohms) 78±3 78±3 78±3 124±4 124±4 124±5 50±2
Nominal outer dia. 0.150 0.242 0.242 0.245 0.205 0.325 0.245
Outer braid dia. 0.102 0.165 0.195 0.183 0.183 0.295 0.210
Core outer dia. 0.154 0.163
Dielectric outer dia. 0.041 0.072 .076 0.080 0.062 0.134 0.116
Inner braid outer dia. 0.043 0.146
Inner jacket outer dia. 0.175
Conductor outer dia. 0.021 0.037 0.037 0.024 0.024 0.048 0.037
Operating temperature
range
+125°C +125°C -30°C to +80°C +125°C -10°C to +75°C -10°C to +125°C -30°C to +80°C
Minimum bend radius
(in/ft.)
1.50 2.50 1.25 2.5 2.0 3.25 1.25
Max. Opr. VDC 2KV 2500 2500 6 KV
Max. Opr. VAC (RMS) 1KV 1KV 1800 1800 2 KV
Capacitance pf/ft. (Max) 19.6 (3) 18.6(3) 21.2(3) 11.5 12.0(3) 11.0(3)
Cond. loop res.
(Ohms/M ft.)
19.0 47.0 28.4 6.5(3) 10.5
Atten. dB/100 ft.:
1 MHz 2.00 .60 0.70 .50 0.60 .30 0.50
3 MHz 3.00 1.00 1.10 .85 0.90 .47 0.80
4 MHz 3.50 1.20 1.40 1.10 .64 0.90
5 MHz 4.00 1.40 1.55 1.10 1.20 .69 1.10
7 MHz 4.50 1.60 1.80 1.30 1.40 .79 1.30
10 MHz 5.30 2.00 2.20 1.60 1.60 .94 1.50
20 MHz 7.50 2.80 3.10 2.30 2.20 1.20 2.30
30 MHz 9.20 3.50 3.90 2.80 1.50 2.90
40 MHz 10.60 4.10 4.50 3.20 1.70 3.40
50 MHz 11.90 4.60 5.10 3.70 3.60 2.00 3.90
100 MHz 16.80 6.90 7.50 5.30 5.20 3.00 5.80
200 MHz 23.70 9.90 10.50 7.20 4.50 8.80
500 MHz 37.50 15.40 16.00 11.40 7.00 15.30
700 MHz 44.30 18.30 18.60 13.50 8.40 18.00
1 GHz 53.00 21.80 22.50 16.20 11.00 23.00
Shielded coverage 97% 95% 93% 93% 93% 93% 93%
Twist per ft. 8.0 4.0 4.0 4.0 6.0 6.0
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