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RG-400 cable design
Structurally, it is a coaxial cable RG-400 consists of:
- central conductor: stranded 19x0,2 mm of silver-plated copper, with a total diameter of 0,98 mm
- dielectric made of solid photoplastic (PTFE) with a diameter of 2,95 mm
- first shielding layer: braiding of silver-plated copper with a diameter of 3,48 mm
- second shielding layer: silver-plated copper braid with a diameter of 3,95 mm
- outer protective sheath made of fluoroplastic (FEP) with a diameter of 4,95 mm
Electrical characteristics of the RG-400 cable
Wave resistance: 50 ohms
Linear capacitance: 95 pF/m
Relative speed: 69,5%
Maximum frequency: 34 GHz
Nominal permissible alternating voltage: 1000 V DC
Dielectric strength (for 1 min): 5000 V RMS
Shielding efficiency: ≥70 dB (5-1000 MHz)
Losses and allowable power for RG-400 cable
| Frequency, MHz | Losses, dB/100 m* | Power, W** |
| 50 | 9,6 | 3500 |
| 100 | 13,5 | 2400 |
| 400 | 31,3 | 1100 |
| 1000 | 53,6 | 650 |
| 3000 | 113,3 | 330 |
| 10000 | 232,5 | 135 |
| 12400 | 268,3 | 120 |
* Typical values for 20ºС and altitude above sea level
** The value of the permissible average power for an ambient temperature of 40ºC
Mechanical characteristics of the RG-400 cable
Linear weight: 66.5 g/m
Minimum bending radius: 50 mm
Minimum radius of repeated bending: 100 mm
Compatibility and analogues
The RG-400 coaxial cable is included in the G5 cable group and is similar in size to the following widely used types of HF coaxial cables: RG-223/U, RG-400,
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