PS700L-19G Phase Stable Coaxial Cable | Tflex-401 Alternative
19GHz High Frequency | Solid PTFE Dielectric | Dual Silver-Plated Shielding
PS700L-19G is a high-reliability, low-loss 50 Ohm microwave coaxial cable designed for phase-critical RF connections. Featuring a solid PTFE dielectric and double silver-plated copper shields, it delivers outstanding electrical consistency up to 19 GHz and seamlessly replaces Tflex-401 in system redesigns.
Max Frequency:DC-19GHz
Velocity of Prop.：70%
Screening Effectiveness: > 90 dB
Outer Diameter:7.0mm
Structure & Construction Characteristics
| Construction Layer | Material Spec | Nom. O.D. (mm) |
|---|---|---|
| Inner Conductor | Silver Plated Copper (SPC) | 1.63 |
| Dielectric | Solid PTFE | 5.45 |
| Inner Shield | Silver Plated Copper Strip | 5.65 |
| Outer Shield | Silver Plated Copper Wire Braid | 6.15 |
| Jacket | FEP (Fluorinated Ethylene Propylene) | 7.00 |
Mechanical & Environmental Parameters
| Parameter | Specification | Unit / Condition |
|---|---|---|
| Min. Bending Radius (Static) | 35.0 | mm |
| Min. Bending Radius (Dynamic) | 70.0 | mm |
| Weight | 0.140 | kg/m |
| Operating Temperature | -55 to +125 | °C |
Electrical & Mechanical Characteristics
| Electrical Parameter | Standard Value | Unit |
|---|---|---|
| Impedance | 50 | Ω |
| Capacitance | 94 | pF/m |
| Velocity of Propagation | 70 | % |
| Cut-off Frequency | 19 | GHz |
| Screening Effectiveness | > 90 | dB |
| Dielectric Withstanding Voltage | 3000 | V DC |
| Phase Change vs Bending | ±0.3 | °/GHz |
Attenuation & Power Handling @ 25℃ & Sea Level
Formula: IL (dB/100m) = K1 * sqrt(F_MHz) + K2 * F_MHz (where K1 = 0.688976, K2 = 0.003937)
| Frequency (MHz) | Nom. Attenuation (dB/100m) | Max Power Handling (W @ 40°C) |
|---|---|---|
| 300 | 13.11 | 1598 |
| 500 | 17.37 | 1598 |
| 1000 | 25.72 | 1079 |
| 2000 | 38.69 | 718 |
| 3000 | 49.55 | 560 |
| 6000 | 76.99 | 361 |
| 8000 | 93.12 | 298 |
| 10000 | 108.27 | 256 |
| 12400 | 125.54 | 221 |
| 15000 | 143.44 | 194 |
| 18000 | 163.30 | 170 |
Direct Replacement / Cross Reference Guide
PS700L-19G matches key mechanical dimensions, impedance, and attenuation profiles of industry-standard 0.290-inch solid PTFE cables, allowing direct drop-in replacement without re-designing system layouts or changing connector tooling.
| Target Standard Model | Form Factor / Outer Diameter | Impedance / Frequency | PS700L-19G Compatibility |
|---|---|---|---|
| Tflex-401 | 7.00 mm (0.276 in) | 50 Ω / 19 GHz | 100% Direct Drop-in Equivalent |
Frequently Asked Questions
How does PS700L-19G perform as a direct replacement for Tflex-401?
PS700L-19G maintains identical key dimensions (7.00mm outer jacket, 1.63mm SPC inner conductor) and electrical matching (50 Ω, 70% velocity of propagation) to Tflex-401. RF engineers can transition directly without modifying standard solder/crimp connectors, mounting brackets, or system attenuation budgets.
What structural advantage does the dual silver-plated shield provide at high frequencies up to 19 GHz?
The combination of an inner helically-wrapped silver-plated copper strip and an outer silver-plated braid provides >90 dB shielding effectiveness. This prevents inter-channel crosstalk in densely packed RF systems while drastically lowering surface resistance (skin effect loss) up to 19 GHz.
What are the strict bending guidelines to maintain phase stability during dynamic installation?
The static minimum bending radius is 35.0 mm, while dynamic flexing should maintain a minimum radius of 70.0 mm. Adhering to these limits guarantees phase stability within ±0.3°/GHz and prevents micro-deformation of the solid PTFE dielectric core.
How do temperature extremes (-55°C to +125°C) affect the dielectric and mechanical reliability?
Featuring a solid PTFE dielectric paired with an FEP outer jacket, PS700L-19G resists thermal aging, moisture absorption, and chemical exposure, ensuring consistent VSWR and power handling in defense radar, aerospace, and outdoor microwave link enclosures.
