PS780LS-18G-F High Flex Low Loss Phase Stable Cable | 18GHz
High Flexibility Phase Stable RF Coaxial Cable (18GHz)
PS780LS-18G-F is engineered specifically for dynamic bending and high-flex environment applications up to 18 GHz. Featuring a 19-strand silver-plated copper inner conductor (19/0.48mm) and LD-PTFE dielectric, it provides superior flex fatigue resistance and phase stability during motion while maintaining excellent electrical efficiency.
Max Frequency:DC-18GHz
Velocity of Prop.：83%
Screening Effectiveness: > 90 dB
Outer Diameter:7.8mm
780 Series Family Selection Guide
The 780 series cables share a ~7.80mm outer diameter platform designed for 18GHz phase-stable performance. Choose the optimal sub-model based on your mechanical requirements:
| Model | Conductor Type | Shielding Layer | Atten. @18GHz | Best Suitable Application |
|---|---|---|---|---|
| PS780L-18G-F | Solid (1/2.30mm) | Double Shield | 66.98 dB/100m | Standard low-loss interconnects & static routing. |
| PS780LS-18G-F (This Model) | Stranded (19/0.48mm) | Double Shield | 75.30 dB/100m | Dynamic bending, test leads, & frequent movement. |
| PS780L-18G-A | Solid (1/2.30mm) | Triple Shield (Foil) | 66.98 dB/100m | High EMI environments & extra mechanical protection. |
Structure & Construction Characteristics
| Structure Layer | Material | Construction | Nom. O.D. (mm) |
|---|---|---|---|
| Inner Conductor | Silver Plated Copper | 19 / 0.48 mm (Stranded) | 2.40 |
| Insulation | LD-PTFE (Low Density PTFE) | – | 6.30 |
| Inner Shield | Silver Plated Copper Strip | Helical Wrap | 6.60 |
| Outer Shield | Silver Plated Copper Wire | Braid | 7.15 |
| Jacket | Gray FEP | – | 7.80 |
Mechanical & Environmental Parameters
| Min. Bending Radius (Static) | 39.0 mm | Weight | 0.130 kg/m |
| Min. Bending Radius (Dynamic) | 78.0 mm | Operating Temperature | -55 to +165 ℃ |
Electrical & Mechanical Characteristics
| Impedance | 50 Ohm | Max Operating Frequency | 18 GHz |
| Velocity of Propagation | 83% | Screening Effectiveness | > 90 dB |
| Capacitance | 80 pF/m | Dielectric Withstanding Voltage | 2500 V DC |
| Phase Change vs Bending | ±0.3 °/GHz | Phase Change vs Temp (-45~+85℃) | ≤ 750 PPM |
Attenuation & Power Handling @ 25℃ & Sea Level
Insertion Loss Calculation: IL = K1 * sqrt(F_MHz) + K2 * F_MHz (dB/100m)
Constants: K1 = 0.51830 | K2 = 0.00032
| Frequency (MHz) | Nominal Attenuation (dB/100m @ 25℃) | Max Power Handling (W @ 40℃) |
|---|---|---|
| 500 | 11.75 | 2269 |
| 1000 | 16.71 | 1594 |
| 2000 | 23.82 | 1117 |
| 3000 | 29.35 | 906 |
| 4000 | 34.07 | 780 |
| 6000 | 42.08 | 631 |
| 8000 | 48.91 | 542 |
| 10000 | 55.03 | 482 |
| 12000 | 60.64 | 437 |
| 16000 | 70.62 | 374 |
| 18000 | 75.30 | 351 |
Cross Reference Replacement
PS780LS-18G-F serves as a direct functional equivalent for UFB293C and HF290S flexible phase-stable coaxial cables.
Frequently Asked Questions
What is the main difference between PS780LS-18G-F and PS780L-18G-F?
PS780LS-18G-F uses a 19-strand (19/0.48mm) conductor designed for superior flexibility and dynamic bending durability, whereas PS780L-18G-F uses a solid conductor that yields slightly lower attenuation (66.98 dB/100m vs 75.30 dB/100m at 18GHz).
Why choose stranded conductor cable for test and measurement setups?
Stranded conductors resist work hardening and fatigue caused by repetitive motion or manual manipulation, ensuring longer lifespan and consistent phase behavior in test lead assemblies.
Which industry cables can PS780LS-18G-F directly replace?
It is a drop-in functional replacement for UFB293C and HF290S, matching their physical form factor, 18GHz bandwidth, and flexible mechanical attributes.
