KEYSIGHT Rf Cable Z5623A-K20-FG 3.5 36 8121-0924

( Brand: Keysight ), ( Manufacturer Part Number: Z5623A-K20 ), ( Part Type: Cable ), ( Country Of Origin: United States )

Review KEYSIGHT 3.5mm To Rf Cable 36 Inches

The **Keysight Z5623A-K20 (8121-0924) and Z5623A-K20-FG 3.5 mm RF Cable** is a high-performance, precision-engineered coaxial cable designed specifically for demanding RF and microwave applications within Keysight Technologies advanced test and measurement systems. This cable is engineered to deliver exceptional signal integrity, minimal insertion loss, and robust reliability across a broad frequency spectrum, making it an ideal choice for applications requiring ultra-low distortion and high fidelity in both laboratory and field environments.

Constructed with **3.5 mm male-to-male connectors** (standardized as **Z5623A-K20** for the basic model and **Z5623A-K20-FG** for the flexible variant), this cable is built to interface seamlessly with Keysight s **N5242A, N5244A, N5247A, and N5249A PNA-X network analyzers**, as well as other high-end RF instruments requiring a stable and low-loss connection. The **8121-0924** part number denotes a **3.5-meter (11.81 feet) length**, providing a balanced compromise between flexibility and manageability for most bench-top and semi-portable setups. The **K20 designation** indicates a **low-loss, high-frequency performance** variant, optimized for applications extending beyond 20 GHz, where signal degradation due to cable losses can significantly impact measurement accuracy.

The cable s **flexible (FG) variant** offers enhanced maneuverability without compromising structural integrity, making it particularly suitable for dynamic test setups where cables must frequently be repositioned or routed around obstructions. Both versions feature **high-purity silver-plated connectors** with **gold-plated contacts**, ensuring superior conductivity, resistance to corrosion, and long-term reliability even in humid or corrosive environments. The **PTFE (polytetrafluoroethylene) dielectric core** provides an exceptionally low loss tangent and stable dielectric constant, minimizing signal attenuation and phase distortion across the entire frequency range. Additionally, the **copper-clad steel (CCS) or solid copper braid shielding** offers robust electromagnetic interference (EMI) rejection, protecting the transmitted signals from external noise while maintaining signal purity.

Ideal for **RF/microwave testing, antenna measurements, impedance analysis, and network analysis**, this cable is engineered to meet the stringent requirements of modern test and measurement applications. Its **low return loss and high power handling capability** make it suitable for both low-level signal testing and higher-power applications where signal integrity is critical. The **durable construction**, combined with the **precision-machined connectors**, ensures a secure and repeatable connection, reducing the risk of signal degradation or intermittent contact issues that can plague lower-quality cables. Whether used in **R&D laboratories, manufacturing test floors, or field deployments**, the Keysight Z5623A-K20 (8121-0924) and its flexible counterpart deliver the performance and dependability required for precise RF measurements.

### **Pros and Cons of buying a Keysight Z5623A-K20 (Z5623A-K20-FG) 3.5 RF Cable (Part #8121-0924)**

1. **High-Quality Construction** The cable is designed for professional RF applications, featuring durable shielding and reliable connectors (likely SMA or similar) to minimize signal loss and interference.

2. **Compatibility with Keysight Instruments** Specifically engineered for Keysight s Z5623A spectrum analyzer, ensuring optimal performance and signal integrity when used with this device.

3. **Low Loss and High Stability** The 3.5 mm (or similar) diameter and high-quality materials reduce signal attenuation, making it suitable for precise measurements in RF testing.

4. **Durable and Long-Lasting** Built to withstand repeated use in laboratory or field environments, reducing the need for frequent replacements.

5. **Official Keysight Part** Purchasing from Keysight or an authorized distributor ensures authenticity and access to technical support if needed.

6. **Compatibility with Accessories** The FG variant may include additional features (e.g., ferrite chokes, improved shielding) for better noise rejection in noisy environments.

7. **Warranty and Support** Keysight products typically come with manufacturer warranties, providing peace of mind against defects.

1. **High Cost** As an official Keysight part, the price is likely premium compared to generic RF cables, which may be a barrier for budget-conscious buyers.

2. **Limited Use Beyond Keysight Equipment** While high-quality, it may not be as versatile as universal RF cables that work with multiple brands.

3. **Potential Overkill for Basic Applications** If you only need occasional RF measurements, a more affordable generic cable might suffice without sacrificing performance.

4. **Connector Compatibility Issues** If your equipment uses non-standard connectors, you may need adapters, adding extra cost.

5. **Lead Times** Since it s a specialized part, availability may vary, and ordering from Keysight directly could result in longer delivery times compared to third-party sellers.

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### **Conclusion**

The **Keysight Z5623A-K20 (8121-0924) RF cable** is a high-performance, reliable choice for users working exclusively with Keysight spectrum analyzers. Its superior shielding, low signal loss, and official support make it ideal for professional RF testing environments where precision is critical. However, the cost may be prohibitive for casual users or those on a tight budget, and generic alternatives could be sufficient for non-critical applications.

If you **require maximum signal integrity, long-term reliability, and compatibility with Keysight instruments**, this cable is a strong investment. If you **need a cost-effective solution for general RF work or multi-brand compatibility**, a high-quality third-party cable (e.g., from LEMO, Amphenol, or MITEQ) may be a more practical choice.

- You are a professional user working exclusively with Keysight equipment.

- Signal integrity and long-term durability are non-negotiable.

- You value official support and warranty coverage.

- You need a more budget-friendly option for occasional use.

- You work with multiple RF brands and require universal compatibility.

- You can find a high-quality generic cable with similar specifications at a lower price.

For best results, verify connector types and length requirements before purchasing, as these can significantly impact performance.

Details:

RF and microwave lab measurement. Model: Z5623A-K20. Cable assembly only. length : 36 inches 3 ft.

Used and tested. Built for accurate microwave measurements and reliable calibration performance. S-parameter testing. No original packaging or accessories included.

Removed from a working RF/microwave lab environment. Low Insertion Loss. Removed from operational lab equipment. Designed for repeatable VNA measurements.

High Return Loss Performance. Manufacturer: Keysight Technologies formerly Agent. The Z5623A-K20 is a high-performance, phase-stable 50 Ohm precision test port cable designed for use with Keysight / Agent Vector Network Analyzers. Calibration kit connections.

Keysight Technologies Z5623A-K20 36 Precision 3.5mm VNA Test Port Cable DC to 26.5 GHz. Designed for repeated calibration cycles. Ships securely packaged. Phase-Stable Construction.

Rand production environments. Fully tested and confirmed working. Typical Applications: Vector Network Analyzer test ports. Connectors are clean and mechanically sound.

Stable electrical performance under normal lab flexing. Condition: Used. Torque able coupling nuts.

part #: z5623ak20 prices

• $79.00-$209.75

specifications tesmetequ:

• brand: Keysight
• mpn: Z5623a-k20
• part type: Cable
• country of origin: United States

general tesmetequ:

• condition: Used
• Test, Measurement Inspection > Test Meters Detectors > Other Test Meters Detectors

returns tesmetequ:

• policy: Returns Accepted
• method: Money back
• paid by: Buyer
• time: 30 Days

offer tesmetequ:

• options: Ship-to-home
• quantity: 4
• availability: In Stock
• best offers: True
• sold: 0
• started: February 22, 2026

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• type: Fixed
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• class: Standard
• service: USPS Ground Advantage
• carrier: USPS
• cost: $10.00

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• city: San Marcos, California
• rating: 99.0%
• # reviews: 538

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