Which option correctly expresses the requirement for RF cable clamps?

Which option correctly expresses the requirement for RF cable clamps?

• A. The clamp must be oversized to fit many cables.
• B. The clamp must fit without crushing the cable and be snug enough to prevent movement while allowing slight axial sliding.
• C. The clamp color should match cable sheath.
• D. The clamp should be made of plastic for weight.

Answer: (B)

The key point is securing RF cables without stressing them while still preventing movement. RF/coax cables carry signals that rely on a precise geometry of the outer conductor and dielectric. If a clamp crushes the cable, it can deform the shield and dielectric, change impedance, cause micro-bends, or create hotspots that increase losses or reflections. A clamp that is snug enough to stop the cable from moving stops wear, vibration damage, and EMI noise, but still allows a little axial sliding, accommodates thermal expansion and vibration without transmitting harmful stress to the connector or the cable itself. The other options miss the important emphasis on mechanical stress, impedance, and shielding integrity. An oversized clamp can let the cable shift and wear, potentially harming performance; color matching has no functional impact on RF performance; and focusing on weight or using plastic ignores the need for maintaining electrical shielding and structural integrity under operating conditions.

The key point is securing RF cables without stressing them while still preventing movement. RF/coax cables carry signals that rely on a precise geometry of the outer conductor and dielectric. If a clamp crushes the cable, it can deform the shield and dielectric, change impedance, cause micro-bends, or create hotspots that increase losses or reflections. A clamp that is snug enough to stop the cable from moving stops wear, vibration damage, and EMI noise, but still allows a little axial sliding, accommodates thermal expansion and vibration without transmitting harmful stress to the connector or the cable itself.

The other options miss the important emphasis on mechanical stress, impedance, and shielding integrity. An oversized clamp can let the cable shift and wear, potentially harming performance; color matching has no functional impact on RF performance; and focusing on weight or using plastic ignores the need for maintaining electrical shielding and structural integrity under operating conditions.