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What advantage does a pi-L network have over a pi-network for impedance matching between a vacuum tube linear amplifier and a multiband antenna?
Greater harmonic suppression
A Pi-L network (Pi followed by an L-section, effectively adding another series inductor and shunt capacitor) generally provides better harmonic attenuation than a simple Pi-network due to its increased complexity and number of reactive elements, acting as a more effective low-pass filter.
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