0850: How NOT to Build a 10 dB Attenuator
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In the video coming out on Sunday, July 2, 2023, we'll analyze the attenuator used to test the FM transmitter kit seen in video 847 ( • 0847: TRASMETTITORE FM 88-108 MHz in KIT ). We'll analyze the reasons why the attenuation measured with a spectrum analyzer is over 20 dB instead of 10 dB, as it should be according to Pi filter theory. We'll then build a version of the attenuator that guarantees 10 dB over a wide frequency band and perform measurements to certify the S21, S11, and S22 scattering parameters using the nano VNA instrument.
⏰ Index:
0:00 Prologue and Theme
0:52 Introduction
2:10 Measurements on a homemade attenuator
5:00 Grounding made with a copper-plated base
6:30 Anti-inductive components
7:18 Measurements on a version 2 attenuator
8:13 Bandwidth increase
9:05 Teardown of inductive components
9:50 Measurements with NanoVNA
10:29 Measurements of parameters S21, S11, S22
13:00 SWR measurement
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