Smith Charts: DEMO 1 - Parallel Stub Match Design & Build (00h8) скачать в хорошем качестве

Smith Charts: DEMO 1 - Parallel Stub Match Design & Build (00h8)

In this video I will be designing, building and testing a parallel stub match to match my perfectly horrible load to a 50 Ohm feedline. The main purpose of this is to cover more of the practical aspects of the whole process than to go over the design process in detail. I will show how even the most carefully designed and built stub match may require a little adjustment to dial it in to what you want. Unfortunately, real life and theory rarely agree 100% ... but they CAN be quite close. 00:05 Introduction 02:09 Start the Process 02:22 STEP 1 = Measure the actual Impedance 03:51 STEP 2 = Know Your Coax (Measuring the Velocity Factor) 04:19 Measuring coax Velocity Factor with a VNA 06:57 All the Facts in One Place - What are we working with? 07:35 STEP 3 = Normalize your measured Impedance 08:00 STEP 4 = Plot the Normalized Impedance on the Smith Chart & draw the SWR circle 09:17 STEP 5 = Convert the Impedance to Admittance using the Smith Chart & read lambda(load) 10:53 STEP 6 = Move to the G = 1.0 Circle & read Admittance(a) here and lambda(a) 12:35 STEP 7 = Calculate coax length from Load to Stub (Impedance Transforming) 14:33 STEP 8 = Determine the lambda(Stub) 17:35 STEP 9 = Calculate the length of the coax for the Stub (Reactance Eliminating) 18:49 CONSTRUCTION BEGINS - Introduction 19:51 On the bench - important things to remember in construction 22:52 How to make the SHORTED end of a SHORTED Stub 23:53 How to make the OPEN end of an OPEN stub 24:07 The completed Stub Match - A Tour 24:35 Initial Test Results and final adjustments 27:34 Final comments and Toodle-oots :-)