A Folded Dipole for 2-meters (70-cm?) (048) скачать в хорошем качестве

A Folded Dipole for 2-meters (70-cm?) (048)

I created a video a few weeks ago showing how to create a 4:1 BALUN using coax. In this video I created a 4:1 BALUN for the Amateur Radio 2-meter band, centered on 146 MHz. Someone asked the question,"Why would you ever need a 4:1 BALUN for the 2-meter band?" GOOD QUESTION! In answer to this, I am going to show you how to create a folded dipole antenna for the 2-meter band using the 4:1 BALUN previously created as the impedance matching device. I will create two distinct version of this antenna: 1. The Solid Wire Version using #4AWG solid copper wire 2. The Copper Tubing Version using 1/4-in OD copper tubing. I will test this antenna on both the 2-meter and 70-cm bands. The results may surprise you. Here are the promised links for you: =============================================== 4NEC2 Modelling Program Download https://www.qsl.net/4nec2/ 4NEC2 Model for the Folded Dipole https://drive.google.com/file/d/1fWF0... Time Markers for Your Convenience ---------------------------- 00:05 Introductory Comments 01:40 The Plan: 4NEC2 Modeling 07:34 The Bending Jig 08:26 How long do we cut our wire? 11:28 Cutting the wire 12:06 Creating the Antenna using the bending jig 13:20 Preparing for Test 13:23 Tinning the Feedpoint 13:40 Create a Mounting Point 14:41 Connecting the BALUN/Feedline 14:47 Testing Begins 14:59 Call to reality on results ... 15:40 Test Results 15:55 Test Result Debriefing 16:51 The Tubing Version 17:29 How long do we cut the tubing? 18:33 The Assembly Procedure... 19:41 The Actual Build-bending the tubing 20:08 Trimming the excess 20:31 Preparation for testing 20:32 Tin the Feedpoint Ends 20:40 Create the Mounting Device 20:54 Connect the BALUN/Feedline 21:02 TESTING 21:05 Test Results on 2-meters 21:17 What about 70-cm? 22:32 Create a more substantial mounting plate 23:59 Testing the Modified Antenna 24:03 Test Results on 2-meters 24:25 Test Results on 70 cm 25:01 How much lighter is the Tubing Version? 25:34 Final Comments and Toodle-oots -----------------------------