Build Your Own 4:1 BALUN With Coax


 Thank to Ralph Gable of "Electronics for the inquisitive experimenter" for this cheap and easy way to make a  basic 4:1 BALUN.

Ralph takes you step-by-step through the design and construction procedures.  Each step is thoroughly explained and demonstrated.

If you can't see the video, please insert this title URL into your browser search box:  https://www.youtube.com/watch?v=fG7ZpsjXRW8.

Here are a few comments from Ralph:

In this video I am going to show you how to build a 4:1 BALUN using nothing but a length of coaxial cable. I will work through the process of design and construction one step at a time with many pictures to show you how I did it. More than that! I am going to explain WHY it works. I sourced a number of books and the Internet looking for this answer and I was amazed at how little there was out there. Well, not so here. I give you the explanation plain and simple with simple math. ** IMPORTANT NOTE ** At 14:30 I state that 28.79 inches = 78.13 cm. REALITY: 28.79 inches = 73.13 cm Ooops! Well, a 3 does look a lot like an 8. :-/ **Thanks to a viewer for the observant correction!** PROMISED SPEED OF LIGHT NUMBERS: C(in/sec) = 11802852677 in/sec C(cm/sec) = 29979245800 cm/sec Time Markers for Your Convenience ---------------------------- 00:05 Introductory Comments 01:08 The Basic Design 02:32 How does it work 07:37 Designing One 07:37 Gathering needed Information 09:14 Our Design - Information Gathered 11:12 Deciding on a Configuration 13:38 Our choice of configuration 13:57 Calculate the actual length of coax 14:42 Deciding on final Pigtail length 15:03 The Actual Build 15:10 Cutting the BALUN coax to length 15:25 Procuring a feedline 15:37 Cutting the Pigtails 16:07 Stripping the coax and pigtails 16:50 Tinning ALL conductors 17:07 Procure #24AWG wire for BALUN assembly 17:29 Arrange the coax for assembly 18:01 Connecting the shields together with wire 18:20 Soldering the shield connections 19:04 Connect the feedline to the BALUN coax 19:38 Adding the pigtails 19:41 The feedline/BALUN coax pigtail 19:56 The BALUN coax pigtail 20:04 Final Inspection before test 20:27 Testing & Adjustment 20:31 Initial Test with results 21:37 Weatherize your BALUN 22:02 Adjustment 23:20 FINAL TEST RESULTS 23:59 Lessons Learned: Experiment Debriefing 25:45 Final Comments and toodle-oots -----------------------------

Intro

0:00

Design

1:12

Explanation

2:32

Math

5:20

Required Information

7:36

Configurations

11:12

Cutting the feed line

14:57

Stripping the coax

16:06
34 videos
Shop Skills
Electronics for the Inquisitive Experimenter

Follow along using the transcript.

Electronics for the Inquisitive Experimenter

7.57K subscribers
Smith Charts: Introduction to the Series (00h1)
by Electronics for the Inquisitive Experimenter
Velocity Factor: Introduction (00e1)
by Electronics for the Inquisitive Experimenter
------
Thanks for joining us today.

Aloha es 73 de Russ (KH6JRM).

Comments

Post a Comment

Thank you for visiting my Amateur Radio Blog. I value your comments and suggestions. For Amateur Radio Antenna Topics and Discussions, stay here. For Amateur Radio News and Trends, please visit my news site at https://bigislandarrlnews.com.
Aloha es 73 de Russ (KH6JRM).

Popular posts from this blog

G5RV Multi Band HF Dipole Antenna. Post #1555.

Image
If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=aeNHIQ_j4Dk This well-produced and richly illustrated tutorial on the classic G5RV HF Dipole Antenna was presented to the Brandon Amateur Radio Society in Brandon, Florida in 2017 by Bernie Huth (W4BGH).  Bernie does an excellent job of  explaining the pros and cons of this popular HF antenna from the late Louis Varney (G5RV).  Although Varney envisioned his design primarily as a 3/2 wavelength antenna for the 20 meter Amateur Radio band, radio amateurs have used the antenna for multiband use.  The G5RV is an excellent choice for the 20 meter band.  Performance on other HF Amateur Radio bands is good enough to qualify as stand alone HF antenna if you can only erect one HF antenna. For the latest Amateur/Ham Radio news and information, please visit these websites: http://www.HawaiiARRL.info. http://www.arrl.org. http://www.arrl.org/arrl-audio-news (a wee
Read more

Antenna for Condo Backyard-Stealth. Post #1542.

Image
If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=MXTYTytR56A. Don't let deed-restricted properties (HOA/CC&R) stop you from enjoying Amateur Radio.  In this video from AC2RJ, we see how some well-placed trees, a camera tripod, a telescoping fiberglass mast, and a "V" antenna can get you on the air without a lot of effort.  Add an antenna "tuner", a sturdy rig, such as the Yaesu FT-817, a microphone/cw key, and a simple grounding system, and you have a fully functional, nearly invisible ham station in your backyard. For the latest Amateur/Ham Radio news and information, please visit these web sites: http://www.HawaiiARRL.info. http://www.arrl.org. http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon). https://hamradiohawaii.wordpress.com. https://bigislandarrlnews.com. https://amateurradionewsinformation.com (Amateur Radio News &
Read more

Amateur Radio Bicycle Mobile Setup. Post #1554.

Image
If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=2zWb-KnkGdY. Here's a way to use Amatuer/Ham Radio while you work on shedding a few pounds in useful exercise.  Why not equip your bicycle for 2 meter/70 cm mobile operation? In this short, well-made video, "taverned" shows us how he used a mag mount antenna, a simple C clamp, and a basic ground system to convert his mountain bike into a mobile station.  The project is straight forward, simple, and gives you emergency communications while you peddle down the road. For the latest Amateur/Ham Radio news and information, please visit these websites: http://www.HawaiiARRL.info. http://www.arrl.org. http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon). https://hamradiohawaii.wordpress.com. https://bigislandarrlnews.com. https://amateurradionewsinformation.com (Amateur Radio News & Information).
Read more