This video is about the stuff that goes into the successful design of a trapped antenna. I show what kind of effects the Resonant Frequency, Q and Capacitance Value associated with the traps have on the overall antenna system poerformance.
I show the three most common kinds of traps that are used:
Discrete Inductor & Capacitor
Coaxial
Self-Resonant
I show how to tune your traps.
From some viewers ... I will add more as they trickle in.
do not forget to pay attention to the voltage & current rating of the capacitor.
adjust the L/C ratio so it resonates between the two bands and adjust the antenna to work for both bands. This reduces to voltage that will appear across the traps (and the trap capacitor).
I have provided all the files that you might need plus some extras ... see the links below.
=== PROMISED LINKS ===
Coaxial Trap Calculator Link
www.qsl.net/ve...
Self-Resonant Trap Calculator (spreadsheet)
drive.google.c...
I put it in a ZIP file so Google wouldn't try to open in in Google Sheets.
Self-Resoant Trap Website
squashpractice...
Coil Winding Spreadsheet that I created for myself and use
drive.google.c...
I put it in a ZIP file so Google wouldn't try to open in in Google Sheets.
Time Markers for Your Convenience
----------------------------
00:05 Introductions
01:35 The World of Antennas
02:23 DEFINITION: Antenna Bandwidth
03:32 A Symmetrical Dipole Antenna
03:48 Trapped Antenna Defined
04:15 Traps - the Multiband Magic
04:35 What are Traps???
05:30 What are Traps made of?
05:54 Trap Design Considerations
06:20 Resonant Frequency
06:51 The Experiment
07:20 Observations
07:22 Best SWR
07:28 Bandwidth
07:50 Quality Factor (Q) of the Trap
07:56 Q Defined
09:53 The Experiment
10:20 Observations
10:22 Best SWR
11:01 Bandwidth
11:25 Capacitor Value
11:47 The Experiment
12:27 Observations
12:28 Best SWR
12:38 Bandwidth
13:06 OVERALL
13:45 Types of Traps
13:53 Discrete Inductor & Capacitor
15:02 Coaxial Traps
16:03 Self-Resonant Traps
17:16 Choosing Your Trap Design
18:14 Modeling Requirements
18:44 A Leg Up on Building the Antenna
19:39 How to Tune a Trap
22:41 Final Comments and Toodle-Oots
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