Sandpaper saves the day!.
The rubber shelf liner stuff tends to wobble.
Sandpaper rules.
No answers to your CQs? Then find something to sand!
Key is a J.M. March
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https://www.youtube.com/watch?v=AMYUwlX3ivo
Here is how I assembled a 49:1 impedance ratio transformer for my EFHW.
Correction: Torroid part number is 5952003801
Link to torroid https://www.fair-rite.com/product/toroids-5952003801/
Please join our Facebook Group: https://www.facebook.com/groups/EndFedHalfWaveAntennas/
Newer video https://www.youtube.com/watch?v=BpdpkUEW39o
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https://www.youtube.com/watch?v=sty7RlXQoJI
Typical of this rig. Keying had a twang. I am recording from my IC-7300 via a microphone into a computer. QSO is with a friend who runs the Omni VI Plus.
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https://www.youtube.com/watch?v=JIWE1Tf4uZM