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Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 2,041 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 2 2,355 on 26/12/15
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1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 2,844 on 9/11/11
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Latest Posts

Topic Author Posted On
Mosley TA-33 K3CDQ 17 hours, 2 minutes ago

This Mosley document suggests that if 10 and 15 work properly, but not 20, you should instead check the tip element lengths after the 15M traps. Normally, proper 10M operation means the innermost traps work. Proper 10 and 15M operations usually mean that the traps all work.

Zack Lau W1VT
ARRL Senior Lab Engineer
Yaesu FT-2900R Headphone KE0FEN 2 days, 18 hours ago

Plugging headphones in a speaker jack is a bad idea--you could easily damage your hearing and the headphones with power needed to drive a speaker. You are hearing hum because the headphones are too sensitive to be driven by a typical speaker output.

You need to attenuate the signal from the speaker jack.
Here is a simple project to do that.

Zack Lau W1VT
ARRL Senior Lab Engineer
ghz frequency loop yagis WD6EJN 3 days, 5 hours ago
Here is a downloadable program. As I recall, he is the first one to come up with a design that worked well--and called it a Loop Quad rather than a loop Yagi, though hams in the USA would call his design a Loop Yagi.

Zack W1VT
Dim numberes on my TS450 N7LAR 6 days, 15 hours ago
This thread on QRZ may help
Plated antenna elements WA1DF 1 week, 3 days ago
An Introduction to HFSS: Fundamental Principles, Concepts ...
ANSYS makes no warranty of any kind with regard to this material, including, but ... Initially used to model waveguide transitions, HFSS was quickly utilized for ..... the solution space are covered, or coated, by a perfect electric conductor bound-.

There are 3D finite element analysis programs that can model plated or multilayer conductors.

Zack Lau W1VT
ARRL Senior Lab Engineer

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