ARRL

W1VT

Joined: Sat, Apr 4th 1998, 00:00 Roles: N/A Moderates: N/A

Latest Topics

Topic Created Posts Views Last Activity
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
Italian Phishing emails! Dec 13th 2011, 14:20 1 1,821 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 1,674 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 2,844 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 1,933 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 1,778 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 2,418 on 13/9/11
Designing a ham bench Aug 29th 2011, 12:38 2 2,861 on 29/8/11
Can't find recent Hint and Kink Aug 26th 2011, 13:01 1 2,467 on 26/8/11

Latest Posts

Topic Author Posted On
Mosley TA-33 K3CDQ 17 hours, 2 minutes ago
www.mosley-electronics.com/pdf/checkingtraps.pdf

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.

http://sound.westhost.com/project100.htm
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

http://g3jvl.com/programPages/loopQuad.php
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
http://forums.qrz.com/index.php?threads/kenwood-ts-450s-ultra-bright-display.366743/
Plated antenna elements WA1DF 1 week, 3 days ago

http://www.ansys.com/Products/Electronics/ANSYS-HFSS
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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