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Topic Created Posts Views Last Activity
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 1,736 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 1 1,964 on 3/8/12
Italian Phishing emails! Dec 13th 2011, 14:20 1 1,602 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 1,488 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 2,522 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 1,729 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 1,541 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 2,181 on 13/9/11
Designing a ham bench Aug 29th 2011, 12:38 2 2,404 on 29/8/11
Can't find recent Hint and Kink Aug 26th 2011, 13:01 1 2,194 on 26/8/11

Latest Posts

Topic Author Posted On
BalBal? WB5EMX 16 hours, 41 minutes ago
Here is a page that may provide some ideas.

The high frequency limit of a transformer is often limited by the length of wire used. One can shorten the wire and maintain the low frequency limit by using a core material with a higher permeability--but lower permeability materials typically have lower loss and better high power handling capability.

Zack W1VT
ARRL Senior Lab Engineer
Impedance match KM4AAH 2 days, 9 hours ago
Apr 2010 - QST (Pg. 65)
Adapting Aviation Headsets to Ham Radios
(Hints and Kinks)
Author: Raydo, John, K0IZ
Jul 2003 - QST (Pg. 59)
Aviation Headsets with Amateur Radio Equipment
(Hints and Kinks)
Author: Haynes, Jim, W6JVE
Dec 2003 - QST (Pg. 57)
More on Aviation Headsets (July 2003)
(Hints and Kinks)
Author: Blevins, Ken, K5ALQ

Local Eoc (in case the web goes down) Round The Block Net Need Dirt Cheap Wireless Microphones! WD6EJN 6 days, 22 hours ago
How a TV News Live Truck Works! #StormKING

They use a mast nearly 50 ft tall to get the distance.

Zack W1VT
ARRL Senior Lab Engineer
HF Background Noise KB0CUR 1 week, 6 days ago
You next step is to use direction finding techniques to locate the source. Most of the time power line noise varies with the weather--since yours does not--it may be inside a building and radiated by powerlines.
V. How to Locate Power-Line Noise

Zack W1VT
ARRL Senior Lab Engineer
MFJ-948 Tuner help/problems KA0RSN 2 weeks ago
Is your IC-7200 putting out 30 watts and measuring SWR according to the manual? I'd first do testing on 20M, where the SWR is normally best for a G5RV--and I'd do it without the MFJ in line--run the coax from the antenna straight to the rig.

Once I know that is working, then I'd hook up the MJF--being very careful to use the right connectors on the back panel.

Zack W1VT
ARRL Senior Lab Engineer

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