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Latest Topics

Topic Created Posts Views Last Activity
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 1,729 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 1 1,958 on 3/8/12
Italian Phishing emails! Dec 13th 2011, 14:20 1 1,596 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 1,483 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 2,516 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 1,724 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 1,537 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 2,175 on 13/9/11
Designing a ham bench Aug 29th 2011, 12:38 2 2,394 on 29/8/11
Can't find recent Hint and Kink Aug 26th 2011, 13:01 1 2,185 on 26/8/11

Latest Posts

Topic Author Posted On
Local Eoc (in case the web goes down) Round The Block Net Need Dirt Cheap Wireless Microphones! WD6EJN 1 day 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 6 days, 22 hours 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 1 week, 1 day 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
Old guy having problem mixing codes? WD5BPI 1 week, 1 day ago

It depends on the context. If sent as part of a contest exchange that requires a signal report and serial number, there shouldn't be any confusion as to what is being sent. If you are confused, you can ask for a repeat.

It can be useful for the casual participant in a contest to spend some time listening--contest protocols have evolved over time.

Zack W1VT
HF Background Noise KB0CUR 1 week, 1 day ago
Section IV describes finding RFI sources that are often confused with power line noise.

Zack Lau W1VT
ARRL Senior Lab Engineer

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