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QST Downloads Feb 19th, 16:34 1 228 on 19/2/16
March 2016 QST Compact Multiband Dipole Feb 19th, 15:23 1 289 on 19/2/16
Antenna analyzer vs feedline type Sep 21st 2012, 14:37 1 2,245 on 21/9/12
USB to Serial Port problems--Prolific Drivers Aug 3rd 2012, 18:27 2 2,611 on 26/12/15
Italian Phishing emails! Dec 13th 2011, 14:20 1 1,972 on 13/12/11
John K0GMO needs help designing SS Amp Nov 17th 2011, 15:53 1 1,813 on 17/11/11
1 Farad Capacitor to Eliminate Headlight Flicker? Oct 19th 2011, 13:14 4 3,049 on 9/11/11
History of Relay Rack Dimensions? Oct 17th 2011, 12:58 2 2,087 on 25/10/11
Miswired Selsyn Oct 13th 2011, 17:51 1 1,964 on 13/10/11
Stealth Antenna wire Sep 12th 2011, 12:51 2 2,590 on 13/9/11

Latest Posts

Topic Author Posted On
Foxhunt drones interfering with firefighting KR6MVS 2 hours, 46 minutes ago
Most of the RC systems use a direct sequence spread spectrum technique that may make it hard to track if the signals are weak. But, if you get close enough for strong signals the spread spectrum is less of an issue. There are also some frequency hopping spread spectrum systems.

You may want to consult the Academy of Model Aeronautics--their insurance program is necessary to keep many flying fields open--without it liability issues would close the fields.

One approach may be find someone with the skills to direction find the sources using a rotatable Loop Yagi Antenna and a Spectrum Analyzer. As the video shows, you have all sorts of different RC signals, but an expert may be able to identify them, just like some people can easily identify different birds. But to most people, the little brown birds you see in your background are just a little brown birds.

Zack Lau W1VT
ARRL Senior Lab Engineer
a substitute for Ebonite (for Marconi PS213A) ? WB5AGF 2 days, 5 hours ago
Ebonite is also known generically as hard rubber. It has a temporary sulfur odor when rubbed.
You can buy a hard rubber block on Amazon

Zack Lau W1VT
ARRL Senior Lab Engineer
Tower Planning Time? K6NYB 3 days, 22 hours ago

Switching between Inverted Vees can give you a few more dB of gain, a worthwhile improvement on HF.

A Shortened 40-Meter Four-Element Sloping Dipole Array - OE5
Here's how to build a four-element sloper system for 40-meters on a small city lot ... Though the dipole in this array may not be exactly vertical, the signal i

Zack Lau W1VT
ARRL Senior Lab Engineer
QSL Organizer - MIL Industries - Panorama City, CA - In Business? WA2FTV 1 week ago
QSL Protect sells similar products.
Here are some pages for 3-1/2 by 5-1/2 inch postcards
Hobbymaster sells postcard albums

Zack W1VT
ARRL Senior Lab Engineer
G5RV Antenna Installation AI6OZ 1 week, 2 days ago
The rule of thumb typically given by the Doctor in QST is that the "inverted V" has an effective height of 2/3rds--a 50 ft inverted V is similar to a 35 ft high flat top dipole. For most of us, the higher the better, though some antenna analysis with the High Frequency Terrain Analyzer that comes with the Antenna book may be in order if you can get your antenna up much more than 50 ft--you may find it advantageous to have a lower antenna as well!

Zack W1VT
ARRL Senior Lab Engineer

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