ZigZag Antenna of Kharchenko (Calculator)
The updated calculator of Kharchenko Antenna. The antenna is modeled in MMANA program and optimized for Wi-Fi and 3G bands. MAA-model of the ZigZag antenna can be downloaded from our website. The wire in...
Category: Articles
19 Useful Tips For Communicating Before, During & After Disasters
When disaster strikes, you want to be able to communicate by both receiving and distributing information to others. You may need to call 9-1-1 for assistance, locate friends or family, or let loved ones...
Amplifier impedance measurement
Starting with the EMRFD Fig 2.57 amplifier as a base, you can measure input returnloss using a return loss bridge. Return loss can be translated into VSWR and impedance. If the return loss is...
Using Phono Plugs for VHF Measurement Applications
ere is a very clean way of assembling RCA plugs with RG-188 coax cable. These cables are used throughout with my version of the QST spectrum analyzer, which he built exclusively with “ugly” methods....
Calculations and Simulations with Pads and Feedback Amplifiers
One of my favorite circuits uses a bipolar transistor with two forms of negative feedback. One is parallel feedback in the form of a resistance from the output collector back to the input base....
Digital TV for Dummies
There are so many aspects of digital TV to understand. But it’s not that hard to figure out when someone takes the time to explain it. Analog TV Analog TV is what we have...
Audio / Video Introduction
This article will help you understand how the world of audio and video media equipment has changed, and why you don’t have to get that third mortgage on the house to own a top...
Satellite -vs- Cable TV
By David – K3DAV Fans of both satellite and cable TV have been arguing for a long time over which is better. Which provides the better picture and sound? Which provides better high definition...
The Simple Antenna Grounding System by K3DAV
The following three photos are of the new grounding system I built. I installed it on April 1, 2012 in preperation for the two new antennas. The first pic shows the box mounted over...
The Field Day Fiasco
(Author unknown) I remember being really excited for my first Field Day event. I had already gone to a few of the local Amateur Radio club meetings shortly after receiving my license, KF7OOL, and...
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