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...
HAM Radio site Blog
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....
W3LPL Beverage Antenna Construction
I (W3LPL) use separate phased Beverage arrays on 160M, 80M and 40M. If u plan to use a simple beverage ant, as opposed to phased beverages, u can certainly use a 580′ ant on...
End-fed antenna for QRP portable ops
Some friends and I have been talking about dong a camping trip, and I decided this would be a good opportunity to try some portable ops with an end-fed half wave antenna. I’ve been...
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...
Comet GP-15 (6M, 2M, & 440 Band Antenna)
Average price is $170.00 to $200.00 The Comet GP-15 is a pretty cool antenna that really delivers. The GP-15 covers 6 meters, 2 meters, and the 440 band. It uses a very simple design...
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...
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