Terminated End Fed Vee Antenna (TEFV)
Terminated End Fed Vee Antenna (TEFV) Author : D.Prabakaran VU3DXR Figure1 – Terminated End Fed Vee antenna It is a…
Category: DIY
Circuits – Simple Crystal Tester
Simple Crystal tester – The idea for this crystal tester circuit sprung out of the need of testing a large…
Circuits – 40M tag QRP Transmitter
Here is another qrp cw transmitter pulled out from SPRAT back issues, which is simple to build with commonly available…
Antenna – Rockloop HF Antenna for 10,15,20 metre ham bands
Rockloop HF antenna for 10,15,20 metre ham bands The Rockloop HF Antenna ‘s a tuned loop antenna measuring 33 feet…
Circuit – FM Bandstop Filter for RTL SDR
FM Bandstop Filter for RTL SDR The given FM band stop filter is nothing more than a simple Band stop…
Circuits – Simple zener diode tester
Simple zener diode tester Ever found yourself with a handful of zener diodes, wondering if they’re still good or what…
DIY – Making printed circuit boards
Making printed circuit boards There are many ways to produce your own printed circuit boards. Small boards for DC switching…
Circuits – Offset tuning indicator for CW
An NE567 tone decoder, tuned to the transceiver`s CW offset frequency, ensures that the transceiver will be transmitting on the…
DIY – 137 Mhz V-dipole antenna for weather satellites reception
DIY – 137 Mhz V-dipole antenna for weather satellites reception D.Prabakaran VU3DXR A V-dipole for NOAA weather satellites on 137…
Circuits – White LED Torch
This white led torch circuit provides an effective solution for powering white LEDs. It is ideal for flashlights, emergency lighting,…