Half Rhombic antenna with counterpoise
The inverted rhombic antenna boasts a distinctive half-rhombic configuration. Its directivity focuses toward the terminated…
Antenna
DIY
audio
Circuits
Circuits – LM386 Audio oscillator
LM386 Audio oscillator This one is excellent application of widely used audio amplifier IC LM386.Its…
Antenna
Articles
DIY
Terminated End Fed Vee Antenna (TEFV)
Terminated End Fed V Antenna (TEFV) - It Is a travelling wave antenna, which has…
Circuits
DIY
Tools
Circuits – Simple Crystal Tester
Simple Crystal tester - The idea for this crystal tester circuit sprung out of the…
Circuits
CW
DIY
Transmitter
Circuits – 40M tag QRP Transmitter
Here is another qrp cw transmitter pulled out from SPRAT back issues, which is simple…
Antenna
Antenna – Foldaway Loop antenna
This loop antenna is based on one published in one of back issues of sprat…
Antenna
DIY
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…
Circuits
CW
HF
QRP
Transmitter
Circuits – Pippin QRP Transmitter
This pippin QRP transmitter is basically a conventional colpitts type crystal oscillator with output taken…
Circuits
Power & Battery
Tools
Circuit – Battery Low Power Indicator
This is a clever Battery low power indicator circuit designed by G3AGX that provides a…
Circuits
CW
QRP
Transmitter
Circuits – 7 Mhz 5 Watts CW Transmitter
The above 7 Mhz 5 Watts CW Transmitter circuit was found in one of back…