Various QRP transceivers
Operator: Onno
QTH: Spain
[email protected]

Barefoot technology and Barefoot power!
Barefoot technology or simple, non-professional radio technology and real Barefoot power or harmless QRP power, that is what you will find here. There are some complex designs but many designs are simple radio amateur circuits. They will never be used professionally!
These simple circuits and rigs can give you much fun: home brewing, portable activities during holidays, etc.
Batteries and inverted V dipole antenna's with a fishing rod as the center support are all you need to make many QSO's.

Much fun!
Barefoot technology and Barefoot power can give you much fun, but is not perfect... There are disadvantages like VXO control instead of a VFO, direct conversion receivers that receive both sidebands and simple frequency displays that are not so easy to read. But working with such simple equipment is often more exciting than working with a much better commercial transceiver.
Perhaps that you cannot believe that you can make many QSO's with QRP power of only 1 watt. Indeed, some practice is needed in the beginning so do not give up too soon. Every boring standard QSO becomes an exciting experience with QRP power!

Minimalistic and simple "Barefoot Technology" and "Barefoot Power""
is all you need to collect a shoe box with QSL cards!

Barefoot Technology!
Experience that you can do much with Barefoot technology and Barefoot power but not everything! But Barefoot technology and Barefoot power is all you need to collect a shoe box with QSL cards and to become an enthousiast radio amateur!



Projects with Python software:

Simple Receivers:

More complex Receivers:

Two old shortwave receivers with the Wadley loop:

Experiments with a passive crystal receiver:

Receivers with tubes:

Simple QRP transmitters:

Simple QRP transceivers for portable use:

QRP Transceivers for in the shack:

Frequency counters for QRP:

Alternative microcontroller DDS and PC shortwave receiver:


Radio communication modes:

Construction, design and testing:



Miguel is very active with home brewing and QRP.
He has a very nice home page that you certainly should visit!
We have almost the same call, only one character difference!

Link to the Homepage of the
Society for Amateur Radio in The Netherlands
PA2OHH member
Link to the Homepage of the
Benelux QRP Club
PA2OHH member 110
Link to the Homepage of the
PA2OHH member 582

Solar X-rays:

Geomagnetic Field: