IN3LBQ on the Hühnerspiel (Amthorspitze) - photo by IN3OTD



January, 2016:
Lots of updates in the past months, here is a brief summary of the main ones: several HF PA drivers added to the RF power amplifiers section, a new page about the Hermes-Lite SDR, updated measurements on the HF Class-A PA.

August, 2015:
Updated the wideband bias tee page with more measurements and some improvements to the previous design.

January, 2015:
A new QRP power amplifier, a Class-A design by WA2EUJ, covering the HF plus the 50 MHz band.
A GPIB disk emulator using a PIC and an SD card to allow old equipment storing data on a modern media.

December, 2014:
Added description of the recently built low-distortion HF push-pull amplifiers and measurements on a high-IP3 HF preamplifier.

June, 2014:
Updated the VNA calibration kit pages, with a new SMA male calkit and a new 50Ω load in the SMA female calkit page.

June, 2014:
Added new LTspice models for the RD06HHF1 and RD16HHF1 LDMOS.

March, 2014:
Updated the VNA homemade calibration standards page with the standards models for the HP 8753C VNA.

December, 2013:
Added the From the bench section, with practical information on bench measurements and current projects.

July, 2013:
New projects in the amateur radio and electronics sections.

January, 2013:
Added some more projects in the electronics section.


External links:


In these pages you will find some material related to my amateur radio activity; IN3OTD is the call sign assigned to my amateur station in Italy.
I hold also the call sign DK1CG in Germany and in the past I held F5VMW in France.
To me, being a ham means mostly experimenting with radio-related electronics circuits and devices and I hope that the material you will find here will be useful also for your projects.



Added several new sections:

Amateur radio projects


Site overview:

There are several (overlapping) sections, where I add new material every now and then, when I find something I think could be of interest also to other hams:

Please don't forget to sign my guestbook!
Update: the guestbook system seems to broken since some time, so the guestbook is currently not available.