IN3LBQ on the Hühnerspiel (Amthorspitze) - photo by IN3OTD



October, 2019:
A couple of pages about determining unknown ferrite characteristics, a description of my VNA (non-)repair, some measurements on coaxial relays switching times, a power splitters page.

August, 2019:
Added initial pages about a cheap 144 MHz / 28 MHz transverter, a 20 dB directional coupler, a 20 W HF PA, a RD15HVF1 push-pull PA, reorganized the Hermes-Lite pages and added some new data on the Hermes-Lite v2. Small updates to the GPIB disk emulator page, SMA female calkit coefficients and graphs pages.

October, 2017:
Added more measurements on (pseudo-)PIN diodes, a page on diode power detectors and measurements on the N2PK bridge using an alternative transformer.

September, 2016:
As usual, there were lots of updates in the past few months, that were not listed in this News section. Main ones are: characterization of a large number of (pseudo-)PIN diodes and of a wideband RF switch at HF, measurements on common-mode chokes for the HF band, updates to the Hermes-Lite SDR RX characterization.

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.


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.