Luigi Findanno

Electronics technician, Ham IU7MPQ DL7MPQ, RF explorer, weather satellites hunter, guitar enthusiast, @ScuderiaFerrari fan. 🛰️📻🎸

[Luigi Findanno @DL7MPQ_IU7MPQ]

@jacoposimonetta @MarcoFattorini @qnazionale Legare mani e piedi qualcuno e lasciarlo a terra è tortura. In parte hai colto il punto: se necessario, la società ha il dovere di tutelare (ovvero non torturare) anche i "cretini", altrimenti facciamo tabula rasa di chiunque possiamo ritenere inadatto o un peso per la società.

[Luigi Findanno @DL7MPQ_IU7MPQ]

@jacoposimonetta @MarcoFattorini @qnazionale Qualsiasi cosa abbia fatto questo ragazzo, niente può giustificare la tortura che ha subito. Anche se finisci in galera E' INAMMISSIBILE VENIRE TORTURATI DALLE FORZE DELL'ORDINE. Perché risulta così difficile da capire?

[Luigi Findanno @DL7MPQ_IU7MPQ]

#homebrew HF 20m monoband 2xIRF510 amplifier, PS and mechanical works done ✅

[Luigi Findanno @DL7MPQ_IU7MPQ]

@F4JSU Install and connect flrig to the radio, then you can send commands to flrig by xmlrpc. I developed a python app to implement some automation, it works. You just need an xmlrpc library on the programming language you want use.

[Luigi Findanno @DL7MPQ_IU7MPQ]

Home made current sensor. Ingredients: hall sensor 49E, split washer.

[Luigi Findanno @DL7MPQ_IU7MPQ]

@Frank_Petrilli I developed a PCB board from myself and then I bought the component and I assembled it. I should still have some anpopulated boards.

[Luigi Findanno @DL7MPQ_IU7MPQ]

MAX2121 LBAND #downconverter Arduino library on Github. Still raw code but it works. https://t.co/qdP7NxfrgL

[Tomasz SP5LOT @Tomek_SP5LOT]

M17 is a digital radio protocol for data/voice. I have integrated the capability to transmit text, prepared by an encoder - using rpitx, receive it using GNU Radio, and decode it using a decoder created by SP5WWP.
@m17_project @F5OEOEvariste

[Luigi Findanno @DL7MPQ_IU7MPQ]

Here the schematic of 1.3W Class E amplifier tuned for the 20m band in PDF format. Enjoy!!! https://t.co/Rra6w5JtFi

[Luigi Findanno @DL7MPQ_IU7MPQ]

WSPR 20m beacon RPI + homebrew class E 1.3W amp.

[Luigi Findanno @DL7MPQ_IU7MPQ]

Sometimes you have to develop a tool to develop a device. Double/single tone generator for testing and setup SSB TX. ATTINY85 HT9200 TL072 some 0805 SMD on a prototype board and a pinch of code. https://t.co/jSIq26a8v0

[Luigi Findanno @DL7MPQ_IU7MPQ]

Homebrew 20m ssb transceiver, rx works!

[Luigi Findanno @DL7MPQ_IU7MPQ]

Gain voltage vs gain change. Jumping from 2V to 10V the gain range is 2.5db. Measuring from 0V to 2V the gain range is wider but the noise figure gets too worse therefore, I don't consider those relevant data.

[Luigi Findanno @DL7MPQ_IU7MPQ]

Weekend project 20m SSB RTX. Experimenting with a 20m antenna preamp with #smd dual gate mosfet BF998, it looks good. It would be nice to measure the noise figure, do you know some homebrew/cheap way to measure it?

[Luigi Findanno @DL7MPQ_IU7MPQ]

After the output impedance tweaks also the gain is dramatically improved.

[Luigi Findanno @DL7MPQ_IU7MPQ]

20m antenna preamp.After some tweaks, I'm happy with the output impedance.This preamp will be connected to a NE602 that require 1500 ohm.The toroid on the right is needed only to scale the impedance 53.7 times (22:3T) to better adapt the values to the NanoVNA.

[Luigi Findanno @DL7MPQ_IU7MPQ]

Homebrew SSB Transceiver in progress. The ladder filter S21 seems to be perfect, S11 not sure...

[Luigi Findanno @DL7MPQ_IU7MPQ]

@mgraino Thank you! The circuit is based on this project https://t.co/IQggnepi4d I developed a VFO based on Arduino+SI5351 implementing few CAT commands of the TS-480 so I can use Omni-Rig compatible SW to control the VFO and PTT.

[Luigi Findanno @DL7MPQ_IU7MPQ]

Here we go! Receiving FT8 just with a wire out of the window with my homebrew sdr!

[Luigi Findanno @DL7MPQ_IU7MPQ]

Sunday project in progress: homebrew SDR for PC soundcard. RX part is complete but the first test was KO, let's debug. The 30m-20m filter is ok. #NanoVNA #sdr #homebrew #diy