Published by the author IT9YBG

PROJECTS

Voice assistant "Amazon ALEXA" ( Italian ) with Raspberry Pi2

Video here
You follow the installation instructions here

Vaisala RS41 radiosonde modification - TX Power 20 dBm -

Transmission in APRS (432.500 Mhz) every 6 minutes

Transmission in RTTY (432.425 Mhz) every 30 seconds

Transmission in CW (432.425 Mhz) every 6 minutes

Call: IT9YBG-11

The modified radio probe. Departure from Cagliari, arrival in Sicily.

After the discovery, the change. 😲

Receive RTTY (Video)

You follow this guide and install DL-FLDIGI from here

TEST antenna 403 Mhz Radiosonde with NanoVNA

You see red line

Cell Phone 3.8V LI-Ion 2100 mAh

It is easy to build, construct and erect a wire dipole antenna for the HF band 40 metres, using a few simple components at a minimal cost and get great results.

Dipole arm length (inverted V 120 °) in meters: 9.993
Frequency in KHz: 7100

..the dipole resonates very well at 21.5 Mhz

L-BAND SATELLITES

Inmarsat owns and operates the world’s most reliable L-band satellite network. Our BGAN, FleetBroadband and SwiftBroadband voice and data and Internet of Things (IoT) machine-to-machine (M2M) services deliver connectivity anywhere. With the arrival of 5G, satellite communications will play an important part in transforming the way we live and work, by extending coverage and new capabilities into the seas, the skies and rural and remote areas to power an always-on global digital society.

GPS patch antenna modification.

RTL-SDR Active L-Band Patch Antenna For Inmarsat / Iridium / GPS

Thank's to a dear friend Gabriele SOMMA

* Reception test *

I noticed that I was touching the RTLSDR I had a slight discomfort, as if a slight tension passed. I connected the ground wire of my electrical system to the dongle and the annoyance went away. I have seen that the RTLSDR heats up much less after about 12 hours of WSPR reception and I get more WSPR transmitting stations. This is just an easy idea. Good reception. 😉

Ho notato che toccavo la RTLSDR con un dito avevo un leggero fastidio, come se passasse una leggera tensione. Ho collegato il filo di massa del mio impianto elettrico al dongle e il fastidio è andato via. Inoltre ho appurato che la RTLSDR riscalda molto meno e, dopo circa 12 ore di ricezione WSPR ricevo più stazioni WSPR trasmittenti. Questa è solo una idea di facile realizzazione. Buona ricezione. 😉

WSPR, reception on 20m - 40m and 30m band tonight with automatic frequency RaspberryPi - RTLSDR V.3 and WSPRD 😋

Antenna assembly for AIS signals and modification of Icom Ic-R7100 receiver discriminator output for use with ShipPlotter software from COAA and 9600 bps data input for decoding ships on the Strait of Messina (Sicily-JM78se) 🚢

Download document

I removed the 1st IF signal from the FT100 before the filter of this IF, at 68.985 MHz, where the band is still very wide, and we connected it to the RTL-SDR, thus obtaining a panoramic receiver, controllable both in HDSDR that FT100 via CAT (under development), and with a flat band higher than 2 MHz as seen in the spectrum in the following figure.

Video here

Homemade low pass filter RTLSDR V3 + test

Netgear DG834v5 ADSL2+ Modem Router Cooling Mod

Use a LG-P990 smartphone as a screen to view WSPR spot databases all day

Radio Frequency measurament with a simple sonda for the digital test

The RF probe is one of the most comfortable accessories you can have in our lab.
Using only 3 electronic components, one can accomplish one of the simplest and cheapest homebrew projects.
What is an RF probe, and how does it work?
One could think of an RF probe as a special tip that converts the radio frequency into normal DC, readable on our digital tester.