Category: Ham Radio

Project status – 3D printed antenna rotator (16/09/2021)

My 3D printed antenna rotator project for ham radio satellites. Status 09/16/2021

Project status – 3D printed antenna rotator (12/09/2021)

This is a short video about the progress of my 3D printed antenna rotator. Unfortunately only in romanian for now, but captions will be created soon.

My friend YO3IJ and his new IC-705

A very short video with my friend Erim Soyhan YO3IJ/TA2IJ and his brand new Icom IC-705. Partly in romanian. There are captions in english for sections in romanian.

Tuzla 2020, Field day

I published on my YouTube channel a video about the ham radio Field Day event at Tuzla, Romania, 2020.

LTSpice simulation of Baofeng UV5R band selector

I was quite busy the other day trying to understand how Baofeng is using RDA1846 transceiver in their products. While analyzing the schematic it struck me the overcomplicated way they do the switch between UHF and VHF. This is an excerpt of the schematic: The entire selector block is made up with discrete components ! …

AD8307 RF Power Meter II — boards from JLPCB

I ordered the boards for this project with JLCPCB in China. This is my first attempt of working with a professional PCB manufacturer and I am extremely pleased by the results.

AD8307 RF Power Meter

My first finished KiCad project is a prototype of a RF Power meter with input attenuation built around an Analog Device AD8307. An excellent tutorial about log amps can be read in March 1999 edition of Analog Dialogue. KiCad PCB: And the 3D rendering of the same PCB: The next step will be PCB ordering, …

TH-D74 BLE or „Bluetooth Low Energy”

Struggling to understand how Universal Unique IDs work (see here) I was wrongly assuming that Core Bluetooth is a framework from Apple that covers all aspects of communication with devices via BT. I was WRONG ! scanForPeripheralsWithServices method and, in general, what I tried to do, for almost a week, is NOT good for my intended …

Using UUIDs and Bluetooth

I did some more steps towards accessing Kenwood TH-D74’s services via bluetooth. I struggled for some time understanding how discovery based on UUIDs work. I was not aware that, for each service profile, there is a standard Universally Unique Identifier (UUID) documented in Bluetooth SIG specs. Specifically for Serial Port Profile (SPP) service, the UUID …

Why unsupported central manager state ?

Several days ago I received a Kenwood TH D74 portable transceiver. Although I have a Yaesu FT60 and some other smaller and unimportant transceivers, I don’t have any transceiver that is APRS capable. What’s more important, this transceiver is BT and USB capable, providing serial communication, which opens some interesting opportunities. Today I opened XCode …