Error opening serial port

Encouraged by the latest developments, today I started building a new application that will  allow remote connection to Kenwood TH-D74, remote control and APRS data transfer. However, while building and running the app I got the following error: [debugger]Error opening serial port … Operation not permitted(1).[/debugger] If you encounter this, be aware that it is …
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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 …
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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 …
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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 …
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Kenwood TH-D74

We first met — I think — in the summer of 2015 during the Hamfest in Friedrichshafen. At that time I had a mobile Kenwood transceiver TM-D710 which was quite nice by its own. However, after several months using the TM-D710 I got increasingly annoyed by some of its shortcomings, most of them purely subjective (but I …
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Abandoned Posts

Over the past seven years (the age of this blog) I started writing several articles that I never  finished. It’s time to trash them completely or just add them to a list for future afterthoughts. Who knows ? So, from older to newer: “Weller WD 1000 M Review – Part III – Software”, January 18, 2013 — …
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Beacon with SiLabs module

This is a beacon project started by my friend YO5VAE. He faced some issues while programming of the Si4463-based module and I thought I might give a hand. I resoldered the entire project on an empty Arduino shield to allow expansion of the project with some additional modules. Below are some pics, but probably the …
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Repair of a cassette deck

I twenty dollars for this superb cassette deck. The playback and recording heads were in excellent shape and I used this deck for some years, playing and recording on NOS (new old stock) tapes, mostly chrome type II and metal – type IV, that I purchased on eBay. However, one day the entire head block …
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