I stumpled across this intersting post on RTL-SDR.COM talking about monitoring TirePressureMeasurementSystems with a cheap SDR stick and a clever piece of software. The rtl_433 software receives and decodes signals transmitted by tire pressure sensors inside the wheels of modern (I assume at least from the last 10 years) cars.

My initial idea is, that I can monitor the traffic in front of my house - at least traffic of modern cars. As Germany is a car centric country, I expect to catch most of the traffic.

You may have seen my build version of the M0UKD sensor keyer and the Bamatech sensor head. 

As you can see in this post, I've used a simple slide switch to control the power for the sensor keyer. This was a little bit annoying, as you must always check, whether you've turned of the power, when you leave the shack.

As power consumption is not really a big issue - the keyer draws about 2.5mA from two AA-cells. Based on the capacity of an average Energizer Classic AA battery of 1.200mA you will get an on-time of about 300h.

Since many months I've had the idea, to add an electronic switch to the keyer, so it switch of automatically after 15 minutes of idle time.

In search for a suitable pre-amplifier for the SG-Labs PA V3 I was pointed by a fellow ham to this amplifier on Amazon for abt.€17,-

Die Orignal-Firmware des Steuergeräts des HAMWARE Tuners AT-502 hat eine Funktion eingebaut, welche an Hand eines gesendeten Trägers versucht die aktuelle Arbeitsfrequenz zu ermitteln und den dazu passenden Speicher auszuwählen.

Dies funktioniert bei CW relativ gut, im SSB Betrieb ist dieses Verfahren nicht optimal. Der größte Nachteil meiner Ansicht nach ist aber, dass man zuerst einer Träger senden muss, damit die Frequenz eingestellt wird.

With the firmware version 1.8.1 there are some minor enhancements:

• Offset value is displayed on main screen. "O" at the end of the unit is removed
• Waveform display also correct when offset is enabled

Here are the required files:

• Sketch
• NeoNextion library
• AD7881 library
• AD8318 library
• PeakHold library

With the firmware version 1.9.0 there are some minor enhancements:

• Peak-hold works now, when offset is set
• Meter and diagram works in dBm and W mode

Here are the required files:

• Sketch
• AD7887 library
• AD8318 library
• PeakHold library
• NeoNextion library

CobWeb from eBay

Last weekend I've finished my QCX-mini kit for 20m from QRPLabs.

This was a birthday present from my wife and she is very happy, that the QCX-mini now works great ;-) I'm too ...

On Sunday I was able to make three contacts to the US south coast - 5w and a dipole - thats fine.

The Nextion display needs the content defined in the file PowerMeter.HMI. You can either upload it with the Nextion editor via a serial link to the display or you can copy the TFT file to an SD card and put this into the socket on the Nextion display.

I've updated the the display control files to the current Nextion Editor 1.62:

   HMI-file for the editor: here

   TFT-file for direct load to display: here

Comparison between an unmodified MH-31 microphone (dynamic mc) at my FT-818 in SSB and a modified (electret capsule)

All data measured using the ELV Energy Master Profi-2 Energy Master Profi-2:

One of my HAM fellows has build a new 2kW HF amplifier. Together with his SDR ANAN-100 he gets really impressive IM3 values.

This inspires me also to do some measurements on my existing HF transceivers - K3 & KX3. For this I needed a two-tone generator.

Ich habe die Firmware für die Hamware Tuner um den Yaesu FT890 erweitert.

In Verbindung mit dem Logbuchprogramm UCXLog folgt der Tuner automatisch der eingestellten Frequenz.

Nähere Infos sind hier zu finden.

Ich habe die Firmware für die Hamware Tuner um den Yaesu FTDX-5000 erweitert.

In Verbindung mit dem Logbuchprogramm Swisslog folgt der Tuner automatisch der eingestellten Frequenz.

Nähere Infos sind hier zu finden.

I have some stuff for sale. Please contact me by Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein! if you're interested. Prices are negotiable.

Some steps

This is the way I got PORTAINER running on my DS218+

Configuration of SONOFF TH16 module with current TASMOTA FW