Inspired by the webpage of SARCNet, I decided to build the SARCNet MK1 rotator.
Here the first impression of the unit I've build:
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.
Weiterlesen: SDR-stick and RTL_433 or how to monitor road 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.
I've developed a small interface board for the HAMWARe controller AT-502, AT-515 and AT-651B. This interface boards supports RS232 and CI-V communications and can be directly mounted into the controller chassis.
In this post I describe in details, how you can create the calibration factors for k0 ... k3 based on raw data measured with the power sensor.
Weiterlesen: RF Powermeter - Calibration basics ** updated **
With the firmware version 1.8.1 there are some minor enhancements:
Here are the required files:
With the firmware version 1.9.0 there are some minor enhancements:
Here are the required files:
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:
Ich habe die Firmware für die Hamware Tuner um den Yaesu FT-991A erweitert.
In Verbindung mit den Logbuchprogrammen UCXLog und Swisslog folgt der Tuner automatisch der eingestellten Frequenz.
Nähere Infos sind hier zu finden.
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.
2014 CW (Morse Telegraphy) was added to the German Nationwide Inventory of Intangible Cultural Heritage.
© 2022 Dietmar Krause, DL2SBA