I've bought some 30dB SMA pads from Huber&Suhner.
Here some measurements using the miniVNAtiny with vna/J:
Here I've collected some configuration stuff for my KiwiSDR.
Today we had a meeting in our local amateur radio club ESSLINGEN P02.The topic for this meeting was WSPR.
Bernd DK9BH was the organizer of this meeting. He has ordered about 10 WSPRlites from SOTABEAMS.
I had the chance, to do same basic measurements on one of the WSPRlite units.
Here are the first pictures of my KiwiSDR setup ...
Here are some technical details for my KiwiSDR setup ...
I've build the original QRP-labs U3S from stock. Means the supplied crystal on the PLL-based synthesiser-board.
This configuration is basically working up to 20m with a lot amount of drift, but you will get many decodes on wsprnet.org. On 6m you can also get spots - once a day :-/
Some times ago, I found for me a solution, how to handle the unstable readings from the ADC. I've described it in this post.
In the meantime, some HAMs also build the RF powermeter based on the work of Makis, SV1AFN and myself. One if these HAMs, PA3AXA Rens, digged a little bit deeper and analysed the problem in detail. Here his description.
With the firmware version 1.8.1 there are some minor enhancements:
Here are the required files:
My current working conditions for SOTA are:
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.
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 used one of these cheap switch-mode DC-DC converters (available on eBay for a few bucks) for my WSPR U3S transmitter. Checking the transmitted signal reveals strong spurious emissions. Hints from the QRPLabs group leads me to the cause - the DC-DC converter. Replacing it with a linear LM317 one solves the problem.
I've read the PA bias study from Hans and tried to tweak the PA of my U3S for optimum harmonics suppression etc. The spectrum is measured using an SIGLENT SSA3021X analyzer. The power is measured using a 40dB tap and a cheap 20w Dummyload from Diamond: The tap is based on the work of OZ2CPU.
With the firmware version 1.8.0 I've introduce the capability to display also the input power in Watt instead of dBm. Simply tap on the unit field on the display to toggle between dBm and Watt.
I've build a simple distribution amplifier for my GPSDO.
In 2015 I've build the Frog Sounds QRP transceiver.
This little transceiver still needs improvement:
If someone has any ideas how to fix this, please Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein!.
Since last weekend a new QRP transceiver joined my shack I bought her used from a German HAM via the QRPFORUM community. The transceiver is one of the older projects from the DL-QRP-AG but still a neat little transceiver. It is still offered in kit-form from QRP-Project in Berlin.
I've checked this extremly simple concept for spurious emissions and whether they're compliant with the current regulations ...
Here you can find the last spots for DL2SBA on each band within the last day and the all time farest spots.
Here some analysis of my recorded spots data with my spot data collector. As of today there are 45.000 spots recorded in my database.
I've introduced with the firmware version 1.7.1 a complexity to this project which may not be suitable to all users.
WIth the firmware version 1.7.2 I've reduced the complexity by removing the remote configuration utilities.
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.
If you are using my powermeter software in conjunction with Maki's module and have a unstable readings or sporadic extrem value changes, this is a problem of the CS pin. It may be a grounding issue - Makis is currently analysing the problem.
I've developed a new firmware for my RF Powermeter. In this firmware, the user can now program for six calibration points the factors for the polynimial regression functions.
Therefor I've developed a JAVA GUI application for downloading these floating point values to the device.
*** CAUTION ***
All stuff described in this post is ONLY running on an Arduino which runs the OptiBoot bootloader. The EEPROM capability of the OptiBoot bootloader is needed for the features of firmware V1.7.1
I described here a way how to flash the OptiBoot loader on an Arduino UNO clone. For this you need an ISP or a second Arduino to act as an ISP.
My WSPR data collector is now running some days and I started with some basic data analysis.
The power on the bands 60m to 20m is about 100mW!
Inspired from some work found on the Internet and the full functionality of my U3S I've build an automatic spot collector. The spot collector pulls every 5 minutes my spots from WSPRnet.org and puts it into a MYSQL database for later analysis. See the schematic for this setup
2014 CW (Morse Telegraphy) was added to the German Nationwide Inventory of Intangible Cultural Heritage.
© 2019 Dietmar Krause, DL2SBA