In 2015 I've build the Frog Sounds QRP transceiver.
This little transceiver still needs improvement:
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.
Here you can find the last spots for DL2SBA on each band within the last day and the all time farest spots.
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 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.
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
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
The spectrum is measured using an ELAD FDM-S2 receiver.
In case you've bricked the UNO bootloader or even the USB bootloader in the ATMEGA16U2, this may help ...
The original library from Dan is not working as expected for me. So I adopted the code a little bit.
You can find the changes below. You can also download "my version" of the library here. Unzip into the Arduino's library folder.
As described here, I've build an RF Powermeter.
FlightAware ADS-B Filter measured with miniVNAtiny
I've build a simple distribution amplifier for my GPSDO.
I've done some long term measurements on my GPSDO. The GPSDO has a RS232 based simple command interface.
This is my first power/voltage sensor I've build. It is based on an commercially available powermeter from B+G E-Tech. You can find them on eBay or their website. It provides a 90ms pulse for each Wh flown through it.
The line voltage is measured using a simple transformer and a circuit based on the schematic from OpenEnergyMonitor. The software to measure the line voltage is also from OpenEnergyMonitor embedded into my sensor framework.
For the main power distribution in my house, I also build a powersensor. The basic idea is the same as for this sensor. But the electric meter is already build into the distribution cabinet, so this power meter uses the so-called S0 bus of the power meter inside the cabinet.