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RF Powermeter - Unstable readings

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.

RF Powermeter Zuletzt aktualisiert: 08. Juli 2017
Weiterlesen: RF Powermeter - Unstable readings

RF Powermeter - Firmware 1.7.1

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.

RF Powermeter Zuletzt aktualisiert: 08. Juli 2017
Weiterlesen: RF Powermeter - Firmware 1.7.1

RF Powermeter - Firmware 1.5.0

I've added a new feature to the firmware release 1.5.0 V1.5 1 - power offset V1.5 3.

RF Powermeter Zuletzt aktualisiert: 08. Juli 2017
Weiterlesen: RF Powermeter - Firmware 1.5.0

RF Powermeter - Adopted Nextion library

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.

RF Powermeter Zuletzt aktualisiert: 08. Juli 2017
Weiterlesen: RF Powermeter - Adopted Nextion library

RF Powermeter - Precision

As described here, I've build an RF Powermeter.

The basic firmware is now running. So I started analysing the accuracy of the used meter head.PowerDev

RF Powermeter Zuletzt aktualisiert: 08. Juli 2017
Weiterlesen: RF Powermeter - Precision

SOTA - Flight deck for KX3

Inspired by the work of Richard G3CWI from SOTABEAMS and his flight decks for some QRP transceivers, I decided to build a matching one for my ELECRAFT KX3.

DSCF4266

Starting point was a clipboard which can be found for some bucks at AMAZON. In the lower section, I can simply secure my log sheets with the strong clip.

SOTA Zuletzt aktualisiert: 29. Juni 2017
Weiterlesen: SOTA - Flight deck for KX3

SOTA - DM/BW-094 - Kornberg

My second SOTA activation is done. Monika (DL6SCF) and I made a short hiking trip on the Swabian Alps. On top of the Kornberg we made a stop and started the activation ... unfortunately we have to shut down operation due to a rising thunderstorm.

SOTA Zuletzt aktualisiert: 29. Juni 2017
Weiterlesen: SOTA - DM/BW-094 - Kornberg

SOTA - DM/BM-344 - Kleiner Kulm - My first activation is done

During a business trip, I took the chance to activate a mountain in the Bavarian low mountains - Kleiner Kulm.

SOTA Zuletzt aktualisiert: 29. Juni 2017
Weiterlesen: SOTA - DM/BM-344 - Kleiner Kulm - My first activation is done

SOTA - Working conditions

My current working conditions for SOTA are:

  • ELECRAFT KX3. With its build in antenna tuner it does a quite remarkable job.
  • For the power I use a LiFePO4 battery with 12V 6,6Ah with a build in BMS.
  • Microphone for the SSB contacts is the stock-mike from ELECRAFT.
  • For CW I use the Palm Pico Paddle.
  • Antenna is a HYENDFED 3-band antenna.
  • Flight-Deck for KX3
  • A 10m fibre pole from DX-Wire - MINI
  • Some velcro-straps
SOTA Zuletzt aktualisiert: 29. Juni 2017

Switch-mode DC-DC converter

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.

Power supply Zuletzt aktualisiert: 16. April 2017
Weiterlesen: Switch-mode DC-DC converter

Frog Sounds - Spurious emissions

I've checked this extremly simple concept for spurious emissions and whether they're compliant with the current regulations ...

QRP Zuletzt aktualisiert: 19. März 2017
Weiterlesen: Frog Sounds - Spurious emissions

Frog sounds - The frog has arrived

Yesterday I've build the FROG SOUNDS 40m CW QRP transceiver.

I've ordered it as a kit from eBay Seller for about €10,- inclusive shipping to DL. The kit arrived well packed after about 15 days in my postbox.

QRP Zuletzt aktualisiert: 19. März 2017
Weiterlesen: Frog sounds - The frog has arrived

Frog sounds - How far can you hear a frog croak?

Currently I've done 6 QSOs with the Frog and my dipole antenna.

QRP Zuletzt aktualisiert: 19. März 2017
Weiterlesen: Frog sounds - How far can you hear a frog croak?

Frog Sounds - Enhancements to the Frog

In 2015 I've build the Frog Sounds QRP transceiver.

This little transceiver still needs improvement:

  1. The output is still only 400mW
  2. The key-click is horrible - even with the additional audio cw-filter.
  3. The suppresion of harmonics is very bad. Check below.

If someone has any ideas how to fix this, please Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein!.

QRP Zuletzt aktualisiert: 19. März 2017
Weiterlesen: Frog Sounds - Enhancements to the Frog

Miss Mosquita - a new girl in town

Since last weekend a new QRP transceiver joined my shack V1 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.

QRP Zuletzt aktualisiert: 19. März 2017
Weiterlesen: Miss Mosquita - a new girl in town

WSPR live data

  Live data from my WSPR feed

WSPR Zuletzt aktualisiert: 04. März 2017
Weiterlesen: WSPR live data

WSPR some data

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.

WSPR Zuletzt aktualisiert: 01. März 2017
Weiterlesen: WSPR some data

RF detectors

I've done some measurements on two RF detectors - one on an older diode detector from ELDITEST Elditest 1 and another one on an AD8307 based one SV1AFN from SV1AFN.

Measuring Technology Zuletzt aktualisiert: 10. Februar 2017
Weiterlesen: RF detectors

WSPR first data analysis

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!

WSPR Zuletzt aktualisiert: 09. Februar 2017
Weiterlesen: WSPR first data analysis

WSPR data collector

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 Wspr V3

WSPR Zuletzt aktualisiert: 09. Februar 2017
Weiterlesen: WSPR data collector
  1. PiAware
  2. vna/J ist umgezogen
  3. vna/J moved to a new location
  4. Reflash Arduino UNO ATMEGA16U2
  5. IoT Powersensor #2
  6. IoT Powersensor #1
  7. Arduino Library for AD7887
  8. RF Duinode
  9. ADS-B Filter
  10. IoT System management
  11. IoT MQTT Infrastructure
  12. IoT MQTT configuration
  13. ELECRAFT K-POD
  14. Rotator control with a NodeMCU runs stable
  15. Detailed measurement on audio CW-filter
  16. Audio CW-Filter finished
  17. Rotator control and the NodeMCU - a proof of concept
  18. Wanderungen/Ausflüge
  19. CW-Sensor-Keyer
  20. IoT Lightsensor
  21. Worked all Germany contest 2015
  22. ELECRAFT K2 - Fixing VFO ALC issue
  23. XPhase - Interference reduction
  24. LF-Converter
  25. SMD Solder Station
  26. Connecting an Arduino to MOSQUITTO
  27. Getting started with MOSQUITTO
  28. Getting started with 2lemetry
  29. Neuer DARC Image Film
  30. nanoKeyer - neue Frontplatte
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DL2SBA
  • Home
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