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

After aquiring an HF signal generator, a used HP 8647A, I started to do some testing regarding the precision of the RF powermeter.

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Kategorie: RF Powermeter

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:

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Kategorie: RF Powermeter

In the German QRPForum someone mentioned a group of QPR enthusiasts QRPGuys. They have some neat QRP kits - transceivers as well as antenna-tuners.

I gave these kits a try: QRPGuys Portable Tri-Band Vertical Antenna and the QRPGuys 40m-10m UnUnTenna Plus   

This post deals with the first one - the QRPGuys Portable Tri-Band Vertical Antenna.

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Kategorie: Antennen

FM bandstop

RF preamp

 

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Kategorie: SDR

Some years ago I had wxtoimg running on a Windows machine and receiving NOAA images automatically with an analogue receiver.

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Kategorie: SDR

Initial steps to setup Grafana on Raspberry3 Debian Strech

 

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Kategorie: IoT Internet of Things

Automated Backup of DB

 Simple full backup complete IOT database

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Kategorie: IoT Internet of Things

Data aggregation

Here the first step to automated data aggregation of sensor data ...

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Kategorie: IoT Internet of Things

Logbook for basic setup of InfluxDB 1.02 on Raspberry Pi 3

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Kategorie: IoT Internet of Things

Logbook for basic setup of NodeRED on Raspberry Pi 3 

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Kategorie: IoT Internet of Things

Logbook for basic setup of Raspberry Pi 3

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Kategorie: IoT Internet of Things

01 01 2018 11 04 47

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Kategorie: IoT Internet of Things

I was able to get a used 40dB power attenuator from a fellow ham. It is a 250W version in a very good condition. The attenuator should be usable up to 6GHz.

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Kategorie: Measuring Technology

I've bought a cheap chinese DC-block on eBay for my spectrum analyser.

Here some measurements using the miniVNAtiny with vna/J:

SMA DC Block Detailed

 

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Kategorie: Measuring Technology

I've bought some 30dB SMA pads from Huber&Suhner. 

Here some measurements using the miniVNAtiny with vna/J:

HuberSuhnerSMA30dB Detailed

 

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Kategorie: Measuring Technology

Here I've collected some configuration stuff for my KiwiSDR.

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Kategorie: SDR

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.

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Kategorie: WSPR

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.

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Kategorie: For sale / Zu verkaufen

 

Here are the first pictures of my KiwiSDR setup ...

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Kategorie: SDR

I've finished my second U3s.

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Kategorie: WSPR

Check out my new KiwiSDR running:

 

http://dl2sba.ddns.net:8073

 

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Kategorie: SDR

Here are some technical details for my KiwiSDR setup ...

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Kategorie: SDR

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 :-/

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Kategorie: WSPR

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.

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Kategorie: RF Powermeter

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:

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Kategorie: RF Powermeter

My current working conditions for SOTA are:

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Kategorie: SOTA

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.

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Kategorie: hamware

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.

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Kategorie: RF Powermeter

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.

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Kategorie: Power supply

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: ATT The tap is based on the work of OZ2CPU.

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Kategorie: WSPR

2014 CW (Morse Telegraphy) was added to the German Nationwide Inventory of Intangible Cultural Heritage.

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