I started my journey into QO-100 with a very simple setup. Details can be found here. The previous setup consists of the well known LimeSDR-mini, a pre-amp and a modified WiFi-amp. No I placed all the components into an old case - not so fancy but sturdy.

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Kategorie: Satellite

Inspired by the webpage of SARCNet, I decided to build the SARCNet MK1 rotator.

Here the first impression of the unit I've build:IMG 6564

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Kategorie: Satellite

Yesterday the IceConeFeed v2 from Patric - DC8PAT - arrived well-packed and preassembled with the Golden Media 202 LNB.

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Kategorie: Satellite

I started my journey into QO-100 with a very simple setup. Details can be found here. I used purely SDRConsole to receive & transmit audio via a simple USB headset. This was no real comfort and it was not capable transmitting CW ;-) 

Fortunateley Andreas DL4JAL published 2021 in the German ham radio magazin FUNKAMATEUR an interesting hardware console. The basic idea behind this console is, that through the internal soundcard SSB-audio as well CW-audio can be transmitted. A hardware PTT key can used to switch SDRConsole into transmit mode. Furthermore it controls the timing for T/R-switching - SDRConsole has some delay between audio input and rf-output via the LimeSDR-mini - so no loss of last DIT or syllable.

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Kategorie: Satellite

Based on the publication of Matthias, DD1US, I bought from him one of these TMT H3930 isolators - Thanks Matthias for supporting the community!!!

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Kategorie: Satellite

My current setup to operate ES'hail & QO-100.

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Kategorie: Satellite

I received a new WLAN grid antenna from a fellow Ham - thanks for this!

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Kategorie: Satellite

My previously used pre-amplifier (the one in front of the final PA) only delivers a gain of abt. 9dB @2.4GHz. This was far too less for my final PA used.

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Kategorie: Satellite

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   IMG 1495

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Kategorie: Antennen

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: 

TriBand 2

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Kategorie: Antennen

Some days ago I setup a simle RTL-SDR based monitoring station. Now after about 5 days of more or less constant monitoring I found one interesting thing:  

08 04 2022 17 34 07

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Kategorie: SDR

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.

2022 04 03 10 00 03 Window

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.

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Kategorie: SDR

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.

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Kategorie: Shack

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,-

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Kategorie: Satellite

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.

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Kategorie: hamware

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.

DSCF2112 DSCF4106 DSCF4108 DSCF4109 DSCF4112

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Kategorie: hamware

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.

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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

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

CobWeb from eBay

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Kategorie: Antennen

  1. New boy in town - QCX-mini
  2. RF Powermeter - Uploading HMI file
  3. RF Powermeter - Updated display files
  4. SOTA - equipment weight list
  5. Yaesu FT-818 - Modification MIC MH-31
  6. Power usage ...
  7. hamware - FT-991A Unterstützung
  8. 2-tone generator - FA-2-NF etc.
  9. hamware - FT890 Unterstützung
  10. hamware - FTDX-5000 Unterstützung
  11. Sale
  12. IoT - REDIS server as docker@Synlogy
  13. Docker@Syno::Portainer
  14. IoT - Tasmota - TH16
  15. NOAA received @ JN48OQ
  16. IoT - Air quality sensor
  17. Contesting
  18. Bodnar GPSDO - 10MHz Low-Pass Filer
  19. LimeSDR - Housing
  20. LimeSDR - Measurements
  21. JackYack - simple memory morse keyer
  22. SSTV from ISS during February 2019
  23. Docker@Syno::InfluxDB
  24. Raspberry Pi Logbook
  25. Setting up mail on an RPi to an SMTP host
  26. Weather satellites reception - first steps on Linux
  27. IoT - NodeRED - Backup
  28. IoT - Grafana - first steps
  29. IoT - InfluxDB - first steps
  30. IoT - InfluxDB - Setup

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

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