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Rotator control and the NodeMCU - a proof of concept

Basics

Inspired from the work of EA4TX and K3NG I decided to check, whether the ESP8266 based NodeMCU 1.0 (ESP-12E) is usable as a simple remote IP-based rotator control. You can get the NodeMCU in a decent quality on eBay.

Idea was, to link a local emulated serial port to the NodeMCU module. The HAM Radio applications are communicating via the standard Yaesu GS232A protocol with the emulated serial port.  This emulated serial port then forwards the serial requests to the NodeMCU.

Shack Zuletzt aktualisiert: 25. März 2023
Weiterlesen: Rotator control and the NodeMCU - a proof of concept

hamware AT-502/AT-515/AT-615B Interface

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

hamware Zuletzt aktualisiert: 18. März 2023
Weiterlesen: hamware AT-502/AT-515/AT-615B Interface

RF Powermeter - Calibration basics ** updated **

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.

RF Powermeter Zuletzt aktualisiert: 06. März 2023
Weiterlesen: RF Powermeter - Calibration basics ** updated **

Common mode filter/ Balun (DK2DB version)

Some quick measurements on a DK2DB balun.

Antennen Zuletzt aktualisiert: 21. Januar 2023
Weiterlesen: Common mode filter/ Balun (DK2DB version)

hamware AT-615B Firmware

New firmware for hamware AT-615B

I've developed firmware version supporting the AT-615B tuners from hamware.

You can find information in the manual for the AT-615B, which is identical in terms of usage.

Parts are available at cost price. Please check here.

hamware Zuletzt aktualisiert: 05. Januar 2023

EFHW Balun

Based on the work of Jan, DJ1JAN I've build some QRP-1:49 UNUNs.

My first experiences with this board on 20m using a FT82-44 core are, that the core gets hot at 5W on 20m / 14MHz.

Based on this experience I consulted the mini Ringkernrechner and and did some calculations. As far as I understand, the primary coil with 3 turns limits the maximum usable power.

Antennen Zuletzt aktualisiert: 11. Dezember 2022
Weiterlesen: EFHW Balun

IoT - Reading water meters

Browsing the internet, I stumbled over an interesting video on YouTube were a guy shows a very cheap ESP32+camera solution to read the analog readout of water meters.

The software was developed by JomJol and provided on his Github repository. All you have to do is to buy an ESP32+camera module, flash the firmware und the SD-Card and then the water meter is read.

IoT Internet of Things Zuletzt aktualisiert: 04. September 2022
Weiterlesen: IoT - Reading water meters

SARCNet MK1::Home brew version

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

Satellite Zuletzt aktualisiert: 03. September 2022
Weiterlesen: SARCNet MK1::Home brew version

QO-100 - 2021 base-station

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.

Satellite Zuletzt aktualisiert: 18. Juli 2022
Weiterlesen: QO-100 - 2021 base-station

QO-100 - IceConeFeed v2

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

Satellite Zuletzt aktualisiert: 09. Juli 2022
Weiterlesen: QO-100 - IceConeFeed v2

QO-100 - Audio & CW console

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.

Satellite Zuletzt aktualisiert: 16. Juni 2022
Weiterlesen: QO-100 - Audio & CW console

QO-100 - PA protection

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

Satellite Zuletzt aktualisiert: 16. Juni 2022
Weiterlesen: QO-100 - PA protection

QO-100 - 2019 setup

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

Satellite Zuletzt aktualisiert: 16. Juni 2022
Weiterlesen: QO-100 - 2019 setup

QO-100 - WLAN Grid antenna

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

Satellite Zuletzt aktualisiert: 16. Juni 2022
Weiterlesen: QO-100 - WLAN Grid antenna

QO-100 - new pre-amplifier

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.

Satellite Zuletzt aktualisiert: 16. Juni 2022
Weiterlesen: QO-100 - new pre-amplifier

QRPGuys 40m-10m UnUnTenna Plus

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

Antennen Zuletzt aktualisiert: 21. Mai 2022
Weiterlesen: QRPGuys 40m-10m UnUnTenna Plus

QRPGuys Tri-Band Vertical Antenna

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

Antennen Zuletzt aktualisiert: 21. Mai 2022
Weiterlesen: QRPGuys Tri-Band Vertical Antenna

SDR-stick and RTL_433 - 5 days of monitoring

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

SDR Zuletzt aktualisiert: 21. Mai 2022
Weiterlesen: SDR-stick and RTL_433 - 5 days of monitoring

SDR-stick and RTL_433 or how to monitor road traffic

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.

SDR Zuletzt aktualisiert: 21. Mai 2022
Weiterlesen: SDR-stick and RTL_433 or how to monitor road traffic

CW-Sensor-Keyer reloaded

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.

Shack Zuletzt aktualisiert: 21. Mai 2022
Weiterlesen: CW-Sensor-Keyer reloaded
  1. QO-100 - RF preamp
  2. hamware AT-502 - Firmware
  3. RF Powermeter - Firmware 1.8.1
  4. RF Powermeter - Firmware 1.9.0
  5. CobWeb
  6. New boy in town - QCX-mini
  7. RF Powermeter - Uploading HMI file
  8. RF Powermeter - Updated display files
  9. SOTA - equipment weight list
  10. Yaesu FT-818 - Modification MIC MH-31
  11. Power usage ...
  12. hamware - FT-991A Unterstützung
  13. 2-tone generator - FA-2-NF etc.
  14. hamware - FT890 Unterstützung
  15. hamware - FTDX-5000 Unterstützung
  16. Sale
  17. IoT - REDIS server as docker@Synlogy
  18. Docker@Syno::Portainer
  19. IoT - Tasmota - TH16
  20. NOAA received @ JN48OQ
  21. IoT - Air quality sensor
  22. Contesting
  23. Bodnar GPSDO - 10MHz Low-Pass Filer
  24. LimeSDR - Housing
  25. LimeSDR - Measurements
  26. JackYack - simple memory morse keyer
  27. SSTV from ISS during February 2019
  28. Docker@Syno::InfluxDB
  29. Raspberry Pi Logbook
  30. Setting up mail on an RPi to an SMTP host
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DL2SBA
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    • Erdbeben
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  • NOAA
  • SDR