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Powerbank Talentcell YB1203000-USB

I ordered some days ago a new ZachTek WSPR desktop transmitter for some field tests. This transmitter is powered by 5VDC via a simple USB cable.

ZachTek WSPR

As an avid reader of Tom's K4SWL Blog I've seen HAMs using many times a small powerbank from Talentcell - the YB1203000-USB - which is advertised as a 12V 3.000mAh powerbank.

tc

As can be seen on their website, that the powerbank uses three 18650 LiIon cells. The regular voltage of an LiIon battery is 3.6V - three cells will give 10.8V and not 12V?!

Initally with not further searching on the internet, I ordered the powerbank on eBay, as the specs looked fine on first glance :-/

Shack Zuletzt aktualisiert: 05. Mai 2025
Weiterlesen: Powerbank Talentcell YB1203000-USB

QRP-Transceiver Penntek TR-35

I bought one of the last kits from WA3RNC ... more to come ...

IMG 9478

IMG 9479

 

QRP Zuletzt aktualisiert: 27. April 2025
Weiterlesen: QRP-Transceiver Penntek TR-35

JackYack - simple memory morse keyer

My Mosquita got a new housing as described in this post. As you can see, there is still enough room for a memory morse keyer.

Transceiver Zuletzt aktualisiert: 16. März 2025
Weiterlesen: JackYack - simple memory morse keyer

Sale

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.

For sale / Zu verkaufen Zuletzt aktualisiert: 16. März 2025
Weiterlesen: Sale

Diamond RH770 2m/70cm antenna

Introduction

For my POTA / SOTA activities I searched for a better 2m/70cm antenna for my ICOM ID-52+ compared to the stock antenna.

I've seen many operators using the Diamond RH770 telescopic antenna and I gave it a try:

Antennen Zuletzt aktualisiert: 12. März 2025
Weiterlesen: Diamond RH770 2m/70cm antenna

2m / 70cm diplexer

Starting point

I borrowed a 2m / 70cm diplexer from a fellow HAM to connect my Multiband-2m/70cm-Antenna to my IC-9700. The IC-9700 has a 2m and a separate 70cm port - the antenna a single port - thats why I need the diplexer.   

The diplexer is a german manufactured AUTH EM 702.

 

Antennen Zuletzt aktualisiert: 12. Februar 2025
Weiterlesen: 2m / 70cm diplexer

PicATU20B - IC-705 CAT-Interface

Andreas has already implemented a computer interface for the ICOM CI-V protocol for his antenna tuner.

I have built a Bluetooth interface into my tuner so that you can control the tuner very conveniently via the ICOM IC-705.

Shack Zuletzt aktualisiert: 07. Dezember 2024
Weiterlesen: PicATU20B - IC-705 CAT-Interface

KH1 - Some measurements

I've done some measurements on my KH1 (Serno 00845 FW 1.25)

Basics

Meter - SIGLENT SSA3021X

40dB PAD - Weinschel 58-40-33

 

Transceiver Zuletzt aktualisiert: 18. Oktober 2024
Weiterlesen: KH1 - Some measurements

RF Powermeter - Unstable reading - Reloaded V2

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.

A hint from the German HAM Jens, DL1LEP points to the another solution:

Instead of adding a pull-down or series resistor to the CS line, use a pull-up resistor to +5VDC with 5-10kOhm

 

 

RF Powermeter Zuletzt aktualisiert: 17. Oktober 2024

XPhase - Interference reduction

Some weeks ago I've build a full-featured XPhase for my father, DK1UO. He is sometimes affected by heavy interference from Plasma-TVs or similar scrap

The function of the XPhase is based on the fact that the interfering signal, received by an auxiliary antenna, is added phase-shifted to the signal received from the main antenna. When the phase-shift is more or less 180°, the interfering signal is canceled out.

My XPhase is based on the work of Hanns, DK9NL. A commercial versions can be found here under the name QRM-Eliminator. Google will provide you some futher informations.

Shack Zuletzt aktualisiert: 26. September 2024
Weiterlesen: XPhase - Interference reduction

PicATU20B - Base unit

I wanted to make something again :-)

The result is a symmetrical antenna tuner for KW up to max. 20W. Further details can be found at the inventors web-site, Andreas, DL4JAL:

 

Andreas' preparations are great - the whole circuit worked straight away. At the beginning I thought - uuuuh soldering this much chicken feed - with good solder, lots of light and a head magnifier I managed it quite well.

Now the tuner is ready for its first field use on a symmetrical dipole - I'll report back.

Shack Zuletzt aktualisiert: 08. September 2024
Weiterlesen: PicATU20B - Base unit

SWR-Simulator

A small SWR-Simulator for QRP tests. This tiny unit provides SWR values of 1:1, 2:1 and 3:1.

IMG 9493

QRP Zuletzt aktualisiert: 26. Mai 2024
Weiterlesen: SWR-Simulator

TinySWR

My new TR-35 QRP CW transceiver does not have a build-in tuner nor a build-SWR meter. My search for a very small and simple metering solution led me to the work of Martin, DK3IT.

His complete work can be found on GITHUB for download. As suggested on his site, I've ordered three tiny PCBs via OSHPARK - unbelievable that you can three PCBs including shipment to DL for €2,22.

QRP Zuletzt aktualisiert: 19. Mai 2024
Weiterlesen: TinySWR

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: 06. Januar 2024
Weiterlesen: Rotator control and the NodeMCU - a proof of concept

HARDROCK-50

Intro

I try to fix a HARDROCK-50 amplifier, which a fellow HAM bought second hand but it didn't really work.

Shack Zuletzt aktualisiert: 26. November 2023
Weiterlesen: HARDROCK-50

hamware - FT-991A Unterstützung

Allgemein

Ich habe die Firmware für die Hamware Tuner um den Yaesu FT-991A erweitert.

In Verbindung mit den Logbuchprogrammen UCXLog und Swisslog folgt der Tuner automatisch der eingestellten Frequenz.

Nähere Infos sind hier zu finden.

hamware Zuletzt aktualisiert: 27. August 2023
Weiterlesen: hamware - FT-991A Unterstützung

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: 30. Juni 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
  1. EFHW Balun
  2. IoT - Reading water meters
  3. SARCNet MK1::Home brew version
  4. QO-100 - 2021 base-station
  5. QO-100 - IceConeFeed v2
  6. QO-100 - Audio & CW console
  7. QO-100 - PA protection
  8. QO-100 - 2019 setup
  9. QO-100 - WLAN Grid antenna
  10. QO-100 - new pre-amplifier
  11. QRPGuys 40m-10m UnUnTenna Plus
  12. QRPGuys Tri-Band Vertical Antenna
  13. SDR-stick and RTL_433 - 5 days of monitoring
  14. SDR-stick and RTL_433 or how to monitor road traffic
  15. CW-Sensor-Keyer reloaded
  16. QO-100 - RF preamp
  17. hamware AT-502 - Firmware
  18. RF Powermeter - Firmware 1.8.1
  19. RF Powermeter - Firmware 1.9.0
  20. CobWeb
  21. New boy in town - QCX-mini
  22. RF Powermeter - Uploading HMI file
  23. RF Powermeter - Updated display files
  24. SOTA - equipment weight list
  25. Yaesu FT-818 - Modification MIC MH-31
  26. Power usage ...
  27. 2-tone generator - FA-2-NF etc.
  28. hamware - FT890 Unterstützung
  29. hamware - FTDX-5000 Unterstützung
  30. IoT - REDIS server as docker@Synlogy
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DL2SBA
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