Home

Hamradio and more

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.

Details: Kategorie: 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.

Details: Kategorie: 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

Details: Kategorie: 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.

Details: Kategorie: 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 ...

Details: Kategorie: 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.

Details: Kategorie: 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.

Details: Kategorie: 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:

The output is still only 400mW
The key-click is horrible - even with the additional audio cw-filter.
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!.

Details: Kategorie: 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 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.