Category Archives: Allgemein

Playing with the bird

April 1st, 2019

As soon, as the narrow band transponder was opened in February, I had my first QSOs via QO-100. Using an MKU LNC 10 in a 80 cm offset dish and my 3 m mesh dish for transmitting, made the first steps very (too) easy.

In the meantime I mentioned, some hams from the Netherlands, experimenting with ADALM-Pluto SDRs had very good results. So I got one too and was amazed of variety of possibilities it offers. So I heard my first beacon on 9 cm and it was easy to produce a signal on 13 cm. Recently I got two broadband LNAs (I will call them “A” and “B”) from China and was curious to see how these can be used as power amplifiers too.

Power SourcePower in mW
Pluto 3
Pluto + LNA "A" 22
Pluto + LNA "B" 30
Pluto +LNA "A" + LNA "B"120

After some power measuring I connected the stuff to a W2IMU feedhorn, mounted on a tripod. No problem at all to find my signal on the NB transponder of QO-100. The estimated EIRP is about 2.4 W and results in a signalstrength of 12 dB.

Addendum: April 10th, 2019

3 mW are enough!

At least I mounted a DJ7GP patch feed with the bare naked Pluto in the focus of my 3 m mesh dish. the 3 mW were enough to produce a solid signal on the NB transponder. In this case I have 6 W EIRP to get 16 dB signal.

Nice surprise

March 13th, 2019

It was a nice and not anymore expected surprise, as the postwoman had a thick envelope for me: An award for the IARU Region 1 UHF/Microwave contest in October 2017. In it´s attractive design it is an enrichment for my collection.

2017, October: 1st in IARU R1 UHF/MW Contest, Single 2,3 GHz

13 cm Beacon GB3MHS now GB3MHZ

June 23rd, 2018

When switching to 13 cm after monitoring GB3MHZ on 23 cm, I heard typical PI4 sound followed by a callsign in CW. So I learned, former GB3MHS changed the callsign to GB3MHZ and is transmitting in PI4 now.

DL65DARC will be QRV on 23 and 13 cm

June 15th, 2015

From Monday, June 22nd to Wednesday, June 24th I will be QRV during the evenings on 23 cm and 13 cm using the special event callsign DL65DARC.
Skeds (aircraft scatter, tropo) are welcome via ON4KST, Facebook or email.

Rig will be a 3 m dish with 150 W on 23 cm and 75 W on 13 cm. The QTH locator is JN49CV. SSB, CW and WSJT modes are suitable. Operation on relays is not intended.

If I find some spare time, I will be QRV on June 25th, 26th and 28th as well.

On Saturday, June 27th, you can meet me in Friedrichshafen.


Back on air again!

January 19th, 2012

After being qrt by family and business reasons for nearly twenty years, I started in July 2011 in activating my irish call sign EI8HH on 50 MHz. Since January 2012 I am qrv again as DJ5AR from my QTH in Mainz.

The way working on the microwave bands has changed. No more CQs for hours and hours, but a fine chat at ON4KSTs server to make skeds on the bands wich provides much more efficiency than the way, we tried to make QSOs twenty years ago. A SDR makes it possible to display a spectrum of the band on the screen in a waterfall diagram. What a huge comfort compared to the old times. So it is no problem anymore to find somebody for a sked on 23 or 13 cm. Soon after setting up the old equipment for 1296 MHz I managed to work a couple of new squares and had my first QSO ever over the alps to Italy. It was amazing to hear the strong signal of IK3GHY with my 1.2 m dish.