Lars Thunberg

This is the homepage of Lars Thunberg in Sollentuna, Sweden. Amateur radio callsign SM0TGU e-mail lars(at)larsthunberg.se
For information about my satellites and amateur radio activity please see this page where most of the info are in english. Also see all the posts about amateur radio or use the web page search .

My linkedin page is http://www.linkedin.com/pub/lars-thunberg/1/442/769

Domänen larsthunberg.se ägs av Lars Thunberg, Sollentuna. Kontakt via e-mail   lars(snabel-a)larsthunberg.se

Om du letar efter ”rätt” Lars Thunberg kan jag nämna att födelseort är Mellösa utanför Flen och födelseår 1972.

För arbetsrelaterade kontakter hänvisar jag till LinkedIn:

Amateur Radio

QO-100 SatRover fixed setup

Final fixed dish setup

This is my final QO-100 fixed setup with the SatRover:

  • SatRover Mk 1 from PE1CKK
  • 2.4 GHz Helix (as a part of SatRover)
  • LNB a part of the SatRover, feed with normal 75 ohms TV cable coax
  • 60 cm dish from Triax (TD64) branded as Canal Digital
  • IC-705 as TRX
  • 10 dB attenuator and a number of meters of Hyperflex 5 coax cable to make the output on 2.4 GHz at the Helix to aprox 100 mW (legal power limit in Sweden)
The SatRover combined 2.4 GHz TX Helix and LNB for 10 GHz RX
First test of fixed installation
Read connections of the SatRover

SatRover and the IC-705
Frequency stability test with an web SDR receiver for full duplex and FT8. Very good!
Amateur Radio

50 MHz Oblong

April 2024 I made a 50 MHz Oblong according to this.

Some pictures from building and mounting on roof:

Amateur Radio

First QO-100 QSO April 2024

Today 12 April 2024 I made my first QO-100 QSOs via FT8 and FT4 with the SatRover transverter in the garden outside our house. I got a small pile-up!

Amateur Radio

First RX test QO-100 with SatRover

The first QO-100 RX test with SatRover and IC-705 the 22 mars 2024. What you see and here is the lower beacon.

Amateur Radio

New GFK glasfiber tube Aug 2023

During August 2023 and removed my old GFK glasfiber tube and replaced with a new one – this one from Funk Elektronik.

Here are some pictures during the 3 hours of work…

First remove the antennas and the old tube:

Then up with the new tube:

Then up with the antennas and support bom for cables. Here are several pictures from different angles:

Amateur Radio

DIY 5 element UHF Yagi of DK7ZB model

For my SatNOGS station I have built a lightweight 5 element UHF Yagi of DK7ZB model according to this 50 ohm version.

Schematics here:

Some construction notes:

Use a good coax connection for the driven dipole. Here I use an old 10 mm dipole from an LFA loop antenna:

I’m using 32 mm PVC pipe and pipe holders for the elements that are 6 mm alu pipes/tubes. The PVC pipe is the 1,8 mm version for water, not the version used for electrical installation.

Finished antenna below. It gives a very good SWR, under 1.3:1 for 10 MHz bandwidth 430 – 440 MHz.

Amateur Radio

3 el UHF lightweight Yagi

This 3 el UHF lightweight Yagi by RA3TOX can be built with low cost materials like 20 mm PVC tube and tube holders as element holders. The element can be made of 3.2 mm aluminium welding rods. Making a second yagi on the same boom and it becomes a X-yagi, with correct made phasing cables.

I have built one X-yagi version and tests on the ground (see picture above) was very good, when I tested it as a SatNOGS antenna. Unfortunately, something broke when I mounted it on the mast so it is not in use.

The driven element (loop type) was kind of hard to get correct, I made several versions before I got the correct SWR for 436 MHz.

This is the drawing I used:

  • Original drawings, calculator and design by RA3TOX
  • Used by PE0SAT for his SatNOGS station. Link here.