DUBUS

DUBUS is the international bilingual, english and german, written magazine for Ham-Radio on VHF/UHF and Microwaves. The magazine is published quarterly in March, June, September and December. Each issue of over 100 pages, in A5, is devoted to a mix of state-of-the-art technical articles and DX operating news. National DUBUS representatives are in Austria, Australia, Belgium, Bulgaria, Canada, Czech Rep., Denmark, Eire, France, Finland, Greece, Italy, Japan, Netherlands, New Zealand, Norway, Portugal, Poland, Romania, Russia, Rep. of South Africa, Slovenia, Spain, Sweden, Switzerland, Ukraine, United Kingdom, USA.

DUBUS 2-2026 Vol-55

Editorial.
A Portable Collapsible 2.5m Dish for 23cm & 13cm Tropo and EME
by Giorgio Murador, IK3GHY
The idea was to realize a dish capable of providing adeguate gain for both terrestrial weak-signal work and EME activity on the 23 cm and 13 cm bands, while still being easily transportable and quick to deploy in the field ... ... [Design approach | Mechanical realization | Portability | Evaluation].
Impact of Feed Support Configurations on Aperture Efficiency and G/Ta in Prime-Focus Reflectors
by Rastislav Galuscak, OM6AA, and Pavel Hazdra, OK1HEV
We have regularly published information on feeders for parabolic antennas. With recent advances in computational technology, we are now able to perform a complete calculation for an entire parabolic antenna including blockage losses from feeders and struts. This article deals with strut losses in antennas for EME operation and presents findings using present-day, enhanced, computational techniques ... [Setup | Evaluation | G/Ta curves].
Measuring Antennas in my Sitting Room
by Joachim Koppen, DF3GJ
The radiation pattern is essential for the understanding of how well the transmitter or received power is concentrated into the antenna's main beam, and to what extent interference can reach it from other directions. Measurements of the pattern by having both transmitting and receiving antennas inside a restricted space are perturbed by radio waves that are reflected at the walls, flor, ceiling and any objects inside the room. We can overcome ... [Radio waves inside a room | Standard antennas | Example antenna | Measurements].
Sporadic-E Summer 2025 . 144 MHz
by Joachim Kraft, DL8HCZ/CT1HZE
73 hotspot maps ... [Europe | North America | Australia and New zealand | Asia and Far East].
A Study of 14 MHz WSPR Spots decoded via Aircraft Scatter
by Gwyn Griffiths, G3ZIL
Using a finite difference grid model that combines error metrics between observed Doppler shift and rate of change of Doppler shift for decoded WSPR spots at 14 MHz and a priori speed, height and course estimates for candidate aircraft this article shows that ... [Aims and whether achieved | Operating conditions and methods | Example screen captures | Analysis].
First ever EME QSO on 76 GHz
by Sergei, RW31bp, and Manfred, DL7YC
Microwave North America.
Microwave Japan.
Microwave Spain.
Microwave Italy.
Microwave UK.
Tropo Reports.
Aurora News.
News & Comments
Contest, Expeditions, Beacons update, Comments, Classified Ads.