Radio-Amateur-Klub der TU Wien

The Radio Amateur Club of the TU Wien was founded in 1983 by Arpad Scholtz (OE1SZW) and the club’s call sign is OE1XTU.

Come by and visit the club’s qrzblog and find out about our most recent ham radio activities.

The Radio Amateur Club supports the academic curriculum at TU Wien through the following courses: “Shortwave Radio Communication” (course 389.030), “Centimeter and Millimeterwaves” (course 389.190), as well as “Antenna Design and Realization” (course 389.104) and also contribute to the introductory course “Orientation ETIT” (course 350.002).

 

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Installing the 40m/80m/160m triple band fan dipole

Since June 2014, the trustee of the club is Christoph Mecklenbräuker (OE1VMC). The other two members of the board are Günther Brauner (OE1UBU) and Gregor Lasser (OE1GLC). The club station is located at the Institute of Telecommunications. Our members share two things: Firstly, they are affiliated with TU Wien (or they were affiliated in the past). Secondly, they share their ham spirit and enthusiasm for ham radio.

Pixie 2 Transceiver
Pixie 2 Transceiver in “EE?” lab tour

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QFH antenna designed/manufactured by EE students

Shortwave Radio Activities

The photos below show the shortwave radio antennas: A SteppIR DB36 Yagi antenna with four motor-controlled elements which is continuously tunable by remote control from 40m and 10m wavelength (left photo). Its construction, function, simulation and first experimental observations are discussed in an Icebird Talk on June 11, 2015 (for English translation, see here). For the 6m band, two fixed-length passive elements are manufactured and mounted. Further, there is a triple band fan dipole in Inverted-V configuration for 160m, 80m, and 40m (right photo, slightly outdated, why?). For shortwave radio (160m-10m) and VHF (6m), we use the FT-2000 transceiver. We operate all transmission modes from traditional CW and SSB, to fully digital.

SteppIR DB36 Yagi Inverted-V 80m/40m
SteppIR DB36 Yagi (4 elements) Fan Dipole in Inverted-V configuration for 80m/40m

 

40m Band Inverted-V
40m Band Inverted-V

80m Band Inverted-V
80m Band Inverted-V

160m Band Z-Dipole
160m Band Z-Dipole

The club station participates regularly with its callsign OE1XTU in the All Austrian Contest 80/40m and Emergency Communication Exercise which takes place on May 01 every year. Also, the club station is honored to serve as one of the Austrian Headquarter stations OE0HQ in the annual IARU-HF World Championship in July.

Link reliability prediction for OE1XTU by VOACAP ONLINE: Detailed band-by-band prediction for Oct. 2017 and SSB with 100 W transmit power.

 

Microwave Radio Activities

Since Spring 2016, the club is also ramping up its activities on the X-band (3cm wavelength) which belongs to the SHF spectrum. The institute of telecommunications holds experimental transmit licenses for X- and V-band radio technology and propagation research (in addition to the regular privileges of the OE1XTU amateur radio license):

Bescheid ( GZ.: BMVIT-630.292/0003-III/PT2/2017 )

Die mit Bescheid vom 27. Jänner 2016, GZ BMVIT-630.292/0001-III/PT2/2016, befristet bis 28. Februar 2017 erteilten Ausnahmebewilligungen zur technischen Erprobung und Untersuchung der Ausbreitungseigenschaften von Zentimeterwellen im Frequenzband 10.368 GHz bis 10.370 GHz für Funkverbindungen im innerstädtischen Raum werden nunmehr bis 28. Februar 2018 […] verlängert. […]

Our current experimental setups are based on a YAESU FT-817 transceiver (generating/receiving 432 MHz intermediate frequency) and a transverter which converts between 432 MHz and 10.368 GHz (by Kuhne electronics). Microwave antennas in use are WR90 waveguide  horn antennas (16 dBi gain) and a 57cm diameter offset feed parabolic dish (max 35 dBi gain). See photos below. Currently, the transmit power is limited to 250 mW.

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Receiving the OE1XGA beacon on 10368.8800 MHz  Prototype transceiver setup for the 3cm band 10.368-10.370 GHz

 

Feed horn for parabolic dish

Pattern measurement
Students designed and manufactured this optimized feed horn for the 57cm diameter commercial dish The students measured the antenna pattern in the shielded anechoic chamber