Want to build a mixer/controller?

The winning entry in the 2004 SA Amateur Radio Trust construction competition can now be downloaded from the Trust's website at www.amateurradio.org.za. Louis de Bruin, ZS5LP, won the competition.

The competition was for the design and construction of an audio mixer/controller capable of connecting several transceivers, audio devices and telephone lines together for net and relay purposes.

The prototype unit was donated to the SARL to facilitate on-the-air activities such as the President's net and other events. The full description, design criteria and circuit diagram can be downloaded from the Trust's web. The files are in Word format and approximately 7 Mb in size. If the file is too large to download, a hard copy can be ordered by sending a self addressed stamped envelope and a small donation to cover printing costs from the Trust.
Write to P O Box 90438, Garsfontein 0042.

The 2005 project is a low power two-band HF CW transceiver for 20 and 40 metres, fully tuneable with an output of at least 10 watts. The design must use locally available components and in kit form must not cost more than R500 excluding the cabinet.

Entries are invited in two stages. First stage is a paper design, which must include full specs and a detailed write-up. Entries for the first stage must be received by the Trust before 31 March 2005. Entries my be mailed to P O Box 90438 Garsfontein 0043 or sent by email to saardt@intekom.co.za

Three entries will be selected which will each receive R1000 for stage two.

Stage two is the building of a proto-type, which must be complete in a cabinet with construction details, circuit diagrams and operating instructions. The completed unit with all its paperwork must be received by 31 May 2005.

The winner of stage 2 will receive an Icom IC-V8 hand-held transceiver sponsored by Multiscource and the two runners up the 2005 ARRL Handbook. More details can be found on www.amateurradio.org.za

Courtesy of The South African Radio League

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