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Contest Techniques - Have We Found Them All ?
Written by Mili   
Tuesday, 20 March 2007

Fortunately, the WRTC 2006 organizing committee was not conservative, and modified the WRTC rules, as used during the previous events. The new, less restrictive rules allowed technical innovations, which under the old rules would not have been allowed. The result was, that not only a team's experience and tactical cleverness was highlighted, but also their ability to use technical knowledge to come up with a good technology concept as part of the contest stategy. This broadened the scope of the WRTC contest and made Brazil more interesting.
Unfortunately, however, the rule changes were officially announced just four months before the WRTC event, which left us with only a short period for developing and producing the large amount of hardware required for the implementation of our ideas.

The door for real innovation was now open

The new rules allowed for two operators, two receivers but only for one transmitter, one PA and one antenna for any given band. What the rules did allow was almost unlimited station automation.

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ROTARY TOWERS
Written by Ranko Boca, 4O3A   
Tuesday, 13 March 2007
Plakat-ringovi-mala

 New product line of heavy duty rotary towers and accessories is something you will buy for life time enjoying.

We offer:
- Rotary towers, from 18m up to 60m high
- Tower sections for fix towers
- Rotary bases with rotators included

- Tower rings
- Ring rotators
- Accessories for towers

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Multiple crystal front end filters board for 40M
Written by Ranko Boca, 4O3A   
Saturday, 24 February 2007
PC-board   40M front end unit with 800Hz narrow Crystal filters for each kHz, from 7011 to 7025 kHz, all controlled from MCU
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Two elements 80M SUPER yagi
Written by Ranko Boca, 4O3A   
Wednesday, 21 February 2007
Na-stubu-malaThese two element yagis for 80M is “shorty eighty’, very well optimized and have specifications almost the same as full size yagi. Forward gain is just slightly lower then full size – about 0.2dB.
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High Power Band Pass HF Filters
Written by Ranko Boca, 4O3A   
Tuesday, 20 February 2007
Filters-in-Brazil-velikaHigh Power Band pass filters for HF are build in two different power levels – HP 1500W and VHP – 5000 W. Decision for having band pass filters after the linear amplifier is simple – on that point filters will reduce wide range noise, as good as all harmonics. Also, with filter in antenna line you simplify filters switching system. Actually, you do not have additional filters switching. They are implementing in antenna lines.
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