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Contest Techniques - Have We Found Them All ? |
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Written by Mili
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Tuesday, 20 March 2007 |
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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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Read more...
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Written by Ranko Boca, 4O3A
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Tuesday, 13 March 2007 |
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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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Read more...
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Multiple crystal front end filters board for 40M |
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Written by Ranko Boca, 4O3A
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Saturday, 24 February 2007 |
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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 |
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Written by Ranko Boca, 4O3A
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Wednesday, 21 February 2007 |
These 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 |
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Written by Ranko Boca, 4O3A
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Tuesday, 20 February 2007 |
High
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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