Archive - May 2009

5B4AGN Band Pass Filters – Construction Started

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I started construction of the first of two automatic band pass filters tonight. These will be used in the M0XXT contest station in conjunction with high power stub filters to allow us to run a proper Multi-Single or Multi-Two station.

These are similar to the Dunestar 600 devices, however they use the W3NQN filter design so the performance is superior to the Dunestar’s. They were designed by Bob Henderson 5B4AGN, who had some professional boards and cases made up.

They employ a very clever motherboard system, so the filters can be removed/replaced easily.

The photo is of the first, nearly complete motherboard