Archive - July 2009

Band Pass Filter Update

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Construction of the band pass filters continued today, progress has been slow recently as i needed some more parts (M3 10mm bolts and some M3 nuts), I also had the problem of finding some appropriate coax to use for the internal connections. As luck would have it i have a couple of barely working Wifi antennas that have some nice long leads of very thin coax, it turns out that the coax is RG-174, perfect for my short internal connections on the BPF’s.

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Large 7-Segment Displays

Big 7Segment Displays

My large 7 segment displays have arrived, these are 2.24″ tall and will be eventually be used in couple of large band readouts for the M0XXT contest station.

They are yellow and of the common anode variety. Should look pretty nice once the project is finished. If anyone knows of a suitable enclosure to hold 3 of these plus associated circuitry please let me know.

High Power Stub Filters

For CQ WPX this year i built two sets of high power coax stub filters to allow the M0XXT team to enter as Multi-Single.

These stubs performed reasonably, although there are some improvements i plan on making for the final design to be used in conjunction with the Band Pass Filters already under construction.

Expect a full article on the coax filters soon.

(P.S. Fitting over 80 PL-259’s is not fun)