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Field testing a simple 433.92MHz band monitoring receiver.

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Published on Jul 10, 2010

Field testing of a Keymark/SpiritOn RXB1 based 433.92 MHz monitoring receiver. Audio is simply heard via a piezo sounder, while an undocumented (!) RSSI signal strength tap allows proximity & transmitter direction finding. A PICAXE 08M keying a companion 433.92MHz transmitter makes a convenient sender.

Ranges unobstructed ~100m with simple (¼ wave) whip antenna , falling to ~50m thru' light vegetation and buildings. However a "cotanga" Yagi beam can extend LOS ranges to well over ½ km, with good direction finding.. Note- at the hillside testing site, considerable UHF "noise" was apparent from Wellington city 10km away cross harbour!

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