A73A Multi/Multi from the Desert of Qatar

Tobias Wellnitz, DH1TW Friedrichshafen Tobias@dh1tw.de June 2012

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On my way to Qatar

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On the way to A73A campsite

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Arriving at the campsite

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A73A campsite

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So where is A73A campsite exactly?

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Satellite Image A73A campsite

A73ACampsite

360°

300°

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Strategic Decissions

Some Facts:• Temporary Activity• Directly on the beach (salt water)• Protected Lagoon• No high towers available• 85% QSOs come from direction 300-

360º

Vertical Antennas

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N6BT Bravo Verticals• 2 el vertical parsitic array• Elevated radials• Switchable Reflector/Director• 3 Directions

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A73A Vertical Antenna farm

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2el parasitic vertical array

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2el parasitic vertical array (Refelector)

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2el parasitic vertical array (Director)

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2x 2el vertical phased array

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2x 2el vertical phased array (BIP – 0º)

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2x 2el vertical phased array (BOP – 180º)

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2el vs phased 2x2el vertical array (BIP)

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A73A Antenna setup

10m: 2x 2el N6BT verticals + A4S@15m15m: 2x 2el N6BT verticals20m: 2x 2el N6BT verticals40m: 2x 2el N6BT verticals80m: 4-Square160m: 20m high L-Antenna

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A73A antenna farm

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A73A Antenna farm (A4S)

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A73A Antenna farm 80m 4-Square

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A73A Antenna farm 160m L-Antenna

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Stackmatch II Plus (for BIP & BOP)

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Be aware about low & high tide

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Infrastructure is crucial

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And food as well

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10m & 15m Shack

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20m, 40m, 80m, 160m Shack

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20m, 40m, 80m, 160m Shack

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Equipment & Results

• 5x FT2000 + 1x IC746 Pro III• 4x ACOM2000A, OM3500, Emtron DX2 Band QSOs Zones Countries

160m 340 13 62

80m 1134 27 92

40m 1081 27 101

20m 2280 40 145

15m 2815 40 147

10m 3978 40 161

Total: 11628 187 708

Total score: 29,3 Mio

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Result analysis

Claimed Position

#1 Asia#4 Outside US

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Thanks for all the QSOs!

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Follow me!

Website:www.dh1tw.de

Twitter:DH1TW

Pictures © by: - A71BX- HZ1DG- K5GN

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