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COMPRIDA ISLAND ON LF NDB AND TW
BC |
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GG64, State of Sao Paulo, Brazil |
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September, 04 and 05; 2010. |
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FAB: Flavio A. B. Archangelo,
PY2ZX, DE-1103, RGP-3 ferrite LC, 0,56 meter sqr. hexagonal loop; 120, 90,
75, 60 m dipole. |
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LET: Luiz E. Tresso, PY2OC,
ICSW-7600G, 1,15 sqr meter hexagonal loop. |
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Loops designed by Martin Jenny
and built by Luiz Tresso. |
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Thanks to Samuel Cassio helping
on ID, Sarmento Campos and Rocco Controneo for shared their MW DX Camp files. |
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Objectives:
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1 - Explore Low Frequencies (LF)
in the island with larger loop, especially NDB segment; |
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2 - Explore low portion of High
Frequencies (HF) in the island with dipoles, especially BC segments (Tropical
Waves); |
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3 - Stay updated about the area
for future operations. |
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Achieves and discoveries on LF: |
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1 - Seven ITU heard (Paraguay,
Uruguay, Argentina, Chile, Bolivia, Ascencion, South Africa); |
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2 - First real opening to
continental Africa on first period of the sunday evening; |
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3 - Good opening to northwest
(Brazilian states of RO and AC, Bolivia and North Chile); |
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4 - Bad opening to northeast of
Brazil; |
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5 - Scanned all South African
channels but only two heard (OB, LW); |
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6 - Unids around 505 kHz; |
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7 - New ones for the team. |
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Achieves and discoveries on low
HF: |
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1 - 120 meters dipole is
critical; |
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2 - 120 meters had a lot of
intermodulations and harmonics with the system used; |
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3 - Unexpected Mexico, Papua New
Guinea and Tuvalu listenings; |
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4 - Unfortunately Australian
stations were not heard; |
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5 - Many utility activity noted
on digital and SSB modes; |
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6 - Several strong MIL digi
signals: 2815, 3208, 3260, 3280 and 3915 with OHTR or STANAG, 4690 CODAR; |
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7 - Good audio quality of RASD,
some Bolivian and Peruvian stations; |
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8 - Noise around 6 MHz on
sunrise, maybe due grew up time with increase of electrical activity; |
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9 - Very high activity on 80
meters amateur radio band. |
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