[HCDX]: HF Spectrum Study #5 now available from the EDXP!

[Bob Padula <BPadula@xxxxxxxxxxxxxx>]

Dear Radio Monitoring Colleague,

I am pleased to advise that the "HIGH FREQUENCY SPECTRUM STUDY #5"  is now
available from the Electronic DX Press.

This Study is a nine-page A4 booklet, summarising the results of the 1998
coordinated monitoring project by several Australian DXing hobbyists.

The Study was made in June 1998, during the Australian mid-winter period,
corresponding to a yearly smoothed sunspot number of 60, during the
ascending phase of Sunspot Cycle #23.

The purpose of the Study was to monitor and document actual reception of HF
broadcasting stations operating in the frequency range 2300-9999 kHz
between 0000 and 0400 UTC, corresponding to local time here in eastern
Australia of 10am to 2pm. The Study concentrated on commercial broadcasting
stations - amateur and utility broadcasters were excluded.

Each winter, extraordinary midday reception is observed during eastern
Australia on frequencies as low as 6 MHz from all continents, over
transmission paths of up to 30,000 km! This reception is locally known as
the "Antarctic Mode", due to many signal paths crossing the Antarctic
region; the precise propagation mechanism is unknown, and has been
vigorously debated for some 30 years!

The 1998 Midwinter Study resulted in several hundred entries, and shows
transmitter country, organization, site, reception time, and language.

The Study is the 5th in the series. The full listing of studies available
and planned is:

#1 June 1996    (Midwinter Daytime Mode)                14 pages       
4750-7490 kHz   0000-0400 UTC
#2 January 1997 (Midsummer Daytime Mode)                12 pages       
4750-7490 kHz   0000-0500 UTC 
#3 June 1997    (Midwinter Daytime Mode)                12 pages       
4750-7490 kHz   0000-0400 UTC   
#4 January 1998 (Midsummer Daytime Mode) **     11 pages        2500-9999
kHz     0000-0400 UTC
#5 June 1998    (Midwinter Daytime Mode)                 9 pages       
2500-9999 kHz   0000-0400 UTC
#6 January 1999 (Midsummer Daytime Mode) - this study is currently in
progress and will be released during February! (estimated 12 pages)
2500-9999 kHz 0000-0400 UTC

** Note: Study #4 covers reception across all of Australia, with separate
coverage of the Eastern states, and Western Australia

The Midsummer Daytime Mode is the corresponding reception phenomenon which
occurs each summer, where inexplicable reception of stations in all
continents is observed from late morning, aross noon, and into
mid-afternoon, on  frequencies down to 4 MHz, with propagation across
substantially  daylight paths!!

The Studies include discussion on possible propagation mechanisms and
general background information, and will be of value to anyone interested
in HF propagation over long distances.

Hard-copy versions of each study are available for a small charge to cover
costs of printing and mailing:

-    to Australian addresses: A$5 
-    elsewhere via economy airmail: US$5, 5 IRCs, A$8

Payment please by cash, (Aust or US), IRCs, cheques in Australian currency
drawn on Australian banks, GIRO, money orders or postal orders.

Payments should be for the credit of Robert J. Padula.

Available from:

Electronic DX Press,
404 Mont Albert Road,
Surrey Hills,
Victoria 3127,
Australia
Tel/FAX: +61 3 9898 2906
E-mail: bpadula@xxxxxxxxxxxxxx
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