ARLA/CLUSTER: Teste de comunicações no Dia das Forças Armadas Americanas

[João Costa > CT1FBF]

Armed Forces Day Crossband Military/Amateur Radio Communications Test is May 13

The US Army, Air Force, Navy, and Coast Guard will sponsor the
traditional military/amateur radio communication tests on Saturday,
May 13 to mark the 66th annual Armed Forces Day (AFD). Armed Forces
Day is May 20, but the AFD Crossband Military-Amateur Radio event will
take place a week earlier in order to avoid schedule conflicts with
those attending Hamvention.

Complete information, including military stations, modes, and
frequencies, is available on the US Army MARS website at,
http://www.usarmymars.org/home/announcements .

The annual celebration is a unique opportunity to test two-way
communication between radio amateurs and military stations (authorized
under Part 97.111 of the Amateur Service rules). It features
traditional military-to-amateur crossband SSB voice, CW, practice
using legacy interoperability waveforms, and the opportunity for
participating hams to utilize more modern military modes, such as
MIL-STD Serial PSK and Automatic Link Establishment (ALE). Military
stations and Amateur Radio stations are authorized to communicate
directly on certain 60-meter interoperability channels - 5,330.5,
5346.5, and 5,371.5 kHz.

These tests give Amateur Radio operators and shortwave listeners a
chance and a challenge to demonstrate individual technical skills and
to receive recognition from the appropriate military radio station.
QSL cards will be available for stations successfully contacting
participating military stations.

The Armed Forces Day message will be transmitted via Military Standard
radioteletype modes (MIL-STD 188-110A/B). Software is available to
demodulate the military serial PSK waveform, and detailed instructions
can be downloaded from, http://www.n2ckh.com/MARS_ALE_FORUM/MSDMT.html
Utilizing this mode with soundcard equipment can be challenging;
review the instructions carefully.

A short practice transmission will be sent at 1930 and 2330 on May 6,
7, 10, and 12 on 13.506.5 MHz USB and 17.443.0 MHz USB.

Military FSK is Baudot at 850 Hz, 75 baud, low mark, and 2000 Hz
center. Most RTTY programs can be set to decode this mode. To achieve
low mark while receiving in USB, select reverse shift.

QSL cards are available for individuals that receive the Armed Forces
Day test message. To receive a card, copy the printed text of the test
message as received from the military station, and include it in your
report. No attempt should be made to correct possible errors.

Stations copying Armed Forces Day messages transmitted from US Army
and US Navy stations and requesting a QSL card, can complete the QSL
report form online at, http://www.usarmymars.org/ . Stations copying
the Armed Forces Day message transmitted from US Air Force stations
and seeking a QSL card should send a request to Armed Forces Day
Celebration, Chief, Air Force MARS, 203 W. Losey St, Scott AFB, IL
62225.

Include a transcript of the received text, time observed, frequency
observed, military station call sign, your full name and Amateur Radio
call sign (if applicable), full mailing address (including ZIP code).

Stations with Automatic Link Establishment (ALE) capability can
contact a military station on specific half duplex crossband channels
established for this purpose. ALE is a selective calling and linking
method utilized by government, military, and amateur radio
communications.

Military stations will scan and receive certain amateur HFLINK ALE
frequencies and transmit on the corresponding military ALE frequency.
Military stations will also transmit ALE station identification
(soundings) on each military frequency at 30- to 90-minute intervals.

Amateur stations may scan military frequencies and monitor the
soundings to build the LQA database or select the channel manually.
Amateur stations will call military stations using ALE selective
calling on one of the paired cross band channels.