AMRAD Meeting Reminder - Thursday June 13

[Karl W4KRL]

AMRAD will host two speakers this Thursday at 7:30 pm in the Dolley Madison
Library 1244 Oak Ridge Avenue McLean, VA 22101: André Kesteloot, N4ICK and
Terry McCarty, WA5NTI. Each will highlight technical and operational
features of different low speed, narrow bandwidth modes.

Terry McCarty, WA5NTI, will make a presentation on The JT65 Weak Signal
Digital Soundcard Mode. JT65 can decode signals many decibels below the
noise floor making an exception to the old rule “if you can’t hear them, you
can’t work them.” Terry has racked up an impressive list of contacts on
nearly every band. The mode was developed by Joe Taylor, K1JT as an offshoot
to his WSJT weak signal mode widely used in moonbounce contacts. Although
JT65 was originally intended for troposcatter and Earth-Moon-Earth paths,
Terry is one of the pioneers in using it for low power HF contacts. Terry
will tell us where to get the free software, how to configure it, and what
you can expect in a contact.

André Kesteloot, N4ICK will present An Arduino-based DFCW Beacon for the 479
KHz Band. André will discuss Dual Frequency CW (DFCW), a technique where a
CW signal is transmitted at a very slow symbol rate, typically at speeds
from 1 to 80 seconds per dot. This allows reception in very narrow
bandwidths. (See http://www.g4jnt.com/DFCW.htm) He will demonstrate his
design of an Arduino-based 479 kHz DFCW beacon and will update us on the
ARRL petition to the FCC Office of Engineering and Technology regarding this
new band. André will expand on the eventual possibility of "crossing the
Pond" to communicate with British Hams who have been experimenting for a
while with this new allocation.

http://amrad.org/DFCW_Arduino-based_beacon_for_479kHz.jpg

Arduino-based beacon for 479 kHz by André, N4ICK

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