02/10/2016
In the March/April 2016 Issue?
Our QEX authors touch upon several aspects of Amateur Radio - from circuit
behavior, to antenna design, to the directing of energy radiated by antennas.
· Dr. Ulrich L. Rohde, N1UL, shares a detailed mathematical treatment
of the calculation of FM and AM noise signals of Colpitts oscillator circuits.
· Robert J. Zavrel Jr., W7SX, investigates the mechanisms for the
formation of the radiated elevation angle pattern in ground-mounted vertical
antennas.
· Al Christman, K3LC, shows us how to improve the performance of a
quarter-wave radiator by adding parasitic elements to form a
vertically-polarized Yagi array that is contained entirely within the same foot
print as the radiator.
· Elwood Downey, WBOOEW, takes us through the details of a two-axis
satellite tracker that relies entirely on built-in spatial sensors and needs no
prior alignment with respect to the Earth's surface.
QEX is edited by Kazimierz "Kai" Siwiak, KE4PT, (ksiwiak@arrl.org[1]) and is
published bimonthly. QEX is a forum for the free exchange of ideas among
communications experimenters. The content is driven by you, the reader and
prospective author. The subscription rate (6 issues per year) for ARRL members
in the United States is $24. Would you like to write for QEX? We pay $50 per
published page. Get more information and an Author Guide at
www.arrl.org/qex-author-guide[2]. If you prefer postal mail, send a
business-size self-addressed, stamped (US postage) envelope to: QEX Author
Guide, c/o Maty Weinberg, ARRL, 225 Main St, Newington, CT 06111.
Subscribe to QEX today (special rates for ARRL members),
www.arrl.org/qex-subscription-form[3].
[1] mailto:ksiwiak@arrl.org
[2] http://www.arrl.org/qex-author-guide
[3] https://www.arrl.org/qex-subscription-form
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