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Icom SM-20 Instructions page 3

Desk microphone power-on and ptt indicators

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Reprinted with the permission on ARRL. Copyright © ARRL
January 2016, QST p59
the Gerber files available at no cost to any-
one who would like them. There are also a
limited number of finished PCBs available
at my cost plus postage. Contact me by
e-mail for details.
Photos by the author.
ARRL member Don Dorward, VA3DDN, has
been a licensed Amateur Radio operator since
2002, with basic and advanced certification. He
graduated Ryerson Electronics Technology in
1963. His career positions included manage-
ment of R & D, ISO9001, and ISO13485 Quality
Systems, Regulatory Affairs, in the areas of
technical support for electronic components
and materials, environmental testing and instru-
ment calibration, automotive electronics product
development, switch mode power supply de-
velopment, medical electronics, UL/CSA and
EU product safety testing and certification, and
EMI compliance. Don developed programs for
accelerated life testing methods such as HALT
and HASS, in-house training for Quality Sys-
tems, ESD prevention, and IPC Workmanship
Standards for the Acceptability of electronic
equipment. He is the inventor on two patents,
and retired in 2006. Don is a Life Member of
®
QST
– Devoted entirely to Amateur Radio
IEEE, Radio Amateurs of Canada, and Ten-Ten
International. You can reach him at va3ddn@
arrl.net.
For updates to this article,
see the QST Feedback page at
www.arrl.org/feedback
www.arrl.org
January 2016
.
3

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