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                      THE CGC COMMUNICATOR
                            CGC #784
                    Thursday,  March 8, 2007
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                 Robert F. Gonsett, W6VR, Editor
                      <r.gonsett@ieee.org>
    Copyright 2007, Communications General® Corporation (CGC)
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  EAS CLOCK ISSUES FOR DAYLIGHT SAVING TIME
  A portion of a Letter to the Editor in CGC #783 read as
follows:
  "Don't forget to update the clock on your EAS receiver/
encoder.  If your EAS equipment is out of sync by one hour,
received activations and tests will be "out of the window" and
your EAS box will not respond to activation requests."
  In response to this innocent looking statement, the
following letters were among those received:
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                        LETTERS TO THE EDITOR
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  LETTER #1
  I have been advised by at least two EAS manufacturers NOT
to change the clock until new firmware is installed.  The EAS
system operates off of UTC, and not local time.  If you place
a new local time in the unit without the firmware understanding
the new time zone changes, the equipment will adjust to an
incorrect UTC and will experience problems.  Best to make a
manual note in the log about the time situation until new
firmware is installed.
  VP & Director of Radio Engineering (for a station group)
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  LETTER #2 (FROM AN EAS EQUIPMENT MANUFACTURER)
  Most users should not simply move the time ahead one hour.
  If a user moves the EAS unit's clock forward an hour, many
EAS devices will also move the UTC time used to send and receive
alerts ahead one hour - and that will cause the device to send
alerts with the wrong time.
  The actual procedure that the user needs to follow varies
from manufacturer to manufacturer, but for devices that are set
up to automatically handle the Daylight Saving Time conversion,
moving the "local" time ahead an hour is the wrong thing to do.
  Gary Timm has a web page covering the major manufacturers,
which includes pointers to information on manually working around
the issue as well as information on firmware upgrades, see the
URL below.
  Harold Price, Sage ENDEC
  http://www.sbe24.org/eas/dst.asp
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  Other Letters to the Editor of the CGC Communicator will
be handled at a later date.  Thanks for the interest in the
"Y-2.007-K issue" - obviously a crucial topic right now.
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