Icom HM-169 Instructions page 2

PANEL DESCRIPTION
OPTT SWITCH
Hold down to transmit; release to receive.
©TOP KEY (for HM-170GP/HM-171 GP/HM-175GPS/HM-189GPS only)
HM-170GP/HM-171GP:
Desired functions can be programmed by your dealer, depending
on connected transceiver (see the transceiver's instruction manual).
• Only HM-171GP; Key illumination lights while the HM-171GP is
connected to the transceiver, then it blinks while GPS receiver
receives GPS signals.
HM-175GPS/HM-189GPS:
Push to turn the GPS receiver's power ON/OFF.
• Key illumination lights when GPS receiver is ON. Key illumina
tion lights OFF when it's OFF.
• Key illumination blinks while GPS receiver receives GPS signals.
©GPS ANTENNA
(for HM-170GP/HM-171GP/HM-175GPS/HM-189GPS only)
Connection
HM-169/HM170GP •HM-171GP •HM-184 • HM-174/HM-175GPS •HM-189GPS
HM-170GP/HM-171GP/HM-175GPS/HM-189GPS
o-§
Microphone
Belt clip
Connector
HM-169/HM170GP
HM-171GP
7T
HM-174/HM-175GPS
HM-184
HM-189GPS
ATTENTION FOR GPS RECEIVER (HM-170GP/HM-171 GP/HM-175GPS/HM-189GPS only)
About calculating position
The GPS receiver receives signals from GPS satellites. It calculates its posi
tion by the orbit information of the GPS satellites and needs to measure the
distance between itself and three or more GPS satellites to obtain a reliable
position. A receiver acquires all available satellites when it is first powered up,
powered oft for a long time, or powered up again at a place a long way from
when it was last powered off. Normally, it takes approximately 1 minute for
determining a position.
In places where the GPS signals cannot reach the GPS receiver such as in
caves, underground, indoors, under overpasses, beside tall buildings, or near
any other devices that cause electronic interference, the GPS receiver may
show position errors (misplacement) or no position reading at all.
As the satellites are continuously moving, measurement of the position or
time by the GPS receiver may take a while, and/or no position reading can
be made in some instances. Even if the GPS receiver receives signals from
three cr more satellites, it may take a longer time to determine a position
depending on the satellite locations.
Radio wave reception from the satellites is not only blocked by buildings and
trees, but also by the human body in some instances. Therefore the GPS
antenna should be kept as far away from the body as possible for best recep
tion.
About Almanac and Ephemeris Data
To reduce the time for calculating position, the GPS receiver stores the
Almanac Data (the orbit course-orbital parameters of the satellites) in its inter
nal memory. When the GPS receiver is left with the power OFF for a long time,
the GPS receiver needs to acquire the Almanac Data again. In this case, the
receiver starts as a "cold" start.
The GPS receiver stores Ephemeris Data of the satellite's orbital course, and
refers to this data when the GPS receiver is turned OFF for a short time. This
is called a "hot" start, and uses the Ephemeris Data that is valid to within less
than 4 hours.
Icom Inc.
1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan
Printed on recycled paper with soy ink.
Location precision
The GPS receiver automatically calculates its position when the GPS receiver
receives GPS signals from three or more GPS satellites.
The GPS satellite's measurement error about ±10 meters, however this can
vary up to several hundred meters depending on the surrounding environ
ment.
When the GPS receiver is powered up again at a place a long way from when
it was last powered off, the first calculation of its position may be incorrect in
some cases.
The GPS information and its accuracy varies depends on the GPS system
being acquired, place and time.
Generally a GPS receiver cannot obtain a clear signal from the satellite when
indoors. As a result, the GPS receiver may show position data several hun
dred meters from actual place, or may show no position reading at all.
About NMEA sentence
The GPS receiver outputs the last memorized NMEA sentence if the current
position data cannot be received due to the GPS signal being blocked by a
building, car roof, etc., or it takes a long time to acquire the position data from
a cold start. In this case, the NMEA sentence information may also include an
"invalid" Indication.
About Condensation
If condensation appears on the outer casing of the GPS speaker microphone
due to a sudden change in temperature (E.g. brought to a warm room from
a cold place), it is likely condensation has also built-up on the inside of the
microphone. In this case, keep the microphone with power OFF at room tem
perature for about 1 hour. Do not turn ON the microphone until the conden
sation disappears, as this will damage the microphone.
Count on us!
A-6621H-1G-® Printed in Japan
©2007-2010 Icom Inc.