CALAMP WIRELESS NETWORKS INC. GPDA Manual De Usuario

G3 is per unit factory-calibrated. Deviation values listed below serve as reference only.

48.0kb/s

±4.5

±3.7

24.0kb/s

±2.9

±2.8

24.0kb/s

±2.2

±2.2

43.2kb/s

±4.5

±3.7

21.6kb/s

±2.9

±2.8

21.6kb/s

±2.2

±2.2

64.0 kb/s

±4.5

±3.2

32.0kb/s

±3.2

TBD

32.0kb/s

±1.9

2.0

57.6 kb/s

±4.5

±3.2

28.8kb/s

±3.2

TBD

28.8kb/s

±2.2

2.2

Tolerance is +5%, -10% for all bit rates.

About three minutes after ignition is turned-on, the PWR LED on the G3 front panel should flash
in amber color at the rate of one pulse per second.

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 This indicates that the GPS has acquired the

sky position of a sufficient number of satellites to arrive at a ground position solution.

If the GPS has a good view of the sky and still has not generated any position solution within
three minutes (it may take up to 10 minutes or more if the sky view is partially blocked.), the
following trouble-shooting procedures should be undertaken to isolate the fault:

1) Disconnect the GPS antenna cable connector from the Gemini radio and check for + 5 VDC

on the center pin of the GPS antenna connector on the radio using a Digital voltmeter (DVM).
If the voltage is present, do not reconnect the cable and proceed to step 2.

2) With the DVM, measure resistance between the shell and the center conductor of the GPS ca-

ble, resistance should be between 100 and 300 Ohms, if it measures open or short circuit the
GPS antenna is either a passive antenna which is the WRONG type, or a defective active an-
tenna, replace with a known good active antenna.

3) Connect the new antenna to Gemini and wait about three minutes for the POSITION

ACQUIRED indicator to start flashing on G3, if not, the Gemini radio or its GPS receiver is
defective.

                                                     

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