In order to acquire data from the GPS satellites, you must have line‑of‑sight to the satellites, or the antenna must be placed outside without any obstructions. In addition to Option 31, the Spectrum Master requires a GPS antenna, Anritsu part number 2000-1523-R.
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Press the GPS submenu key to display the GPS menu.
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Activate GPS by pressing the GPS, On/Off submenu key so that On is underlined. When GPS is first turned On, the GPS icon is displayed in red.
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When the GPS receiver is tracking at least 3 satellites, the GPS icon changes to green.
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As long as 3 minutes may be required for the Ref Freq status to change to GPS High Accuracy in the Status menu, which is displayed on the left side of the measurement display.
To reset the GPS, press the Reset submenu key. The green GPS icon with a red cross appears when GPS satellite tracking is lost (refer to Figure: “GPS Icon, Green with Red Cross”). This occurs after being active (tracking three or more satellites).
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After GPS location Fix is attained, the internal reference oscillator begins to correct its frequency to match the GPS standard. After the internal frequency is adjusted to match the GPS standard, the status is indicated by “GPS High Accuracy” showing in the Status menu, which is displayed on the left side of the measurement display. When the GPS feature is not enabled, the reference source displays either “Internal Standard Accuracy” or a user‑selected external reference frequency in the Status menu.
Within three minutes of satellite acquisition, the reference oscillator will have an accuracy of better than 25 ppb (parts per billion). The OCXO internal standard accuracy is ± 0.3 PPM. The correction factor applied to the internal OCXO allows the instrument to maintain GPS frequency accuracy for three days at better than 50 ppb, even when the instrument is obstructed from receiving signals from the GPS satellites.
In order to acquire data from the GPS satellites, you must have line‑of‑sight to the satellites, or the antenna must be placed outside with no obstructions.
