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Rx AM suppression (GSM)
Context
Rx AM suppression is used to tune the AM suppression capabilities of the GSM receiver.
AM suppression is related to ability of the receiver to operate when there is a disturbing AM modulated signal
near the received channel signal frequency.
RFIC has tunable compensation circuit which has an effect on the AM suppression ability.
In Rx AM suppression, a continuous useful signal accompanied with an AM modulated signal 10MHz above the
current channel is fed to the antenna. RFIC control word values are iterated until a minimum RSSI signal is found.
Steps
1.
Connect the module jig's GSM connector to the signal generator.
2.
From the "Operating mode" dropdown menu, set mode to "Local".
3.
From the Tuning menu, choose GSM -> Rx AM Suppression.
Page 7–36
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RF Troubleshooting and Manual Tuning Guide
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