Receiver; Synthesizer; Antenna - Nokia RA-2 Rf Description & Troubleshooting

RA-2/3
7 - RF Description and Troubleshooting
ceiver. The transmitter harmonics are attenuated at the RF filter to a required level. The Tx/Rx
switch, BT/WLAN switch, RF filter, RF test connector and antenna are common to BT and
WLAN in RA-2/3.
Parameter
Typical output power (mean power)
Min output power (mean power)
Output spectrum
Modulation accuracy
Carrier Suppression

Receiver

The receiver is a direct conversion receiver based on a single chip RFIC. The received input
signal is filtered with a ceramic band pass filter after which the Tx/Rx switch selects the receiver
branch..
Typical 3 dB bandwidth
Sensitivity, 2Mbps (1024 byte frame)
Sensitivity, 11Mbps (1024 byte frame)
Max. Rx voltage gain (from antenna to Rx ADC)
Typical receiver output level
Typical AGC dynamic range
Usable input dynamic range
RF gain step

Synthesizer

The PLL synthesizer with VCO is integrated into RFIC, only the loop filter is needed outside the
RFIC.

Antenna

Antenna is located in the corner of the engine PWB. Antenna interface is single ended 50 W.
Issue 1 09/04
Table 14: Transmitter characteristics
17.5 dBm (conducted), Maximum output
power 100 mW (EIRP)
3 dBm
ACPR1 _ -33 dBc, ACPR2 _ -53 dBc
<35%
>15 dBc
Table 15: Receiver characteristics
Parameter
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Value
Value
7.5 MHz (I and Q channels)
-90 dBm
-85 dBm
102 dB
500 mVp-p
100 dB
-10 dBm...-92 dBm
30 dB, typical
55