Rf Characteristics; Receiver; Duplex Filter; Pre-Amplifier - Nokia 9000i Service Manual

After Sales
Technical Documentation

RF Characteristics

Receiver

Item
RX frequency range , MHz
Type
Intermediate frequencies , MHz
3 dB bandwidth ,kHz
Reference noise bandwidth ,kHz
Sensitivity , dBm
AGC dynamic range dB
Receiver gain ,dB
RF front end gain control range,dB
2nd IF gain control range, dB
Input dynamic range ,dBm
Gain relative accuracy in receiving
band, dB
Gain relative accuracy on channel,
dB

Duplex filter

The duplex filter consists of two functional parts; RX and TX filters. The
TX filter rejects the noise power at the RX frequency band and TX
harmonic signals. The RX filter rejects blocking and spurious signals
coming from the antenna. In PCN there is a lowpass filter between the
duplexer and RF connector, which further improves the spurious response
rejection above 2 GHz.
Pre–amplifier
The bipolar pre–amplifier amplifies the received signal coming from the
antenna. In the strong field conditions the gain of the amplifier is reduced
36 dB in GSM and 24 dB in PCN, typically.
Amendment 1 04/97
Table 3. RF characteristics, Receiver
GSM
935 ... 960
Linear, 2 IFs
71 , 13
+/– 100
270
–102, S/N ratio > 8 dB,
B = 135 kHz
N
85 , typ
69 , typ
36
57
–100 ... –10
+/–1.5
+/–0.4
RAE/RAK–1N
RF
PCN
1805 ... 1880
Linear, 3 IFs
313, 87, 13
+/– 100
270
–100 , S/N ratio > 8 dB,
B =135 kHz
N
81 , typ.
67 , typ
24
57
–100 ... –10
+/– 1.5
+/– 0.4
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