After Sales
Technical Documentation
RAE/RAK–1N
RF
Page 3– 13
Amendment 1 04/97
RF Characteristics
Receiver
Table 3. RF characteristics, Receiver
Item GSM PCN
RX frequency range , MHz 935 ... 960 1805 ... 1880
Type Linear, 2 IFs Linear, 3 IFs
Intermediate frequencies , MHz 71 , 13 313, 87, 13
3 dB bandwidth ,kHz +/– 100 +/– 100
Reference noise bandwidth ,kHz 270 270
Sensitivity , dBm –102, S/N ratio > 8 dB,
B
N
= 135 kHz
–100 , S/N ratio > 8 dB,
B
N
=135 kHz
AGC dynamic range dB 85 , typ 81 , typ.
Receiver gain ,dB 69 , typ 67 , typ
RF front end gain control range,dB 36 24
2nd IF gain control range, dB 57 57
Input dynamic range ,dBm –100 ... –10 –100 ... –10
Gain relative accuracy in receiving
band, dB
+/–1.5 +/– 1.5
Gain relative accuracy on channel,
dB
+/–0.4 +/– 0.4
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.
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