After Sales
Technical Documentation
RAE/RAK–1N
RF
Page 3– 14
Amendment 1 04/97
Table 4. Pre amplifier specifications
Parameter Minimum Typical /
Nominal
Maximum Unit / Notes
Frequency band GSM
PCN
935–960
1805 – 1880
MHz
MHz
Supply voltage 4.27 4.5 4.73 V
Current consumption GSM
PCN
5
4
6
5.5
7
8
mA
mA
Insertion gain GSM
PCN
15
8
16.5
10
17
12
dB
dB
Gain flatness +/– 0.5 dB
Noise figure GSM
PCN
2.0
2.3
2.5
2.8
dB
dB
Reverse isolation 15 dB
Gain reduction GSM
PCN
33
21
36
24
39
27
dB
dB
IIP3 GSM
PCN
–12
–12
–10
–10
dBm
dBm
Input VSWR (Zo=50 ohms) 2.0
Output VSWR (Zo=50 ohms) 2.0
RX Interstage Filter
The RX interstage filter is a three pole ceramic filter in PCN. In GSM there
is a SAW filter. The filter rejects spurious and blocking signals coming
from the antenna. It also rejects the local oscillator signal leakage.
First mixer
The first mixer is a single balanced passive diode mixer. The local signal
is balanced by a printed circuit transformer. The mixer down converts the
received RF signal to the first IF signal.
Table 5. Mixer Specification
Parameter Minimum Typical /
Nominal
Maximum Unit / Notes
RX frequency range GSM
PCN
935
1805
960
1880
MHz
MHz
LO frequency range GSM
PCN
1006
1492
1031
1567
MHz
MHz
IF frequency GSM
PCN
71
313
MHz
MHz
Conversion loss 5 6 7 dB
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