CCS Technical Documentation
System Module
NKC-1X
Issue 1 02/03
Nokia Corporation
Page 51
Frequency Synthesizers
NKC-1X synthesizer consists of three synthesizers, one UHF synthesizer and two VHF
synthesizers. UHF synthesizer is based on integrated PLL and external UHF VCO, loop fil-
ter and VCTCXO. Due to the RX and TX architecture this UHF synthesizer is used for down
conversion of the received signal and for final up conversion in the transmitter. A com-
mon 2GHz UHFVCO module is used for operation on both low and highband. Frequency
divider by two is integrated in TACO.
Min voltage gain,
Mixer + 2nd IF (IF+2nd AGC min.)
6
dB
Gain charge,
Mixer+2nd IF
1.4
0.9
dB, temp
-30...+85 C
IQ AMP2
RF input impedance differential
1.2
kohm/pF
RF input frequency range
135.54
MHz
Conversion gain @ RI=1kohm
23.5
24
24.5
dB
IF AGC gain range (5x6 dB)
30
dB
IF AGC gain step (5 steps)
6
dB
IF AGC gain error relative to max gain
-0.5
+0.5
dB
AMP2 gain
18
dB
-3dB frequency
21
25
29
kHz
LPF: 4th order Chebysev
LPF gain
0
dB
Corner frequency tuning range
14
17
kHz
Corner frequency tuning step
1
kHz
Attentuation @ 30 kHz *
24
dB
Attentuation @ 60 kHz *
55
dB
Attentuation @ 120 kHz *
80
dB
Attentuation @ 240 kHz *
60
dB
Attentuation @ >480 kHz *
40
dB
AGC
AGC gain range
-6
36**
dB
AGC gain range step
7 steps
6
dB
AGC gain error relative to max gain
-0.5
+0.5
dB
Max IF/2nd IF buffer output level
3
V pp (differential)
Parameter
Minimum
Typical/
Nominal
Maximum
Unit/Notes
Summary of Contents for NKC-1X Series
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Page 34: ...NKC 1X System Module CCS Technical Documentation Page 34 Nokia Corporation Issue 1 02 03 ...
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