Nokia 6610i Service Manual
CCS Technical Documentation
7-System Module and User Interface
Company confidential
RM-37
Issue 1 04/2004
©Nokia Corporation.
Page 45
RF Frequency Plan
RF frequency plan is shown below. The VCO operates at the channel frequency multiplied
by two or four depending on the frequency band of operation. This means that the base-
band modulated signals are directly converted up to the transmission frequency and the
received RF signals directly down to the baseband frequency.
by two or four depending on the frequency band of operation. This means that the base-
band modulated signals are directly converted up to the transmission frequency and the
received RF signals directly down to the baseband frequency.
Figure 19: RF Frequency plan
HELGA
PLL
26 MHz
VCTCXO
f
f/2
f/4
f
3420-
3980
MHz
3980
MHz
925-960
MHz
MHz
880-915
MHz
MHz
I-signal
1805-1990
MHz
MHz
f
f/4
f
f/2
Q-signal
I-signal
I-signal
I-signal
RX
TX
I-signal
Q-signal
1710-1910
MHz
MHz