15.1.1999
4y1800gb
22
Product: TGP-60-EU (Vega) / OY1800-RF
5.4.2 Receiver
The incoming RX signal from duplex-filter X546 is first amplified in LNA amlifier
of PMB 2405, then filtered in X460 and then fed to the first mixer via matching
and balun network L460, L461, C453, L470, L471, and C470 - C473. In first
mixer the received signal is down converted to the first IF which is 246 MHz
and filtered in band-pass filter X480. After filtering the signal is amplified in
three wire bus adjustable AGC (Automatic Gain Control) amplifier and fed
internally into Quadrature demodulator where the signal is demodulated to
baseband differential I/Q-signals. After demodulation the differential signals are
filtered and amplified before the signals are fed into Baseband-board via
connector V1.
5.4.3 Transmitter
The differential I/Q-signals from Baseband-board and the RF signal from
synthesizer are fed to quadrature modulator I210 (PMB 2240). The modulated
RF signal is then filtered (X501), amplified (Q520) and then fed into power
amplifier I540 which output power is adjustable. The output power adjustment
is done in comparator I6A, where the signals from baseband board and power
output coupler/rectifier X545/D545 are compared. The modulated RF signal is
then fed to the antenna via duplex-filter X546.
5.4.4 Synthesizer
The first local frequency (1181 MHz - 1206 MHz) is generated in VCO (voltage
controlled oscillator) module X250 after that it is fed via balun network L260,
L261 and C260 - C263 to the TX-chip I210 where it is sampled for prescaler
and buffered and fed to RX-chip I410 (PMB 2405) to be used as a first local
injection. The first local frequecy is controlled by PLL-circuit I300 (PMB 2307)
which is controlled by the u-prosessor of the baseband board via three wire
serial control bus. The second local injection 246 MHz is generated in RX-chip
by deviding by two the inbuild 492 MHz VCO signal. The second local
frequecy is controlled by fixed- frequency PLL-circuit which is build in to the
TX-chip. TX-carrier frequency (890 MHz - 915 MHz) is generated by
subtracting the 246 MHz 2nd local frequency from the first local frequeny which
is working from 1136 MHz to 1161 MHz in TX-mode. Both PLL:s are using the
13 MHz VCTCXO (Voltage Controlled Temperature Compensated X-tall
Oscillator) signal as reference. The frequency of VCTCXO is controlled by u-
prosessor of the baseband board thus taking care also of the AFC (Automatic
Frequency Control) function.
5.4.5 Power supply and power switching.
The battery voltage is regulated in regulators I101, I102, I103 and I180. The
used supply voltages are +3.0 and +3.3 V. The power on/off switching is done
from baseband board using output-enable pin each regulator.
Содержание TGP-65-EU iO
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