BK Radio
Page 4-5
theory of operation
The Tx Power Control signal comes from the DAC and is stepped to allow three power levels (High,
Medium, and Low) as chosen by the user. The control voltage is adjusted by the microprocessor to
ensure constant output power over the bandwidth of the radio.
The Antenna Switch routes the RF signal from the transmitter to the Harmonic Filter and antenna while
the radio is in transmit mode. When in receive mode, the antenna port is routed to the receiver. In
Transmit Mode, both pin diodes in the Antenna Switch are turned on, completing a signal path to the
Transmitter and shunting the Receiver path to ground. In Receive Mode, both pin diodes are turned off,
allowing RF signals to flow to the Receiver with the Transmitter output port removed from the circuit.
The Harmonic Filter attenuates the harmonics created by the Power Amplifier to meet or exceed the
transmit spurious and harmonic specification. The passband input and output impedances of the filter
are 50 Ohms.
receiver
The receiver section consists of many circuits which perform a variety of tasks including filtering,
impedance matching, mixing, and analog-to-digital conversion. The main blocks of the receiver are:
• Tunable Preselector
• Low Noise Preamplifier
• Fixed Image Rejection Filter (VHF Models)
• 2nd Tunable Preselector (UHF Models)
• Mixer
• Crystal Filter
• Tunable Impedance Match (UHF Models)
• Variable Gain IF Amp
• AD9864 IF Integrated Circuit
Tunable
Pre Selector Filter
136-174 Mhz
LO
Low Noise
Pre-Amplifier
Variable
Gain IF Amp
Tx / Rx
Crystal Filter
45 MHz
Fixed Image
Rejection
Filter
1st IF
Gain
Control
Mixer
Antenna
Switch
Harmonic
Filter
Preselector
Tune Control
To Tx
DAC
From uP
45 MHz
AD9864 IC
IF Digitizer
To uP
LNA
2nd IF
ADC
Decimation
Filter
Formatting /
SSI
SPI
To DSP
TCXO
Reference
19.6608 MHz
LO Synthesizer
Mixer
LO VCO
42.696 MHz
Loop Filter
Control Logic
2nd IF Filter
Clock VCO
18.432 MHz
Loop Filter
Clock Synthesizer
2.304 MHz
2.304 MHz
vhf receiver Block diagram
Содержание P150
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