Service Manual

MM-E 2072-09333-00
2-8
IF Processor
45.1 MHz
RF Output
1.6 - 30 MHz
DSM
Synthesizer Subsystem
First LO
Frequency = 46.7 - 75.1 MHz
Step = 8.75 kHz
÷2
VCO 1, 2, 3
Frequency
Step = 10 kHz
= 368.4 MHz
Second LO
Frequency = 46.15 MHz
Step = 1.25 kHz
÷8
VCO 4
0 to 1.25 kHz
10 Hz Resolution
DSP
1.05 MHz
Figure 2-5. Transmit Path Frequency Conversion Scheme
RF Input
0.1 - 30 MHz
0 to 3 kHz
10 Hz Resolution
DSP
430.77 kHz
Synthesizer Subsystem
÷2
IF Processor
45.1 MHz
IF Processor
450 kHz
First LO
Frequency = 45.2 - 75.1 MHz
Step = 8.75 kHz
VCO 1, 2, 3
Frequency 352.4 - 369.2 MHz
Step = 10 kHz
=
Second LO
Frequency = 44.05 - 46.15 MHz
Step = 1.25 kHz
÷8
VCO 4
Figure 2-6. Receive Path Frequency Conversion Scheme
2-1.1.3.4 Control Subsystem
The Micom-Z control subsystem includes the main microcomputer subsystem located on the LORD
module, and a microcontroller located on the CONTROL HEAD module.
a. The CONTROL HEAD microcontroller provides the interface to the front panel keypad and
LCD, which enables the operator to control Micom-Z operation and monitor its status. In
addition, the microcontroller can also communicate with external equipment, for example, a PC
running the RSS or MRC utility, via an additional serial asynchronous control channel
terminated in the front panel audio connector.
The microcontroller communicates with the main microcomputer subsystem via a serial
asynchronous control channel. This serial channel is used to transfer the commands entered by
the operator using the front panel keypad, and data received via the serial control channel from
RSS or MRC (this data includes operational parameters, and radio set calibration data for the
transmit power and frequency accuracy).
In addition to the functions described above, the microcontroller also controls the LCD heating,
and the LCD and keypad backlighting.
The microcontroller supports the connection of an external memory card using the SD format,
which can be plugged into the SD socket at the top of the front panel.