WJ-8611 DIGITAL VHF/UHF RECEIVER
5-20 CIRCUIT
DESCRIPTIONS
Display and indicators are updated via manipulation of the 19-bit Address
Bus (A0 – A18) and the 16-bit Data Bus (D0 – D15). Operating
instructions and data tables for the microcontroller are stored in the 64K x
16 EPROM chip. A 32K x 8 Static RAM (SRAM) chip provides
temporary memory space.
Encoders are utilized for both the Frequency Tuning wheel (optical) and
the Edit Control knob (mechanical). The encoders detect changes to
control settings and provide two sets of square waves (CH A and CH B) to
the microcontroller. The Frequency Encoder outputs are routed to an
Up/Down counter to determine the direction and distance the wheel has
turned. The Edit Control or “Mode” Encoder outputs a two-bit Gray Code,
which is routed directly to the microcontroller. The Gray Code contains
the turning direction and distance information required.
The front panel also provides the audio and control setting for the Phones
Jack. The connection to the Digital Control Assembly (A2) is made
through connector E1.
The Parameter Display on the front panel is actually four 8-digit, green 5 x
5 Dot Matrix ICs. Chip select (DISPLAY 0:3), Data, and Display Clock
signals from the microcontroller are multiplexed together to produce Serial
Load (SLOAD 0-3), SDCLK, and SDATA outputs. These signals are used
by the four Dot Matrix ICs to display the appropriate parameters.
The Front Panel Assembly (A1) features a switch matrix consisting of a
16-key keyboard and 16 individual pushbuttons. Each key forms a
junction between a column input and a row output of the 8 x 4 switch
matrix. The microcontroller continuously monitors for switch closure by
setting a logic high on each of the eight columns, one at a time, and then
reading the data returned by the row outputs. Data signals are buffered
(DIGIT/COL 0:7) and then routed to the switch matrix as KPCOL 0-7.
The row outputs (KPROW 0-3) are routed directly to the microcontroller.
Active switches with indicators are lit via the SEGDRIVE and
DIGIT/COL Buses.
The SEGDRIVE and DIGIT/COL Buses also activate the Frequency
Display, the Tune Meter Display, the Decimal LED, the Tune Lock LED,
the Shift LED, and key-embedded indicators. Both buses originate at the
microcontroller as part of the Data bus. The signals are buffered and
routed through drivers before being applied to the appropriate
display/LED. The entire operating
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5.5 TYPE 766032-1 SWITCHING POWER SUPPLY (PS1)
The Switching Power Supply (PS1), illustrated in the WJ-8611 Main
Chassis schematic diagram,
voltages for the WJ-8611 Receiver. It receives its line voltage input from
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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