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Figure 3-1. Tunable Coupler Block Diagram
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TM-32-5865-216-24-P Tunable Coupler CU-2293/ALQ-151(V) Manual
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Figure 3-2.Decoder CCA A4 Block Diagram
TM 32-5865-216-24&P
Motor control CCA A2
Feedback switch CCA S4
RF monitor CCA A6
Power supply CCA A1
Extender CCA A5
CONTROL CIRCUIT.
The tunable coupler receives 16-bit, Manchester­coded  command
words as serial data input at connector pins J4­C and J4­D.
The
control circuit decodes each command word to select the transmit or
receive operating mode and tune RF switch assembly S2 to a specified
100-kHz bandwidth.  Table 3-1 lists the function of each bit in the
command word.
3-5.1 Decoder CCA A4.  Refer to figure 3­2. The  decoder  CCA  control
circuit converts the command word input into
subband, and data
strobe outputs to control logic CCA A3 and RF relays K1 and K2.
3-2 lists the control signal accessed from the decoder CCA test
points.
As shown in figure FO-2, the digital input passes through
line receiver U18A and parity flip­flop U6A to command word detector
and decoder U1 through U5 and U8 through U12.
Three consecutive high
bits indicate a command word follows and provide synchronization data
to clock generator U14.  The l-MHz CLK, and RESET outputs of multi-
vibrators U14A and U14B clock the command word into parity flip­flop
and shift registers U1 and U2.
If parity is correct (even), the Q
output of U6 clocks the command word into flip­flops U8 through U10.
The Q output of U6 also passes to the status circuit (U7) and control
logic CCA A3 as the parity and data strobe signals, respectively.
Flip­flops U8 through U10 convert the 16­bit command word into 12 fre­
quency bits and (DBO through B11) and
signal.
Switch
position
decoder U15 and U16 converts the DB0 through DB11 signals into
Command Word Bit Functions
Bit
Function
o
Frequency 100 kHz BCD 1
Frequency 100 kHz BCD 2
1
2
Frequency 100 kHz BCD 4
Frequency 100 kHz BCD 8
3
4
Not used
Parity (even for 16 bits)
5
Not used
6
7
Transmit/Receive (1=TX, 0=RX)
Frequency 1 MHz BCD 1
8
Frequency 1 MHz BCD 2
9
10
Frequency 1 MHz BCD 4
11
Frequency 1 MHz BCD 8
12
Frequency 10 MHz BCD 1
13
Frequency 10 MHz BCD 2
14
Frequency 10 MHz BCD 4
15
Frequency 10 MHz BCD 8

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