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TRC-70
MAT-100 (AUTOMATIC ANTENNA TUNER)
Circuit Description
¢ Tuning
When tuning is completed, the TT terminal is set to
high to send a termination signal. When the MAT-100
detects the termination signal, the STBY signal goes
low to return the TS signal to high. The standby mode
is then entered to stop the clock.
When DIP switch $4 of the LED unit (WW02-0883-08)
is set to MANUAL, tuning can be performed manually.
The relay switch can be controlled with switches $1
through So.
¢ Through mode
|
The MAT-100 can be set in the through mode in
which an antenna and the remote controller are di-
rectly connected.
In this case, the TT terminal of the
remote controller goes low.
The MAT-100
detects
that the TT terminal is low.
The CPU sets a relay
through mode.
When mode setting is completed, the
CPU enters the standby mode.
¢ Tuning test
The MAT-100 has a TUNING START switch to test
tuning or adjust an antenna.
To test tuning, the MAT-
100 must be connected to a remote controller with the
POWER switch ON.
When push-button switch S1 of
the MAT-100 is pressed, tuning starts.
Push-button
switch $1 sets the TS terminal low and sends a tuning
*start command to the remote controller. When a tune
signal is sent from the remote controller, the MAT-100
starts tuning. When tuning is performed normally, the
"test operation is completed.
Note : When tuning cannot be performed within 15
seconds, a tuning termination command is issued by
the remote controller.
108
¢
Interface
Control signals are sent and received between the
MAT-100 and remote controller using the TS and TT
terminals.
The TS and TT terminals are bi-directional
signal lines.
1. Normal tuning
When the tuning state is set with a remote control-
ler, the TS signal of the remote controller is set low
(usually set to high). When the MAT-100 detects that
the TS signal is low, the CPU clock is activated to reset
the system. At this time, the CPU is activated to check
the TS and TT signal status.
The CPU sets the TT
signal low and reports tuning start. When the TT signal
goes low, the remote controller issues a tuning signal.
When the MAT-100 completes tuning, the TT signal is
returned to high to indicate completion.
The tuning
signal from the remote controller stops. The TS signal
is set to high to complete the tuning.
When the TS
signal is set to high, the MAT-100 enters the standby
mode and stops the clock operation.
2. Abnormal tuning
The remote controller counts for 15 seconds after
the TS signal is set low and the TT signal is set to high.
lf the TT signal is not set low before the count is com-
pleted, the MAT-100 judges that tuning can not be
performed normally.
The remote controller then sets
the TS signal to high and reports a tuning Interruption.
When the TS signal is set to high, the MAT-100's CPU
returns the TT signal to high to stop tuning. The MAT-
100 then enters the standby mode.
3. Through operation
When the TT signal from the remote controller is
set low, a through operation is performed.
The MAT-
100 activates the CPU and sets the TS signal low. The
remote controller then returns the TT signal to high.
When tuning is completed, the MAT-100 returns the
TS signal to high and sets the CPU
in the standby
mode to complete the through operation.
TRC-70
MAT-100 (AUTOMATIC ANTENNA TUNER)
For tuning
TS
.
|
RADIO
TT
=
-
MAT~100
|
J:
For abnormal tuning
TS
;
RADIO
L
Jj
:
~
TT
i——
15sec
tt
MAT-100
|
=e
TS
MAT-!100
!
RADIO
— we
oe
el
be
ee
ees
TT
—
|
Fig. 1 Interface timing chart
¢ Manual Tuning
The MAT-100 can set the manual tuning. For manu-
ally tuning, change DIP switch S4 of the LED unit from
AUTO to MANUAL.
When
DIP switch S4 Is set to
MANUAL,
relays K1 and K2 are selected so that a
sensor circuit is through-connected.
LED indicator
D48 goes on to indicate tuning completion.
When
DIP switches S1 through S3 are selected,
relays K1 and K2 are set on or off. The status of S1
through S3 is sent to 1C10 through IC13 of the MAT-
100 to drive the relays. Table 1 gives the relationships
between the DIP switch settings and operation of the
relays.
109
¢
Control cable terminals
+13.6V
MAT-100's +13.6 V DC
GND
Ground
|
TS
Bidirectional control terminal that controls tun-
ing start and completion via a remote control-
ler and reports through start and completion
via the MAT-100.
TT
Bidirectional
control terminal
that controls
through start and completion via a remote
controller and controls tuning start and com-
pletion via the MAT-100.
GND
Ground
|
ANT.C
Determines the antenna current via the MAT-
100 and sends it to the remote controller.
¢ Tuning Circuit Selection
The tuning circuit is used as a PI matching circuit by
connecting jumpers J5 and J6.
When the tuning cir-
cuit is not matched using a Pl match, remove the PI
circuit and use an L-type matching circuit.
The Pl
circuit is normally used.
|
DIP switch
|RElay No. | DIP switch-on sequence operation
$1
1
K-3
L1 through
2
4
L2 through
3
5
L3 through
4
6
L4 through
5
7
L5 through
6
8
L6 through
7
9
L7 through
8
10
L8 through
9
11
L9 through ©
10
13
L10 through
S21
14
| L11 through
2
12
Capacitive circuit's IN switch ON
3
15
Capacitive circuit's OUT switch ON
4
16
C76, 77 ON
5
17
C78, 79 ON
6
18
C80, 81 ON
7
19
C82, 83 ON
8
20
C84 ON
9
21
C85, 86 ON
10
22
C87, 88 ON
$3
1
23
C89, 90 ON
2
24
C91, 92 ON
Table 1 DIP switch and relay number
TRC
110
@ AC
®T<
6 Fs
¢
Sens
An a'
serted I
duce ur
signals i
terminal
The t
signal a!
block.
The f
HF sign:
L13, RO
ing D1 %
verter.
The
signal fc
cient or
The f
buffers
and D4°
ance sI¢
a 50-oh!
Volta
sisting
other, t!
Input
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