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TRC-70
MAT-100 (AUTOMATIC ANTENNA TUNER)
¢ LED unit
This circuit consists of LED indicators D1 through
D22, AUTO/MANUAL selector switch S4, and switches
S1 through S3 to operate an LC tuning circuit relay
during manual operation.
LED indicators D1 through
D22 go on when the corresponding LC tuning circuit
relay is set on. The LED unit is also connected to J7
and J8 on the main unit's board via sockets J1 and J2.
AUTO or MANUAL is selected with switch $4.
In
the auto mode, ground (GND) is connected to pin 23 of
J1 (output enable terminal of IC7, C8, and IC9 on the
main unit's board).
In the manual mode, 5.3 V is
connected to pin 23 of J1 as in auto mode.
in the manual mode, a voltage is applied to pins 1
through 22 of J1 (S1 through S3 are set to OFF).
When
switches S1 through S3 are set to ON, the
voltage goes low.
As a result, 1C10 through IC13 on
the main unit's board and the LC tuning circuit relay are
activated.
118
1. Manual mode operation
When $1 through $3 set to OFF, the relay is set on
and the corresponding LED indicator goes on.
2. Auto mode operation
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