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The SL signal is controlled with these levels as in the truth table, shown below.
VFO
SW
T/R SW
T/R
T/R
T/R
T
T
X CONTROL
CIRCUIT
This circuit controls the X signal to select the frequency steps of either 100Hz or
5KHz.
The X line is connected to Pin 15 of 1С1, and when the line is HIGH, the fre-
quency steps are 5KHz, and when LOW, 100Hz.
The B4 line is connected to the B4 output of ІС1, and is HIGH іп the frequency range
between 146.000MHz and 147.995MHz and LOW between 144.000MHz and 145.999.9
MHz.
The ЕМУУ line is connected to the power line which is supplied in the FM mode,
so the line is HIGH in the FM mode and LOW in the SSB and CW modes.
The TS line is connected to the TUNING
SPEED
BUTTON,
and is LOW when the
button is depressed.
|
Х CONTROL
CIRCUIT
SCHEMATIC
DIAGRAM
FREQUENCY
RANGE
ON/OFF
146 ~ 148
zd ee
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