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KX-G8300 |
2) PLL Circuit
Circuit Operation:
The bearing signal is multiplied from 360 pulses/rotation to 4096 pulses/rotation in the PLL circuit and
sent to the CPU. The heading pulses are sent to the CPU via the shaping circuit. These pulse signals are
used in the processing for the azimuth information.
iC
2 2
S-HEAD
HEADING
PULSE
BEARING
PULSE
@QOWV@OQOOOOO
"The signal level is TTL
when not specified.
Fig. 35
3) TX Trigger Generator
cpu
Circuit Operation:
When the TX key on the display unit is pressed, TX trigger pulses are generated by the CPU, and these
are sent to the antenna unit via the synchronizing circuit, gate circuit and buffer circuit (Q7 ~ Q9).
The TX trigger signal path is as follows;
IC1 pin26 —> 1C18 pin2 —>1C18 pini3 —>1IC19 pin2 + 1C19 pind —>1C22 pini1 —> IC22 pin8
+> C20 —>1IC39 —Q7
—> Q8,Q9 ->CN2
pini —> Antenna Unit
'Ci
CPU
IC 18, 19 Synchronizer
{C20,22
Gate
1Ci2
()
1c!
Long f = 1 kHz
BCK
Short
f = 2.5 kHz
Jew
OV
+5V
Cig
R38.
+5V
+5V
45V
10 ps
14
15
4 1Cr9
t {C22
eae ise
Ihe
aA
13
2
ms
5
Ul
ec
Q
ma
Q
cK
RESET
Tout
}28
2\8
=|8
cuR
afk
zo.
OP
>
3y
Ice
R
CR
R135
IC20
Py
G
13
oan
10 ps
+12V
icr ©
+12V
TXOK
CN602
R72
+12V
C26
R70
Qe
D2
uni
S
Antenna
Uni
anes
ry)
Rv
IC39
[r4
ene
(>)
Rr
Qo
BV
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ae
Tee ett
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:
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