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DURING CAP PHASE
U6-9, 3.2 V
U6-&4.'
V
DURmG
IND PHASE
U6-9,4.'
V
U6-8' 3.2 V
PUTS ARE APPLIED
TO U6D.
ow
IF RF INPUT
PHASE
IS
JUTPUT IS HIGH IF RF mpuT
.'"
OSS CI1
IS PROPORTIONAL
TO
POWER A 7THE RF TUNER INPUT.
'PLIED VIA L7 TO U6C.
B
C12 IS PROPORTIONAL
TO
WER A T THE TUNER RF IN.
'PLIED VIA R34 TO U6C.
"ANNEL
CHANGE,
0 V
VSWR
DETECTOR
=TZ
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J
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use ON TO DETECT '.5"
VSWR
F
4.3 V TO DETECT2,'
VSWR. 0 VOTHERWISE
G
4.3 V TO DETECT 1.5"
VSWR, 0 V OTHERWISE.
M
IF AN A CHANNEL
IS SELECTED,
THE RADIO Ap.
PLIES A + TO THE ANT TUNE LINE. U5F APPLIES
A LOGIC
LOW
TO U8.3,.
IF A B CHANNEL
IS
SELECTED
ANT
TUNE LINE
VOLTAGE
IS LOW,
U5F A PPLIES A LOGIC HIGH TOUB.3,.
RZ7
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LEVEL
RH
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L
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ANDazo
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SASE VOLTAGE
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0 no
OPEN RELA Y
3.2VIFOI.'SOFF
D
DURING
TUNING
SEOUENCE.'
IF
RF
INPUT
DROPS
BELOW'
WATT,
UB-Z GOES
LOW
TO
TURN
OFF
USA, WHICH
IN
rURN
srops
THE
TUNING
SEOUENCE. IF RF INPUT RISESASOVE
7 WA TTS. UB-'
GOES
LOW
TO rURN
OFF USA.
WHICH
IN
TURN
STOPS
THE
TUNING
SE.
OUENCE.
c
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SW A'
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TO
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AND 021
(VI<
R85'
7.Z0
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TO 018
AND all '"
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ZI P20
VCc'O
TO L4Z
TO 019
AND alz
CZ50/C50
Z2 PZI
P2536
TO azo
AND 013
C500/C'00
2.
PZZ
'J/O C SHUNT
TO OZ I ANO alA
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TO
U8-'5
AND azz
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R8"
R7
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OUTPUT OF U6C IS 5 V, UNTIL
THE INPUT
VSWR
IS THE SAME
AS THE VSWR
THA T THE TUNER
MICROPROCESSOR
IS TUNING
FOR, 4".
2".
OR
'.5..1 AS DETERMINED
SY U8-31. U8-32.
WHEN
THE APPROPRIA
TE VSWR IS ACHIEVED.
ua..3IS
0 V.
\J.
TUNE
POWER DCTECTOR
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TUNE 33 P 16
USA
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0 V WHEN RF' INPUT POWER IS SETWEEN
, AND
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CAP.
PHASE..
0 V
IND.
PHASE..
5 V
..
0.2V
GROUNDING TPI1
AND
TP,2
ENERGIZES
..
KB-K21
FOR SERVICING.
.,
TUNE
LINE
CIRCUIT
-6
WHEN
U8-33
GOES
LOW.
U7.15 GOES
HIGH.
HIGH
IS APPLIED
TO usa.
usa
APPLIES
A LOW
TO ANT TUNE LINE TliJ
ACTIVA TE RADIO
TUNE
MODE.
O.B V RELA Y CLOSED
13.B V RELA
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TO a8-_L8
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