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LBIS
LO72
SOUELCH CIRCUIT TEST WITH 7 kHz
SIcNAL
T:-
"IiNARY
STEPS
"
:-etrecerverwth1000uvurmod!atedsgnal.
]
::-elch
Adlust at
maxrmum sque ch.
:
!.'rn
tor pushbutton in OUT
posit on.
!
,ie
l0
megohm
probe
SOUELCH CIRCUIT
CHECKS
WITH
NOISE
PRELII\,4INARY STEPS
I
No
lnDut
s
gnal
apolied
2
Squelch Adlust e!
max
m!m
squelch.
3.
Monllor
plsnbutlo.
'r
OUT
pos
lion
1
Use 10
negonm
t.c5e
AUDIO CIRCUIT
CHECKS
PFELIMINARY
STEPS
1
Apply
1000 uv
on lrequency signai
wth
1000 Hz
modulatron and
3
kHz dev
ation to antenna
iack
J60l
2
N4on
tor
plshbutton
N
3.
Oltput
sel
for 3-Watts
(3
46
VRMS) into 4 ohm
toad.
4.
Use
1 megohm
probe
e
d:
:0 ISEC/DlV
iE:-
0.1
V/DlV
i:r.PP)
I
{:.50lSEC/DlV
r:.-1.
2
V/DlV
^
{i.50ISEC/DIV
I::T.
1
V/DIV
0
-€a.50ISEC/DlV
IE'T.
2
V/DIV
€_2
ir
P
P)
9r_.--
tsO
.50jrSEC/DlV
vE3T,1
V/DIV
.25VPP)
o__
*CR.50rrSEC/DlV
'I:RT.
1
V/DIV
5.5 VDC)
;-;,
F*l
' 2avPo'
L-----l
ffic@I
IIIffiT
-
EH-HEI
l;iJi.;;;
t=*l
@=-
HOR. 1t\4S.'D V
VERT. 0.5
V,
DiV
l'2v
P.P)
o=_
HOR.1
MS/DIV
VERT,2 V/DIV
{6.2
V
P,P)
e____
HOR.
1
MS/D]V
VERT 1V;'DIV
126VPP)
@__
HOR.
1 lVlS/DtV
VEFT.1 V/DIV
(5.6 VDC)
@-=____--
HOR.
O.2 I\NS/DJV
VERT,
20 I\,lV/DIV
(84
]\1V P
P)
@F=-==-
HOF.0.2
1\,1S/DrV
VERT.20
IV]V/DIV
(84
i\4V P
P)
O=___
HOR.0.2
MS/DIV
VERT,2 V/DIV
(9.8
V
P P)
@F-----.----.-.-..-.-
HOR.0.2
tu1S/DtV
VERT,
20 ]\1V/DIV
{86 MV
P
P)
RECT
IVER
Issue
I
AU
D
IO
AND
SQUELCH
WAVEFORM
CHECKS
t--
HOR.0.2
]VS/DiV
VERT,0.2 V/DIV
(0.92
V
P-P)
l9
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