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Sencore CB42 User Manual

Sencore CB42
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2.
Connect
the
output
of
the
RF
_IF
OUTPUT
jack
,.
Set
the
MICROVOLTS
OUTPUT
controls for an
to
the
receiver',
antenna
jack
u,ing
the
supplied
output
of
1
uV
(a.l
and 10)
RF cable.
9.
Set
the
receiver's volume
control
for a reading
of
3.
Conned
the
audio
output
of
the
receiver
to
the
1.00
On
the
DIGITAL READOUT.
SPEAKER SUB
input
of
the
CB42 using
the
NOTE: If
1.00
cannot
be
obtained,
}eave
supplied
audio
cable.
Set
the
SPEAKER
SUB
the
volume
control
at
maximum
and
U!Ie
switch
to
the
proper
impedance
to
match
the
this reading as
the
reference for
Step
11.
output
of
the
receiver.
4. Set
the
CB
CHANNEL TUNER to
the
same
10. Switch
the
RF
TUNER
to
the
nezt
adjacent
ch.annelll$
the
CB
receiver.
channl'l above
the
one being tested.
NOTE:
Only
use Channels
2,
5,
6,
9, 1O,
11.
lncreage
the
MICROVOLTS OUTPUT cont.rol
13, 14,
17,
18,21,
or
27-40
for
adjaeent
for
II.
reading
of
1.00
on
the DIGITAL READ.
channel
l'eJeet:lon
tests
Since
other
chan·
OUT.
nels have
mo
....
than
the
normal
10
KHz
12. Using an electronic calculator, slide
Nle,
or
the
spacing
between
channels.
,.
Set
the
internal audio generator
to
1000
Hz
and
dB table found in
the
back
of
the
CB42 Speed
Test
Setup
Booklet,
calculate
the
dB
ratio
of
the
AUDIO MODULATION switch to
30%,
tho
adjacent
channel setting
of
the
MICRO·
6.
'«
the DIGITAL READOUT SELECTOR
to
VOLTS OUTPUT
control
to
the
1 uV reference.
the
AUDIO WA'M'S pOllition.
13.
Repeat
steps
10.12
for
the
lower
adlacent
chan·
7.
Set
the
reeeiwr's
volume
control
to
maximum
nel. The adjacent channel
....
jection
is
the
dB
gain,
and
squelch
to
minimum,
ratio
of
signab
that
ga~
the
lo~st
dB
ratio.
AGe
•
••
.,
-.
I
/'
"""
• J
•
RF
INPUT
(uVl
~
..
•
-
.-
It.''
-
Fig.
32-1'ypical
reeeiver
AGe
curoe.
~
o
o
•
To
teit
the
operation
of
the
AGe
circuit:
1. Supply
the
proper
pown
to the
CD
receiver.
2.
Connect
the
output
of
the
RF·IF
OUTPUT jack
to
the receiver's
antenna
jack using
the
supplied
RF
cable.
.'r_he
EtA specifif!l;
that
the
AGe
circuits
should
mllin.
tajn
the
output
of
a re<.:elvirwiUiln
3O"i!'B
with
a sig·
!laltnput
range
on-:\iY!.hrough50K
uV. A typiCal
AGe
reeei~r
WIVe
is
shown
In
Fig.
32
.
The
AUDIO
WATTS function
of
the
CB42
~Il
quickly
show
that
a receiver
is
within EIA specs with a
test
of
the
dynamic
range
of
the
receiver.
8.
Connect
the
audio
output
of
the
receiver
to
the
SPEAKER
SUB
input
of
the
CB42 using
the
supplied
audio
cable.
Set
the
SPEAKER
SUB
switch
to
the
proper
impedance
to
match
the
output
of
the
nldliver.
4.
Set
the
CD
CHANNEL
TUNER
to
the
same
channel
as
the
CB receiver.
5.
Set
the
internal
audio
generator
to
1000
Hz
and
the
AUDtO MODULATION switch
to
30%.
6,
Set
the MICROVOLT OUTPUT
controls
to
pro<-
vide
SOK
uV
of
signal
(xlOK
and
6).
7.
Set
the
DIGITAL
READOUT
SELECTOR to
the
AUDIO
WATIS
pocition.
8. Adjust
the
receiver volume
control
for
a reading
of
2.00 Watts
with
squelch
at
minimum.
9. lWduce
the
output
of
the
RF
GENERATOR
using
the
MICROVOLTS
OUTPUT
controls
until
the
DIGITAL
READOUT
indicat.es
0.20
Watts.
10.
Without
changing
the
MICROVOLTS
OUTPUT
controls, re-adjust
the
re<.:eiver's volume
control
for
a second reading
of
2.00
(at
this
point
you
have
found
the
point
at
which
the
sensitivity
curve
is
at
·10
dB).
11.
Repeat
steps 9
and
10,
which give.
the
.20
dB
point.
31

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Sencore CB42 Specifications

General IconGeneral
BrandSencore
ModelCB42
CategoryMeasuring Instruments
LanguageEnglish

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