11.
Continue
to
decrease
the
MICROVOLTS OUT.
PVT oontrols until
the
DiGITAL READOUT
indicates 0.25. This
point
is
.16 dB from the
original reading
at
50,000 uV.
SSB
RECEIVER SQUELCH
If
the receiver
meets
or
eJ[ceeds
the
EIA specifica·
tions,
the
settings
of
the
MICROVOLTS OUTPUT
con
trois should
be
leM
than
or
equal 00
the
sensitivity
point
found with
the
SSB Receiver Sensitivity
Telt.
C:.
Rf
TUNlR
T
~
"
..
~
",.~~";;)
{oJ
,..,,..,
....
:I,-,n
LJUL'L,UU
~':
..
,,~,
'
S
..
NCO
....
Of
....
,
••
~
...
".
".
.
0
'"111111>'''
,
..
'"
RF·lf
GENERATOR
AUDIO
DIGITAL
AEAOOUT
SELECTOA
::,:':0:
·'0
,
0
,:0:;..""
I
II
I
...
ICAOYOLT
DUTPUr
SPEAKER
SUI
.~
...
.
I.',
""
"':i!j)::'
::-'~::
0
~:':'.!1:i!j).O
, "
ANALYZING
OuT"uT
SIGNALS
MODEL
DIGITAL
READGUT
I_UT
SIGNALS
..
CI4Z
..........
"
•
ffJ
Fig.
42-Control
fetup
for
SSB
rquelcll test.
This tellt indicates
the
point
at
which
the
squelch
circuit opens when
set
to
the
mmmum
squelched
pooition.
To
test for squelch operation:
1. Supply the proper
power
to
the
CB
receiven.
2.
Connect
the
output
of
the
CB42's
RF·IF
OUT.
PUT jack
to
the
antenna
input
of
the
re«iver
using
the
supplied RF cable.
3.
Connect
the
receiver's audio
output
to
the
SPEAKER SUB
input
jack using
the
supplied
audio cable. Set
the
SPEAKER SUB
control
for
the
same
impedance
as
the
output
of
the
re<:eiver.
4. Set
the
CB RF
TUNER
and
the
SSB receiver's
channel selector
to
the same channel.
Ii.
Set
clarifier by performing
Gmeral
ssa Receiver
Test.
39
6.
Set
the
receiver's squelch control
to
the
mlm_
mum
squelched (open) position,
7. Set
the
DiGITAL READOUT SELECTOR to
the
AUDlO WATTS position.
8. Set
the
MICROVOLTS OUTPUT c:ontrola to
provide 50 uV
of
signal
(x
10 and
Ii).
9.
Set
the
RF·IF
CONTROL switch to
the
LSB
position.
10.
Set the receiver's squelch oontrol for
the
mm-
mum
squelch (tight) position.
11. Increase
the
settings
of
the
MICROVOLTS
OUTPVT
control.
until
the
reading
on
the
DlGI.
TAL READOUT
reads
more
than zero.
Read
the
signal level from
the
MICROVOLTS
OVT.
PUT conuoIs. This ill
the
amount
of
signal needed to
break squelch.
The
EIA states
that
thiJ;
ohould
not
~
more
than
600
uil.
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