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Sencore CB42 - Frequency Counter

Sencore CB42
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CI
RF TUNER
T
'''11111''''
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n
UUUI_.UU
a
..
NCO
"',
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o 0 0 0 0
,,,m
._
"H',
o
·'or~
IIF."
UE
..
IIIIlTOII
II
llUOlO
OllllTlll
III11llllUT
SEUCTOII
llUOlO
OUTPUT
BPEllKER
BUI
• 0
.ft
';;:'::'~'"
Fig. 4---eontrol
S<1tup
(or
Audio
OUlput.
ll
..
llLVZ,
..
lI
OUTPUT
SllI
..
llLI
MOOn
CI,n
.,
.
W
NOTE: When feeding
the
audio $i.gnal
diredly
to
the
microphone
input
using
the audio
tell
lead,
the
level
of
audio
signal
may
overdrive
the
mic pre-amp.
IllIIerting a lOOK
Ohm
resistor
in
$enes
.nth
the
red
tes~
lead will Uliually
match
the
output
impedance
of
the
generator
to
the
input
impedance
of
the
pre-arnp.
2.
Sele<:t
the
audio frequency desired
(400
Hz.
1000
Ht,
or
SSB
two.tone)
a~
the
AUDIO
sele<:tor switch.
3.
Connect
the
audio cable
to
the
desired
test
point
or
place
the
microphone on
top
of
the
rubber
cushion
on
the
Dynamic Mike Tester.
FFEOUENCY COUNTER
The
FREQUENCY COUNTER inputs
of
the CB42
allow external frequencies
of
up
to
60 MHz
to
be
measured With
the
resulting frequency indicated on
the
DIGITAL READOUT.
The
CQunter offer.; both a
50
Ohm
loaded
input
or
high-o;ensitivity 1
Meg
input.
To
use
the
50
OHM
LOADED EXTERNAL FRE-
QUENCY input:
12
OllllTllL
IIEIlDDUT
I_UT
IIl1NllLI
.........
4. Adjust
the
AUDIO OUTPUT
control
lor
an
adequate audio level.
NOTE:
When
the
SSB two-tone
i5
used
for
web
tests as
the
alignment
of
the
balanced
modulator
of
an
SSB traru-
mittff,
the
audio should
be
fed
dir'e<:tly
inlo
the
audio circuitry
or
the trail&-
ceiver rather
than
using
the
Dynamic
Mike Tester.
The
reason
lor
this is
the
lh!quency response
of
mOllt
CB
micro.
phonl!$
Ulied with
the
Dynamic Mike
Tester
will cause
the
cardll.lly balanced
leveb
of
the
two
audio signals
to
become
unbalanced which may indicatc symtoms
in
the
transmi~ter
that
are
no~
actually
present.
1.
Connect
the
output
of
the
transmitter
to
be
tested
to
the
00
OHM
EXTERNAL
FRE.
QUENCY
inpllt
jack using the supplied
RF
cable.
2.
Seleo:t
the
EXTERNAL
FREQ.,
500HM
LOAD
position
on
the
D!GITAL READOUT SELEC·
TOR.

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