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5.3 .9
PHASE LOCKED LOOP 6 ADJUSTMENT
Adjustment cίιιι tιπΙs fπι I' LL 5 αιπ 1υυα tc ι) off ΜύdυΙαιίυιι
B oar d C3162 an d module Μ29-2 ( F ig ure 5-6), wh ile t he
MOD ΤΡ is located tin ιιηιΙer τίιΙιι σΙ (h r εΙιιτ%ίτ Ι Fιgιιιε
5-51 . Connect α frequency counter to the front panel RE
OU T connecto r αη d α
d
igital volt m eter to
the
M OD ΤΡ .
Set
t
he front-panel controls as follows :
FRED VERN I E
R
0
k
1-Ιι
Frequ ency selector
2.000 MHz
M OD ULATIO N MOD E
FM x10
M OD ULATIO N FRE D
DC
M OD ULATIO N FM 'ΑΜ
Full up
OUTPUT VERN I ER
Fu ll εω
OU T PU T Step Ατιeπιιαιο r
+10 dβm
ΝΟΤΕ
M
o d ulatio n Board C316-2 contains α Size Adj (C) and α
Balance Adj (D) w
h
ic h are factory adj ustments . DO NOT
change
t
h e settings of these two controls.
Adjust
M
odu lation B oa rd control ( Α) fo r α +5 .00 1 .01 V
rea ding on the voltmeter. Set the ΜΟ DU Ι ΑΤΙΟΝ FM 'AM
sli
d
er f u ll down . T he voltmeter
s
hou ld i ndicate 0 V -20
mV . Disconn ect the voltmete r from the
M
OD ΤΡ ,
Adjust
Μ 29 .2
control
1 Β 1t ο
produce
α
f
reque n cy coun te r
rea d ing of 2.000 MHz +100 Hz, Set the
M
OD ULATIO N
FM/AM slider full up and adjust
M292 control (Al (of a
counter rea d ing of 2.100 MHz i100 Hz .
Set t h e
M
OD UL ATIO N M OD E to F Μκ 1 an d
a
dj ust
M
odu-
latio n Board
control (Β )
for α counter
r
ea ding of 2.010
MHz ±100 Hz .
5.3 .10
METE R B OA RD CA L I BR ATIO N -C315
To
a
djust the ou tp ut METER, t h e unit m ust
r
est on its
b
ottom su rface (normal operating
p
osition) .
M
o mentarily
turn off
p
ower to the instrument and mechanically ιe ιο
t
he outpu t ME T ER with the front-panel ze ro adjust screw.
The ME TER n eedle s h ould bisect the
d
ot at the left end of
the ME TER scale . Restore power to t he instrument an d
allow it to stabilize.
Set t
h
e O U TP UT VE βN I ER fully εεω: then, adjust Meter
Board
p
ot ( Β )
u
ntil t h e ME TER needle again
b
isects the dot
at th e left end of t h e METER scale. See
F
igu re 5-6 fo r
t
he
locations of th e
M
eter Board pots . Set the OUTPU T
VERN I ER comp letely cω and a
d
ju st
M
eter Boa r
d
pot (Α )
for α +3
d
B m ou tp ut ME TER reading.
Set t h e front-panel controls as follows:
FRED VERN I ER
CA L
Fre qu ency selector
50 .000 MHz
MOD UL ATIO N MOD E
CW
M OD UL ATIO N FRED
NIA
MOD UL ATIO N IM/AM
minimum
OUT PUT VERN I ER
Fu ll ew
OUT PU T Girl) ΑΙιcιιυmιιι
ι ΙΟ d8 πι
Calibrate t he power mete r and its thermistor or
p
ower
se n sor. Set th e
p
ower meter to the +15
d
β m range ; Then
connect the ther mistor or se nsor to the instrument RE
OUT co nn ector .
Adjust Meter βπα rd
p
ot I F ) for α +13 dBm power meter
reading. Set t he O UTPU T VERN I ER fo r α -7 dB rea
d
ing
on the output ME T ER and set the
p
ower meter to t he +5
d B m range. Adju st
M
eter Board pot (ΕΙ for α +3 dB m
power meter
r
eading. Again set th e
p
ower meter to
t
h e
+15
d
β m range and turn the OUTPU T VERN I ER fully cw .
Repeat th is proce dure un til the +13 and +3 dBm power
mclci
r
eadings me obtained ωίιΙιπιιι
f
urther αλ jιι s(mεπ t of
Μmει βπαι d pots ( Ε) an d IF)-
Set t h e OUTPUT Step Atte n uator to 0 dB m an d
t
h e power
meter 1ο
t
he +5 dBm range . With
t
he OUTPU T VER
N
IER
com p letely cw, adjust Meter Board pot (C) for α +3 dB m
ρηωε r meter reading. Set the O UTPU T VERN IER for α 6
d
Bm iαα dίη g an the output ME TER and set the power
meter to the -5 dBm ra nge . Adjust M eter Board pot (Dl for
α -6
d
Bm power
m eter
reading. Repeat t his procedure untsi
t
he +3 and -6 dB m
p
ower meter
r
ea d i n gs are obtained
with-
out further a
d
justment of Meter Board pots (C) and U.
Set instru ment frπη 1-panel controls α5 follows:
Frequency selector
100 .000 MHz
M
O
D
UL ATION MODE
AM
MODULATION F RED
DC
MOD ULATIO N FM/AM
Fu ll
d
own
OU TP U T Step Atte n uato r
0 dS m
Set the powe r m eter to its 0 dBm range and adjust the
O UTPU T VERN I E R for α -3 dBm readingo n power meter.
Set th e
p
ower meter to the +5
d
8m range and slide the
MO
D
ULATIO N FM/AM slider fully up . Adjust
M
eter
B oar d pot (G) fo r α +3 dB m reading on t h e
p
ower
m
eter.
Τ
h
ίτ tin increase correspon
d
s If, 100'% AM .
5311
DOWN -CONVE RSION ADJUSTMENT - Μ 115
(MODEL 3002 ONLY)
Set t h e instrument front- pa nel controls α 5 f ollows :
FRE
D
VE RN I ER
CA L
Freq uency selector
001-000 MHz
MOD ULATIO N MOD E
C
W
MOD ULATIO N FRED
N/A
M
OD ULATIO N FM/AM
mini mum
OU T PU T VERN I ER
Fu ll εω
OUTPU T Step Attenuatoι
0 dBm
5-5
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