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2.
Connect th e RF OUT connecto r to
t
he RF input of the spectrum
analyzer .
3.
Set the spectr u m analyzer to
m
eas ur e the non-harmonic content of
t
he output
b
elow 3 MHz . Set th e
b
andwi d th to 30 kH z, the fre quency
sςιαπ ρρι
d
ivision to 1 ΜΗ ?, and
t
he
d
isplay to 10 dB/div .
L
ocate the zero
refere nce at the left edge of t h e graticule, an d
a
djust the fundamental to
t
he log reference line (0 dθ) in t h e
d
is play.
4 .
Increase the setting of
t
he
f
requ ency selector in 1 MHz steps up to
3 MHz. The non harmonics below 3 MHz should be at least 60
d
8 below
t
he fundamental i<'60
d
8ε l .
R
ecor d t he maximum ηnη -harmonic rιh-
served in t he display in d0 below the fundamental on line 23 of t he ΡΤ R .
5.
Set the slwctr ι nn αιιαΙγιer to measure t h e non-harmonic content o f
t
he output
b
etween 3 and 250 MHz. Set
t
he
b
an dwi d t h to 300 kH z and
the freq ue n cy span per d ivision to 100 MHz
6.
Increase the setting of the frequency selector in 1 MHz steps
b
etween
3 and 10 MHz an d in 10 MH z steps between 10 and 520 MHz ιvhi+c
observing the sρeε tπιπι αιιαΙγιρ r
d
isplay .
U
se the table below to
d
etermine
t
he
m
aximum non-harmonic level in each of th e frequency ranges shown,
R
ecor d
t
he
m
aximu m non-harmonic level observed in eac h ra nge indicated
in the table on the ap p licable line of the P T R .
<-65 dBc in α 50 Hz to 15 kH z post-detection
b
an d widt h .
Α modu lation mete r operating in AM mode is used to
d
em o du late t he
o
u tp ut at the minimum levele r point where AM noise is maxi mum. Α
d
is-
to rtion analyzer (ope rating in level mo de) is used to increase t he
r
esol u tion
of the
d
emodu late d output of the modulation meter. The syste m is
cali brated at α 10% AM level . The 10% AM is remove d an d
t
h e resi dual
AM is
r
ead in dB below th e cali brated 10% AM level . 20
d
8 is
a
dded to
the
r
ea ding to relate w5rdual AM to the carrier.
(2) (6)
1 .
Set the instrument controls as follows'.
FRED VERN IER
CA L
F re qu ency selector
500.000 MHz
M
OD UL ATIO N M OD E
AM
M
OD ULATIO N FRE D
1 kH z
M
OD UL ATIO N FM/AM
0% AM
OUTPU T VERN I ER
-7 dB
OUTPUT Step Αττεπυατη r
0
d
Rm
2 .
Connect rh a eμιιίριη~η[ as sh own in Figure 4-2 .
NON-HARMONIC
R
ANGE
(MHz)
NON-HARMONIC LEVEL
ΙλΒε )
PTR LI NE
NUMBER
3-250
<-85
24
3-350
-'-55
25
31000
<-35
26
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