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I NTROD UCTION
T
his option provides α constant amplitude
A
u xilia ry
R
F
O
utpu t signal
at
the
r
ear
panel
of the signal ge n erator.
T
he amp litu
d
e 1-10 dBm) of
t
h is signal is sufficient to
d
rive most freq uen cy counters,
T
h is auxiliary sig nal does
not contain amp litud e modulation ; h owever. it
d
oes
contain frequ ency modulatio n.
This
f
acto ry-installe
d
o
p tion entails c hangi ng the
M
9W
Oscillator to an
M
9
W
-1, t h e a ddition of an Μ 37 Amplifie r
m odule, harnessi ng, and add itional cabling to the
r
ear
panel . The addition and ope ration of th is option has no
effect on the
o
peratio n or
s
pecifications of t h e sign al
generator.
SPE CI FICATIO N S
Frequency
R
ange
1 to 520 MHz
L
evel
-10
d
Bm -.5 d8 (70 m V)
H
a r mo n ic output
25
d
8c from I to 620 MHz.
OPERATING INST RU CTIO NS
To use
t
he A uxiliary RF Output,
d
isconn ect the 50 Ω
ter m inatio n
on
t
he rea r p a nel and co nn ect α frequ ency
coun te r or other mon itoring
d
evice with α 50 Ω coaxial
cable.
T h e Auxiliary RF Output ca b le should be kept as
short as
p
ossi ble . The outpu t is co ntrolled
b
y α
r
ear- pan el
on/off switch.
IMPOR TAN T
When not is use, te rminate the Auxiliary RF O u tpu t with
t
he 50 Ω terminator
s
upplied.
ΝΟΤΕ
Alt h o ugh
t
he reverse isolation of the Auxiliary RF
O
utput
is approximately 30 dB, α signal that ί5 co uple d into the
OPTION 4
A
UXI L IA RY RF
O
UTPU T
Auxiliary
R
F Outpu t coul d be coup led to
t
he main RF
output on
t
he inst rument's front panel.
For examp le,
sub- harmo nic signals at α counte r's input can
b
e coup led
t
hro ugh the instru ment and ap plied [ο
t
h e
d
evice und er
test .
ΝΟΤΕ
If Option 4 is used on
M
odel 3002, 3004, or 3006, it will
functio n normally from I to 520 MHz,
However, at
fre qu e ncy settings of 1 to 999 kH z, t h e Auxiliary AF
Output frequencies will
r
ange from 10.001 to 10.999 MHz.
CI RC U IT DESC RIPTION
T
he Μ 37 modu le con tai n s α wi d e ba nd am p lifier, m onitor
diode, error amp lifier, and voltage va ria ble attenu ato r.
The in put signal to
t
he Μ37 modu le is fe d thru the VV A to
amp lifier ICI . The appr oximate gai n of th e a mp lifier is 13
dB from 1 to 520 MHz-
T
he monitor
d
io de, C R2,
d
etects
th e outpu t fro m
t
h e wide
b
and
a
mp lifier .
This
d
etected
level is compared to α DC refe r ence by t h e er ro r amp. IC2.
The outpu t of the err or am p is fed to
t
he PIN
d
io d e (VV A)
αττeπυατοι which changes t he in pu t level to
t
he wi de b and
amp lifie r un til t h e monitored signal
p
roduces α DC level
equ al to
t
he refere n ce level-
T
h is refe r ence level is a dju ste d
by
R
5, the
O
utpu t
L
evel cont rol,
T h e output
i
mp edance is provided
b
y the resisto r,
R
2,
co nnecte d between
t
he monitor an
d
t
he RF
o
utput
co nnecto r.
M
AI NTENANCE
T
he only maintenance fo r
t
h e Auxiliary RF Output is a
p
erio dic chec k of the output level. If α malfunction occurs,
α troub le can be localized and re paire
d
wit
h
t
he aid of the
theo ry of operatio n and
t
he schematics.
The Μ37
Sc hematic is included in
t
h is sectio n. The
M
9W/M9W-1
Sc h ematic is locate d in Section 7 of this manu al .
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