Wavetek 3001 Instruction Manual page 35

switc
h
es a
r
e set for "ODO,", an
d
,
if
so, triggers α
h
ex
inverter to se nd out α Ιορίε "true" to the ΜΙΟW-β and
activates the 10 MHz line to
t
he M 172and M32A . This
pr ogra ms the Μ9W for 10 MHz
p
lus t he *7kHz- switch
sαΙ 1 ίιι9, αιιd this s ις l ηΙ is led into Ι hα MIOW8 At [his
p oint, h owever , t h e signal is routed to the Μ 115 (see
Section 3 .8) . wh ere it is mixed wit h the 10 MHz re ference
τί gηαΙ from the Μ30-1 Crystal
R
ef ere n ce . The
d
iffere n ce
freque ncy from this mixi ng is simply th e "kΗτ " switch
setting, and is output back to the Μ 10W-8 and on to the
Step Attenuator .
T
he Μ 115 also contains α 20
d
8 attenuation pa d for the
input from the Μ 10W-8, and an RF
a
mp lifier
f
or the
10
MHz reference
signal T
h
e e
ff
ect of
These
stages υ to
allow th e mixer output In be
d
irectly ριοροrτίοηαι to
t
h e
outpu t from
t
he ΜΙΠW-8 . The m ixer outpu t is Ι heιι fed
F RO M
OUTPUT
AMP
3-20
IN
Ιη MHz
OUT
F
ΗΠΝΤ
PANEL
~
;ωιτι dt E
20
D
B
PAD
10
MH
z
AMP
13
I
NPU
T
ΝΑΝρ
MIXER [-r _
F igure 3-23 . Μ 115
Down
Co
n
ve r ter
i nto α 3-stage am pli fie r with complementary push-pull
output in restore the output to the Proper (-7 to +13
(IRm)
level. Potentiometer
R
3 and Ir ιmcap C20 fine adju&I
file
ηαίπ and frequency response ο1
t
he module .
If the
f
ront panel - MHz- switc h es are not set to "000
t
h e MI 15 has no function except that the 10 MHz prog , 4,1
line
f
ro m the switc h es to
t
he Μ172 an d Μ32 Α ρα ss ιη
thrisuith the M115,
ΝΟΤΕ
If
t
h e MI IS is removed for servicing, the instrument may
still be used ; however, t h e frequency fangs is
r
educed from
-001-520 MHz to 1-520 MHz. In
t
his case, pint 1 an d 9 ο}
the MI 15 module sock et must Μ ju mpered together .
COAX
5W.
ENABLE
ικ rf Ζ
<- το
Ι
949 ΚΝΖ
ΙηΜΝΖ Ρ Μ
L
INE