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Lf)
-
r -
......
-
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.......
b.
Connect the Model 670SM to the Model 71 7 A by plugging the
output
cable
(the other end of which is plugged into
the
Model
670SM oscil-
lator)
into the terminal assembly on the Model 71 ?A control
panel.
c.
Plug
the power cable (connected to the Model
71
?A
on the
rear
of
the instrument)
into a power source (115
-
volt,
50
-
60 cycle).
Turn
the POWER switch to
the
on position.
d.
Set BEAM
VOLTS at
800, MOD. SELECTOR at CW.
e.
Set REFLECTOR RANGE
at
600.
£.
Set BEAM
VOLTS at proper voltage (approximately
850 volts for
the Model
670SM;
see Table at end
of
section for beam voltage for
other oscillators).
g.
On the
Model
670SM, set
the
FREQUENCY
-KMC
dial at
2.
6 kmc.
h.
Adjust
BIAS VOLTS to obtain beam current
of 14-16
ma., with
the MOD.
SELECTOR switch (on Model
717 A) in the CW position.
i .
On the
Model 670SM,
set
the SELECTOR
switch
at
MANUAL.
J.
Set MOD.
SELECTOR (or1 Model
717A) to
G-INT.
MOD.
k.
Set MOD. AMP. (on
Mode
l
717A) to approximately
full clockwise
position.
Waveguide
-
Connect
the waveguide in the following
sequence
:
,
1.
To a Model S752D
(20
-
db
couple
r)
Dire
ct
ional Coupler connect a
Model S752C
( 10
-
db
co
u
p
ler)
Directional
Coupler
,
back-to
-
back. The
Model S752D
coupler samples the
incident
power;
the Model S752C
coupler samples the reflected power.
NOTE
:
A
10-db
di
rec
tional
coupler rnay
be used to sample the in-
.
cident power,
if
desired, but an advantage
in accuracy may
be
gained by the use
o
f a
2
0
-
db coupler
in the incident channel
of the system.
2.
Connect
a Model S281A Waveguide
t
o Coaxial
Adapter to the input to
the incident
coupler
(Model S752.D}.
NOTE
:
If a
waveg
uide
attenuator
is
being used (Model
S380A Wave-
guide Calibrated Variable Attenuator, S370B
or C, or S375A),
connect the attenuator between the
Model S281A Waveguide
to
Coaxial Adapter and the input
to the incident coupler
(Model
S752D).
Set
the
wave
g
uide attenuator
for 10-2.0
db
lass.
-2.
5
-
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