Wavetek 2001 Instruction Manual page 18

OPERATING INSTRUCTIONS
Model 2001
3.6.1 OUTPUT AMPLITUDE CONTROL
(AM MODULATION)
Normal internal control is provided by a jumper wire con-
nected between pins 5 and 6 of the REMOTE plug as
shown below.
REMOTE PLUG
TO RF OUTPUT AMPLITUDE
-q I
I
CONTROL CIRCUIT
FRONT PANEL
VERNIER OUTPUT
CONTROL ( 0 to 2 0 d B )
T o provide external control, remove jumper wire and con-
nect an external OUTPUT Control as shown below. The
RF OUTPUT is a linear function of the programming vol-
tage as shown in Figure 3-6.
EXTERNAL
REMOTE PLUG
Y E
4 5 6
Y Y Y
-4
I
1
TORFOUTPUT AMPLITUDE
CONTROL CIRCUIT
FRONT PANEL
VERNIER OUTPUT
CONTROL ( 0 to 20dB)
-
VOLTS
0 1 2 3 4 5 6 7 8 9 1 0
-5
- 3
R?
OUTPUT PEAK +I0
J
C"P
dBm
Figure 3-6. Program VoltageIR
F
Output
TO
External
Modulatinq
To provide AM MODULATION, connect as shown at right. Sourw
The low frequency modulation will be limited by the
reactance o f capacitor C1. Lower frequency modulation,
Modulation
down to DC, can be provided with a modulating source
A t Moximurn
output
having a DC offset. I n this case, resistor R1 is omitted. I n
all cases, the peak modulating voltage plus the DC offset
must be within the limits of -18 t o +2 volts, as shown in
Figure 3-6, or distortion will occur. The modulation fre-
quency limits the maximum useable percentage of modula-
tion as shown in Figure 3-7. This graph was obtained with
the
DC
level set t o
-8
volts.
OPERATING INSTRUCTIONS
3.6.1 OUTPUT AMPLITUDE CONTROL
(AM MODULATION)
Normal internal control is provided by a jumper wire con-
nected between pins
5
and 6 of the REMOTE plug as
shown below.
REMOTE PLUG
2001
~
REAR PANEL)
~ ~
"' C """
_ _ _ _
\~
4 5 6 \ - - - - - -
-18V
J
I
TO RF OUTPUT AMPLITUDE
CONTROL CIRCUIT
10Kt FRONT PANEL
VERNIER OUTPUT
CONTROL (0 to 20dB)
VOLTS
-18
-16
Ul
z
-14
a::
0
-12
l-
e
w
-10
:J
a..
a..
-8
<f
1/
w
-6
Cl
<f
~
-4
0
V
/.-
,
,
>
~
-2
<f
a::
Cl
0
0
cr
a..
,
+2
,
V
Model 2001
To provide external control, remove jumper wire and con-
nect an external OUTPUT Control as shown below. The
RF OUTPUT is a linear function of the programming vol-
tage as shown in Figure 3-6.
'/
i/
EXTERNAL
OUTPUT
t
CONTROL
-:- RO:EMOTE PLUG
2001
REAR PANEL)'
\ 4 5 6 "\ ..... _ _ _ _ _
V
~
-18V
J
I
TO RF OUTPUT AMPLITUDE
CONTROL CIRCUIT
10Kt
FRONT PANEL
/
VERNIER OUTPUT
CONTROL (0
to
20dB)
o
.1 .2 .3 .4 .5 .6 .7 .8 .9
1.0
-(, -3·5
R~
OUTPUT PEAK +10
dBm
Figure 3-6. Program Voltage/R F Output
To provide AM MODULATION, connect as shown at right.
The low frequency modulation will be limited by the
reactance of capacitor C1. Lower frequency modulation,
down to DC, can be provided with a modulating source
having a DC offset. In this case, resistor R1 is omitted. In
all cases, the peak modulating voltage plus the DC offset
must be within the limits of -18 to
+2
volts, as shown in
Figure 3-6, or distortion will occur. The modulation fre-
quency limits the maximum useable percentage of modula-
tion as shown in Figure 3-7. This graph was obtained with
the DC level set to -8 volts.
3-8
To
External
Modulating
Source
--:2:C:0~V:':P::"--:-to--=-P
----, Ex terna I
for
~~C:I~~ion
100 Percent Control
Modulation 4-l
At Maximum Cl
Output
2001
REAR PANEL)
REMOTE PLUG
_ _ _ _ ..... , 4 56
;"j J
r
TO RFOUTPUT AMPLITUDE
CONTROL CIRCUIT
10K
t
FRONT PANEL
SETty VERNIER OUTPUT
-8V ; CONTROL( 0 to 20dB)