Wavetek 3000 - FM Modulation Procedures; Vernier Control Operations; Programming Interface

OPERATION
this is the case, add
10 dB of fixed
attenuationand turn the
RF vernier
control toward maximum . The
unlevel
light should then go out .
2 .7 .6
FM Modulation - Internal
Set
the modeswitch to
FMxl or
FMx100
and the
frequency to 400 or 1000 Hz .
Adjust the
AM/FM vernier to the desired
peak deviation .
2.7.7 FM Modulation - External
CAUTION : Input voltages
greater than
t10 VDC or 10 VRMS should not
be applied
to the external
modulation input con-
nector or damage
.may occur to internal
circuitry
of the Model 3000 .
Set
the modeswitch to
FMxl or FMx100
and the
frequency switch to external
.
Apply a 1O V p-p
signal into 600 ohms to
the external
modulation input connector .
This calibrates the
AM/FMverniercon-
trol .

The desired peak
deviation canbe
set .

For FM modulation
the upper fre-
quencylimit is 25
kHz .
33
29
25
21
17
13
9
5
MOD
T . P
7 .3V
PIN

CONNECTION
1

N .C .
2

400
3

200
4

100
5

80
6

40
7

20
8

10
9

8
10

4
11

2
12

1
13

.8
14

.4
15

.2
16

.1
17

.08
18

.04
19

.02
20

.O1
21

. oo8
22

.004
23

.002
24

.001
25

ground
26 - 31

N .C .
32

7.3V
33

-

35

N . C .
36

MOD . T .P .
Figure 2-7 . Pin Location & Identification
2-8
2.7.8 VernierControl
FM
Position
Switch the
mode switch to the
FMxl or
FMx100
position and the frequency switch
to Vernier
. Using the AM/FM vernier
output control,
frequency can be varied
in a
positive direction up to 5
kHz
in
the
xl position or 500 kHz in the
x100
position .
2.7.9
Vernier Control
- AM Position
Switch
the mode switch
to the AM posi-
tion
and the frequency switch
to Vernier
.
Using
the AM/FM
vernier control
the
output
amplitudecan be
varied . It also
enables
more than 20 mW of
power to be
obtained
over portions
of the band .
2.7 .10
Programming
Frequency
is programmable
via a rear
panel input
connector set by
standard
8-4-2-1 BCD contact
closures . A
mating
connector is
supplied with each
unit .
See Figure
2-7 for pin location
and
identification .
These connections
are
in parallel
with the front panelLever
Indicatorswitches
.

If the rear
panel
programming is used,
the frontpanel
switches should
indicate all zeros .
Rear
panel BCD
programming canbe
im-
plemented
by referring to
Table 2-1 .
100's
10's
1's
.O1's
.001's
TABLE 2-1 . PROGRAMMING
Switch TTL
Logic "0" Open >2
.2V
Logic "1" Ground <0 .4V