Protek B-810 - Page 20

"EmaX'Eo
E
x
1
OO
=
percent
modulation
o
H
ll
_
:IlIHHHHHHHHHHHHHH HHHHH HHHHHHHHHHHHHHIIIHlunlIlIIHHHH
HHHHHHHHH HHHH
HH
IHIII||""H“"""""H
H
HH
HH
mv \
AVERAGE AMPLITUDE
Fig.
3-16.
FULL
CARRIER
SUPPRESSED
CARRIER
Partially Suppressed
0%
Modulation
Carrier
No
Modulation
HHHHHHHHHHHHHHHHHHE
lllllllllllllllllll
Fully
Suppressed
.
Carrier
50%
Modulation
No
Modulation
CD M
Unsuppressed Carrier
with
Modulation
100%
Modulation
m
Partially Suppressed
Carrier
with
Same
Modulation
Ovarmodulation
WWW
Fully Suppressed
Carrier
with
Same
Modulation
Modulation = B + A or ¿B-
2
A
Fig.
3-17.
AM
modulation
and
suppressed
carrier
waveforms.
If
the
AM
CARRIER
LEVEL
(22)
is
turned
around
the
middle
a
double
sideband
with
a
suppressed
carrier
is
obtained.
HHHHHHHHHHHHHH 'H‘HHHHHHHHHHHH "“HHHHHHH
Barbie-sideband output waveform
Fig. 3-13.
-21-
.c
A,
-W._...__,._«._.__r..
MW}