Fsk Modulation; Psk Modulation; Gate Modulation - Hameg HM8134-3 User Manual

Types of Modulation
4.4

FSK modulation

After selecting F0 or F1 (FSK MENU) with the context sen-
sitive key , the display shows:
5
Fsk0: 512.000000 MHz
– stp +
Fsk1: 522.000000 MHz
– stp +
A new value of Fsk0 or Fsk1 can be entered from the data
keypad or modified by the rotary knob
11
the four context sensitive keys
to paragraph 3.6 SETTING PARAMETERS.
The skip frequency Fsk0 Fsk1 or Fsk1
from:
❙ 0 to 10 MHz (16 MHz - 1200 MHz)
❙ step 1 Hz
The return to the previous menu is possible by pressing
the PREV. key and the return to the main display by
3
pressing the ESC key .
13
Example 12:
For modulation FSK, the display shows:
1190.000000 MHz
1200.000000 MHz
Fsk0: 1190.000000 MHz
Fsk1: 1200.000000 MHz
4.5

PSK Modulation

After selecting PH0 or PH1 (PSK MENU) with the context
sensitive key , the display shows:
5
Psk0:
– stp +
Psk1:
– stp +
A new value of Psk0 or Psk1 can be entered from
keypad or modified by the rotary knob
11
the four context sensitive keys
to paragraph 3.6 SETTING PARAMETERS.
The skip phase Psk0 Psk1 or Psk1
from:
❙ -3.14 rad to 3.14rad (<16 MHz)
❙ -10 rad to 10 rad (16 – 1200 MHz)
❙ step 0.01 rad
The return to the previous menu is possible by pressing
the PREV. key and the return to the main display by
3
pressing the ESC key .
13
36
cur
cur
or by one of
10
. For more details, refer
5
Fsk0 may be set
FSK
Ext
–10.00rad
cur
10.00rad
cur
thedata
or by one of
10
. For more details, refer
5
Psk0 may be set
Example 13:
For modulation PSK, the display shows:
1200.000000 MHz
+13.0dBm
Psk0: –3,14 rad; Psk1: 3,14 rad; Fmod: 1 kHz; Level TTL
Psk0: 0 rad; Psk1: 3,14 rad; Fmod: 1 kHz; Level TTL
4.6

GATE modulation

The GATE modulation is made by sampling the output car-
rier with a logic signal (GATE) and is characterised by:
❙ Duty cycle
❙ Rise / Fall time
❙ Delay time
The GATE signal (TTL level) is applied to the GATE INPUT
at the rear panel. When the GATE signal is at the state
19
ACTIVE (optional level 1 or 0), the carrier is present at the
output.
After selecting GATE (MODULATION MENU) with the four
context sensitive keys , the display shows:
5
Press one of the four context sensitive keys
the active level and for turning the gate ON or OFF. Two tri-
angles point out the options
PSK
Ext
for selecting
5
, , and ON or OFF.