DATATEC HAMEG HM8135, Руководство пользователя

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Types of Modulation
4 .4 FSK modulation
After selecting F0 or F1 (FSK MENU) with the context sen-
sitive key
5
, the display shows:
– stp + cur
Fsk1: 522.000000 MHz
– stp + cur
Fsk0: 512.000000 MHz
A new value of Fsk0 or Fsk1 can be entered from the data
keypad
11
or modified by the rotary knob
10
or by one of
the four context sensitive keys
5
. For more details, refer
to paragraph 3.6 SETTING PARAMETERS.
The skip frequency Fsk0

Fsk1 or Fsk1

Fsk0 may be set
from:
❙0 to 10 MHz (16 MHz - 3000 MHz)
❙step 1 Hz
The return to the previous menu is possible by pressing
the PREV. key
3
and the return to the main display by
pressing the ESC key
13
.
Example 12:
For modulation FSK, the display shows:
1190.000000 MHz FSK
1200.000000 MHz Ext
Fsk0: 1190.000000 MHz
Fsk1: 1200.000000 MHz
4 .5 PSK Modulation
After selecting PH0 or PH1 (PSK MENU) with the context
sensitive key
5
, the display shows:
– stp + cur
– stp + cur
Psk0: –10.00rad
Psk1: 10.00rad
A new value of Psk0 or Psk1 can be entered from the data
keypad
11
or modified by the rotary knob
10
or by one of
the four context sensitive keys
5
. For more details, refer
to paragraph 3.6 SETTING PARAMETERS.
The skip phase Psk0  Psk1 or Psk1  Psk0 may be set
from:
❙-3.14 rad to 3.14rad (<16 MHz)
❙-10 rad to 10 rad (16 – 3000 MHz)
❙step 0.01 rad
The return to the previous menu is possible by pressing
the PREV. key
3
and the return to the main display by
pressing the ESC key
13
.
Example 13:
For modulation PSK, the display shows:
1200.000000 MHz PSK
+13.0dBm Ext
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
19
at the rear panel. When the GATE signal is at the state
ACTIVE (optional level 1 or 0), the carrier is present at the
output.
After selecting GATE (MODULATION MENU) with the four
context sensitive keys
5
, the display shows:
Press one of the four context sensitive keys
5
for selecting
the active level and for turning the gate ON or OFF. Two tri-
angles
 point out the options , , and ON or OFF.