V L F > H F R E C E I V E R S
f
R & S E K 8 9 5 / R & S E K 8 9 6
User Manual
f
Control Type
3.1.11 Control Type
The type of control can be selected by actuat>
ing softkeys in the control type menu (R&S
EK!895) or the control type keys (R&S EK 896).
The currently effective type of control is dis>
played in the control type field.
The following types of control are available:
f AGC (automatic gain control)
f MGC (manual gain control)
f A+M (combined control AGC+MGC)
f A+D (combined control AGC+DGC)
Depending on which key has been actuated,
control is carried out
automatically (AGC Æ control voltage set by
signal processor),
manually (MGC Æ control voltage set via
HF control),
digitally (DGC Æ DGC value entered via
the numeric keypad).
A combination of these control types is also
possible.
Digital control is equivalent to manual control
with the exception that the control voltage can
be stored.
For the type of control AGC, the bargraph
indicates the current receive level.
For the type of control MGC, the bargraph
indicates the HF voltage set via the HF control
(constant gain).
For the type of control A+M, the bargraph
indicates either the control voltage set via the
HF control (receive level < control voltage) or
the current receive level (receive level >
control voltage).
For the type of control A+D, the bargraph
indicates the digital threshold entered via the
numeric keypad (constant gain).
In all four cases the display bargraph range is
from 0 to 120 dBoV with a resolution of
5 dBoV.
If in the control types A+M and A+D respec>
tively the receive level exceeds the set control
voltage respectively the programmed DGC
value, the automatic gain control (AGC) pre>
vents the receiver from being overmodulated.
3.1.11.1 Control Type Menu (R&S EK 895)
Upon actuation of softkey GAIN the control
type menu is called up. By pressing
softkey AGC or
softkey MGC or
softkey A+M or
softkey A+D
the respective control type will be set.
Upon actuation of softkey A+D a DGC value
can be entered in addition (see 3.1.11.3).
Upon actuation of softkey A+M a control volt>
age can be entered in addition (see 3.1.11.4) by
using the HF control.
3.1.11.2 Selecting the Control Type
(R&S EK 896)
Actuate the relevant control type key (19) sev>
eral times, as necessary, until the desired type
of control is displayed.
Desired
control type
Display Actuate key(s)
AGC MGC
A+D
A+M
AGC + AGC
AGC
AGC
MGC
1)
AGC
A+D
A+M
MGC + MGC
MGC + MGC
MGC
A+M
1)
AGC
MGC
A+D
MGC
AGC
MGC
A+D
2)
xxx DGC
1)
Set control voltage acc. to 3.1.11.4.
2)
Alter DGC value acc. to 3.1.11.3
6164.0717.02_01
> 3.26 >
To Next Page
Loading...
