Rohde & Schwarz SU 4200 - Meaning of Parameters

R&S SU 4200 Configuring with the R&S ZS 4200
6125.0226.12.01 3.10
Parameters Value range Default value Properties
USB Connect Warning Disabled/Enabled Disabled C
Ext VSWR Warning Warning/NOGO Warning C
TX Power Low Warning Warning/NOGO Warning C
VSWR Warning Warning/NOGO Warning C
PSU Fan Warning Warning/NOGO Warning C
Main Fan Warning Warning/NOGO Warning C
Inactive Warning Disabled/Enabled Disabled C
User Contact Warning Disabled/Enabled Disabled C
3.3.2 Meaning of Parameters
Default se tting descr iption\Defaul t setting des cription "Radi o".doc
TX Audio Level
This parameter refers to the modulation input (connector X5.2/3). With the
default setting, the modulation sensitivity is 0 dBm – which means that at
an AF level of 775 mV at this 600 ohm input, the AM transmitter is driven
and modulated at 90 % modulation. The input can be configured from
 30 dBm to +10 dBm in accordance with the line infrastructure and the
incoming signal levels. The sensitivity is greatest at  30 dBm, which
means that the full modulation of 90 % is achieved even at a low level.
TX Output Power
Level Low
Using this parameter, you can define the transmit power between 5 W and
20 W. This value is then adopted with the Low setting (see chapter
3.4.7.2).
TX Output Power
Level Normal
Using this parameter, you can define the transmit power between 5 W and
50 W. This value is then adopted with the Normal setting (see chapter
3.4.7.2).
TX AM Modulation
Depth
The modulation depth for the AM modulation can be set.
When the automatic level control (see TX Audio ALC parameter) is
activated, the set AM modulation is ensured over a dynamic range of
±15 dB at the TX audio level interface (X5.2/3).
Note: The AM modulation should be left at 90 % all the time, since the
radio link is best at this value.
TX Audio ALC
The automatic level control for the audio modulation can be switched on
and off.
When this function is activated, the set AM modulation depth (see TX AM
Modulation Depth parameter) is ensured over a dynamic range of ±15 dB
at the TX audio level interface (X5.2/3).
Note: If an automatic level control is active in the system, then the level
control of the radio should be switched off.
PTT Timeout
A time limit can be set for the transmit time. This prevents the radio from
transmitting for an unlimited amount of time if the PTT key is pressed
(stuck). With a value of 0 s, the time limit is switched off.