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Chapter 4. CUSTOMER COMMANDS
4.1 I
NTRODUCTION
This section describes the operating features of the SSPA. A few key parameters and
procedures are summarized, followed by detailed instructions of remote control
communication commands.
4.2 RF I
L
NPUT
The required RF input level to reach the full rated output power of the SSPA is
determined by the individual amplifier maximum gain and power rating. For example, if
the test data of an SSPA rated for 250W (54 dBm) indicated a gain of 75 dB, then a
signal of :
would approximately give the rated output power. Increasing input power beyond this
level would result in an output signal with increasingly higher levels of distortion. Of
course, if the SSPA attenuation control is utilized, a higher level input signal level can be
accommodated. The maximum input level should never exceed 15dBm, or permanent
damage to the unit may occur.
4.3 A
TTENUATOR
The SSPA gain can be attenuated over a 30 dB range by exercising the "ATT" command.
The details for the format of this command are found later in this section.
4.4 M
C
UTE
ONTROL
The amplifier may be muted via software or discrete control. Exercising the MUT=1
command will "software" mute the unit. The amplifier also may be "hardware" muted by
pulling Pin S on the Com 1 / Discrete control connector (J6) to ground (see Chapter 1).
The Mute command provides over 75 dB of RF on/off isolation.
EVEL
54dBm – 75 dB = -21 dBm
C
ONTROL
4–1
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