Comtech EF Data CLC-10 - Manual (Page 34)

CLC-10 Comtech LPOD Controller Handheld Terminal M&C Accessory Revision 3
Serial-Based M&C using the CLC-10 MN-CLC10
3–2
3.3 Key Operational Parameters
The back of the CLC-10 is labeled with a quick reference that lists frequently used remote commands and queries. Detailed information
about the remote commands and queries mentioned on the back label of the CLC-10 and in this section is provided in Sect. 3.5 Remote
Commands and Queries found later in this chapter.
3.3.1 RF Input Level
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 54 dBm – 75
dB=-21 dBm 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 can be
accommodated. The maximum input level should never exceed 15dBm, or permanent damage to the unit may occur.
3.3.2 Attenuator Control
The SSPA gain can be attenuated over its specified range by exercising the
ATT
command. The details for the format of this command
are found later in this chapter.
3.3.3 Mute Control
The SSPA may be muted via software or discrete control. Exercising the
MUT=1
command will “software” mute the unit. The SSPA also
may be “hardware” muted by pulling Pin ‘S’ on the J6 | COM1 Discrete control connector to ground (see Chapter 2. SYSTEM
CONNECTIONS, INSTALLATION AND OPERATION in the SSPA manual).
The Mute command provides over 60 dB of RF on/off isolation. However, the Mute command only turns off the first few low power
stages of the amplifier, the high power stages remain on. By allowing the higher-powered transistors to stay on, the SSPA remains in
more thermally stable state should the mute condition be removed.
Should you choose 7to completely turn off the bias to the entire amplifier (perhaps to conserve energy in a redundant system), both the
MUT=1
and
AMP=0
commands should be executed. For normal transmit operation,
MUT=0
and
AMP=1
are required.