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Increasing input power beyond this level results 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.
CAUTION – Permanent damage may occur to the unit if the maximum input level exceeds 15 dBm.
5.2.2 Attenuator Control
Execute the "ATT" command to attenuate HPOD gain over a 30 dB range.
5.2.3 Mute Control
The HPOD may be muted via software or discrete control:
Software – Exercising the MUT=1 command will "software" mute the unit.
Discrete Control – When exercising the AUX=1 command, the HPOD will be muted until Pin 'S' (on the 'J6 | COM1' Discrete
Control Connector) is pulled to ground (Pin 'K'). At that time, the unit unmutes.
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 power transistors to stay on, the HPOD remains in a more
thermally stable state should the mute condition be removed.
If the user desires to 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.
5.2.4 Faults
The M&C system monitors certain key functions of the SSPA for proper operation. Should any of these operating parameters exceed
predetermined limits, the M&C system will declare a fault. Conditions that trigger a fault include:
Any power supply more than ± 10% outside its nominal value.
Either fan less than 25% of maximum speed.
I2C internal bus communications fault.
Serial-Based Remote Product Management
HPOD C-, X-, Ku-Band High-Power Outdoor Amplifier
5–2
Revision 9
MN/HPOD.IOM
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