Operations Manual, HPA2, Compact Outdoor SSPA
208495 REV B
49
For example, if a 50 W Ku Band Compact Outdoor amplifier is used in a system it has a P
sat
=
47.0 dBm. Therefore the maximum input power should be limited to -28 dBm. Slightly higher
input power levels will not damage the amplifier but will result in higher levels of distortion in
the output signal.
WARNING! The maximum input level should be limited to +15 dBm to
avoid damaging the amplifier.
4.3.2 RF Output (J2)
The amplifier’s output is taken from the waveguide port, J2. Caution should
be observed here to ensure that the antenna or a suitable termination is
connected to this port before operating the amplifier. The amplifier is
protected against full reflection but dangerous levels of microwave energy
can be present at this port.
WARNING! Never look directly into the RF output waveguide.
4.3.3 Amplifier Enable (Mute/Unmute) (J4)
The Compact Outdoor Amplifier has no on/off switch or circuit breaker in the AC Input path.
As soon as AC power is applied to J7, the unit’s power supplies and microcontroller are
enabled. The operator will be able to observe the forced convection cooling fans running.
However, the internal amplifier module is disabled until the Mute Line Input (J4 – Pin B) is
pulled to Ground (J4 – Pin V).
If it is desired to have the RF enabled every time the AC input is applied, a permanent
connection can be made from J4-Pin B and Pin V.
4.3.4 Alarms (J4)
A variety of alarm signals are present at the M&C connector, J4. Both Form-C relays and
open collector outputs are available. An amplifier summary alarm is available in both Form C
relay and open collector output. Detailed internal faults are available in open collector form
and include: voltage, current, and over-temperature.
4.3.4.1 Summary Alarm (J4) Form C Contacts
The Summary Alarm is accessible in both Form C relay and open collector format. The form
C relay is “energized” under normal operating conditions and “deenergized” when a fault
condition exists.
4.3.4.2 Auxiliary Alarm (J4) Form C Contacts
The Auxiliary Alarm relay is an end user alarm that can be used to signal an alarm condition
that is dependent on the state of the Auxiliary Input (J4-Pin P).
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