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208495 REV B
Operations Manual, HPA2, Compact Outdoor SSPA
The Auxiliary Input is a contact closure to ground. When this input is pulled to ground the
Auxiliary Alarm relay is energized (Normal State). When the Auxiliary Input is open circuited
the Auxiliary Alarm relay is de-energized (Alarm State).
One example usage of the Auxiliary Alarm is that it could be used to signal one of the detail
alarms (voltage, current, or temperature) by connecting the appropriate open collector alarm
output to the Auxiliary Input. This programs the Auxiliary Alarm relay to be either a voltage,
current, or temperatue Form C relay alarm.
4.3.4.3 Open Collector Alarm Outputs (J4)
The open collector alarm outputs will require external pull-up resistors (unless connected to
the Auxiliary Input). They are capable of sinking up to 20 mA current at 30 VDC. The open
collector outputs are pulled to ground under normal operating conditions and switch to high
impedance state during an alarm condition.
Low RF Alarm
: follows state of Auxiliary Input as described above
BUC Alarm
: high when amplifier’s internal regulator voltage falls below its acceptable
level
4.3.5 RF Power Detector (J4)
The RF Power Detector is an analog output voltage that is proportional to the RF output
power. The maximum output voltage is 4.0 VDC which corresponds to the maximum
(saturated) output power from the amplifier. This detected voltage is useful over a 20 dB
range of output power.
4.3.6 RF Output Sample (J3)
An RF sample of the amplifier’s output is available at J3. This is a -40 dBc coupled sample of
the amplifier’s output signal.
4.3.7 Gain Adjust Input (J4)
The Gain Adjust Input allows an analog voltage that is applied between (J4 – Pin A) and
Ground (J4 – Pin V) to control the gain of the amplifier. The gain is adjustable over a 20 dB
range with 0.1 dB resolution. The applied voltage is directly proportional to amplifier gain.
2.5 VDC = Maximum Gain: 75 dB
0.5 VDC = Minimum Gain: 55 dB
The Compact Outdoor SSPA is factory default to have maximum gain with no analog gain
adjust. The gain adjustment must be enabled by running the setup program from a host PC.
This prohibits any accidental gain adjustments that may occur from unintentional analog
voltages that may be present on the Gain Adjust Control J4-Pin A.
The gain is also adjustable using a host PC and the supplied Teledyne Paradise Datacom
Universal Monitor and Control program. See the Serial I/O Section for details on Serial
Control.
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