Справочник Пользователя для Crescend Technologies LLC P2RTK450

Installation

Unit installation shall provide proper air access to the unit; no obstacle for air is allowed closer than 3” from fan.
Unit shall be protected against the direct solar light and precipitation.  The air inlets and outlets should be checked
every 30 days and cleaned if necessary. If the equipment is operated in a severe dust environment, it should be
checked and cleaned more often. If dust and dirt are allowed to accumulate, the cooling efficiency will be
diminished. Using either compressed air or a brush with soft bristles, loosen and remove accumulated dust and
dirt from the air inlet panels.

Check that the fans are running smoothly.  A slow running or noisy fan may indicate an imminent fan failure.  Heat
is one of the biggest factors in reducing the reliability of the amplifier.  Ensure the fan has access to cool and
clean airflow within the rack.

Copper wires # 12 AWG shall be use in DC power line. Wires shall be crimped to ring terminals.
Pre-tinning of crimps is recommended.

Use # 18 or # 20 AWG wire for unit status monitoring circuit. Connect this wire to the pin “ALARM”.

Use # 18 or # 20 AWG wire for forced switching to by-pass mode circuit. Connect this wire to the pin “SH/D”.

Make sure all connections are constructed and implemented properly with best practices.

Make sure that DC power supply voltage and RF source frequency and power are in the

mentioned above limits and that the DC polarity is correct before applying DC power to the amplifier.

Notes: - The reversed DC polarity protection circuit may not operate longer than 0.3 sec;

- Input power shall not exceed 3 W in the working frequency range and shall not exceed

0.3 W out of the specified frequency range of operation.

Operation

Green LED “DC ON” is on and fan is running when DC power supply voltage is applied to the unit, its value
does not exceed 17 V and pin “Sh/D” is not connected to the ground.

       Red LED “LOW OUTPUT” is on if gain is less than 6 dB or input power is less than 0.1 W.

       Red LED “HIGH VSWR” is on when the load VSWR exceeds 2:1.

       Red LED “HIGH TEMP” is on when the heat sink temperature reaches +(85 + 5)ºC.

The voltage at filter “ALARM” is about 0.5 V less than power supply voltage during normal operation and
drops to 0.3V or less when any of mentioned above red LEDs turn on. If a 2 kOhm resistor is connected
between this filter and the ground, a TTL compatible output is created.

When switching the PA to the by-pass mode, the resistance between pin “SH/D” and ground shall be less
than 100 Ohm, or, if a transistor key is used, the voltage drop on the key shall not exceed 0.2 V. The
current, coming out from pin “SH/D” does not exceed 1.7 mA.

5. FCC RF Exposure Requirements

CAUTION: This transmitter must be restricted to work related operations in a Controlled RF exposure
environment. All qualified end-users of this device must have the knowledge to control their exposure
conditions and/or duration, and the exposure conditions and/or duration of their passengers and bystanders,
to comply with the General Population / Uncontrolled MPE limit and requirements.

Vehicle – Antenna Installation Instructions