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PJ300M
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User Manual
Rev. 7.0 - 25/07/03
4. General Description
RVR Elettronica’s PJ300M is a 19” rack-mountable, 3 HE high, solid-state broadband
power amplifier for FM audio broadcasting. It works without adjustment on the whole
87.5 - 108 MHz FM band and its power output is 300 W nominal with a drive level of
about 10W.
The RF power section employs one high power MOSFET module, able to deliver
more than 300 W.
The power supply is a switching mode one, and a “soft-start” circuit is included to
minimize the transformer’s current spikes when the device is switched on.
The amplifier features a built-in protection system against situations than can be
dangerous for the device like exceeding output power or reflected power, overdrive
or overtemperature. The protection system is conceived to return the machine in its
normal status if the conditions that generated the warnings were temporary.
The front panel includes an analog display to measure the main working parameters.
The different parameters are selected with a rotating selector.
A series of LEDs on the front panel give to the user immediate signalling of conditions
that have to be noticed. The group includes four red alarm LEDs (temperature, external
SWR, internal SWR, overdrive), a green LED that indicates the ON status of the
amplifier and a yellow LED that indicates if the machine is forced to stand-by status
by an external signal through the telemetry connector.
On the telemetry connector the main parameters are availabe for the user as dc
voltage levels that are proportional to the value of the parameter under consideration.
A built-in low pass filter keeps the harmonic emission level below the CCIR and FCC
permitted thresholds.
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