Broadcast Electronics PNP 1000, Manual, Page: 3 / 52

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OPERATING PARAMETERS/FEATURES – FRONT–PANEL CIRCUIT
BOARD.
Some of the operating parameters and features are programmed on the front–panel circuit board . Refer to the fol-
lowing text and Figure 2 to program the transmitter for the desired operating characteristics.
AC POWER ON/OFF BREAKER –
Provides primary ac power control for the transmitter.
MENU UP/DOWN CONTROLS –
Steps through the following readings for the PNP 1000 transmitter. 1) Forward Power. 2) Reflected Power. 3) PA
Voltage. 4) Total PA Current. 5) PA Currents 1–4. 6) PA Heatsink Temperature. 7) Exciter Forward Power. 8)
Exciter Reflected Power. 9) Exciter Current. 10) Exciter Heatsink Temperatures.
POWER RAISE/LOWER CONTROLS –
Adjusts the transmitter RF output power from 250 watts to 1050 watts.
ON SWITCH/INDICATOR –
SWITCH – Enables the transmitter RF output by unmuting the exciter and final power amplifier module.
INDICATOR – Illuminates to indicate the transmitter RF output is enabled.
OFF SWITCH/INDICATOR –
SWITCH – Disables the transmitter RF output by muting the exciter and final power amplifier module.
INDICATOR – Illuminates to indicate the transmitter RF output is disabled.
POWER SUPPLY VOLTAGE INDICATORS –
Illuminates to indicate the +48, +12 AND –12 volt dc from the power supply is operational.
AC LINE FAULT INDICATOR –
The AC line fault indicator illuminates when the AC voltage is outside the operating range required for the pow-
er supply. This range is 95–132 or 190–264 depending on the AC input configuration.
POWER SUPPLY FAULT INDICATOR –
The power supply fault indicator will illluminate when the power supply registers a fault condition. The power
supply fault conditions are as follows. 1) 48V is out of regulation (+8V or –1V). 2) +/–12V supply is out of reg-
ulation (+/–0.5Volts). 3) A surge current from the +48Volt supply occurs. 4) Heatsink temperture on the power
supply exceeds 70C.
EXCITER AMPLIFIER FAULT INDICATOR –
The exciter fault indicator illuminates when one of the following conditions exists. 1) Exciter heatsink tempera-
ture is above 77C. 2) Exciter current is above 4.0 amps. 3) Exciter power falls below 40 watts. 4) Exciter re-
flected power is above 20 watts when the transmitter total power is above 200 watts. 5) Exciter reflected power
is above 25 watts when the transmitter total power is below 200 watts. The transmitter will shut down if any of
the above conditions occur.
POWER AMPLIFIER FAULT INDICATOR –
The PA fault indicator illuminates when one of the following conditions exists. 1) PA heatsink temperature
around any device is above 93C. 2) The bias voltage is maximized but desired output power is not achieved. 3)
Any PA device current is above 11.5 amps. 4) The total PA current is above 42 amps. The transmitter will maxi-
mize power output just below the thresholds defined if any of the above conditions occur.