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2.00 PX50 FEATURES
The PX50 is state of the art 50 watt FM stereo transmitter designed for commercial FM,
LPFM and international use over the frequency range of 87.5 MHz to 108.1 MHz. The
RF output level is continuously variable from 1 watt to 50 watts. The transmitter is
housed in a compact 2 rack-unit enclosure for easy installation.
Full front panel control and monitoring is provided by an easy to use navigation switch
matrix with intuitive 2 line 20 character vacuum fluorescent displays. These controls
and displays are provided for the following:
Frequency
Left/Right audio levels
Left/Right peak-hold meters
PLL lock
RF power output
VSWR
Amplifier temperature
Exciter temperature
Audio modulation
Audio modulation limiting (AML)
Stereo mode
Auto VSWR protection
Auto power leveling
Auto temperature protection
Power reduction on error
Power restoration timer
Test timer
Station identity
Control lock
2.01 Continuous Monitoring
The PX50 constantly monitors all of the critical circuits within the transmitter and makes
subtle adjustments to various circuit parameters depending upon frequency, tempera-
ture, power, audio level, and deviation - in short, it's like having a station engineer con-
stantly monitoring and adjusting on-the-fly!
Automatic VSWR protection automatically reduces power output until the VSWR prob-
lem is cleared. Likewise, if the power amplifier temperature exceeds 70° C, the trans-
mitter will reduce power output until it cools down below 60° C. You can set automatic
Power Reduction On Error (VSWR & Temperature errors) to 85%, 75%, 50%, 25% or full
disable of the set power. Full power is restored when the error is cleared. You can also
set the Power Restoration Timer for the error testing time to match your specific site en-
vironment. If the error is cleared within this time, the transmitter is restored to full
power for unattended operation! Your station stays on the air, and needless trips to
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