Specifications

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PX50 50W LPFM Stereo Transmitter
We asked LPFM licensees and users what they really wanted and needed in an FM
stereo transmitter. We listened to a lot of current customers already using our very
popular PX1 transmitter about features they would like. And we even listened to
people using competitive equipment telling us what they really wanted!
What did we hear? You wanted an ultra-reliable transmitter that had automatic pro-
tection circuits that would keep you on the air, rather than shut you down. You
asked for constant diagnostics on all critical circuits and functions. You wanted to
use it anywhere in the world, regardless of input voltage or frequency plan. You
wanted to have automatic battery backup to eliminate costly standby generators.
You asked for more power than 35 watts but wanted it to run extremely cool while
remaining extremely quiet. You wanted full digital display of all functions, parame-
ters, settings and alarms.
And because of the confusion with the FCC equipment requirements you wanted an
FCC CERTIFIED transmitter, not just a verified transmitter. You told us what you
wanted...CONSIDER IT DONE! The PX50 Professional LPFM transmitter, designed
specifically to YOUR specs!
Operation of the PX50 is simple and intuitive via the front panel navigation switch
matrix. All functions, controls, and status are displayed on the 2 line by 20 character
vacuum fluorescent display. Simple navigational controls and displays are provided
for:
Installation of the PX50 is a breeze. A standard Type-N connection is provided for RF
Output. Balanced (XLR) left and right audio inputs are provided to properly interface
with any audio source you have. In addition, BNC SCA/Digital/RDS inputs are pro-
vided along with a quick disconnect connector for a 12 VDC standby/back-up power
input. In short, connect your audio sources and antenna, power it up, set frequency
and power level via the front panel navigation switch matrix, and you’re on the air! It
doesn’t get any simpler!
✔✔
50W RF Output, Continuous Duty
✔✔
FCC Certified, Parts 2, 73, 74
✔✔
Automatic Monitoring
✔✔
Automatic VSWR Protection
✔✔
Automatic Temperature Protection
✔✔
Digital Display of All Parameters
PX50 Professional 50 Watt LPFM Broadcast Stereo Transmitter $1995.00
General Display
(Default)
Audio
Levels
Antenna System
VSWR
Internal
Temperature
Audio
Levels
VCO Deviation
Levels
RF
Frequency
RF Output
Power
Stereo/Mono
Mode
Station
ID
Option
Display
Controls
Locked/Unlocked
STAY ON-THE-AIR WITH THE PX50!
SPECIFICATIONS
Frequency Range: 87.5 to 108.1 MHz
Primary Power Input: 85-264 VAC, 47-63 Hz; 120-370 VDC
Backup Power Input: 12-14 VDC
Broadcast Modes: Stereo/Mono + SCA and Digital RDS Inputs.
Bandwidth: ±75 kHz when properly adjusted, auto adjust feature prevents overmodulation.
Separation: Better than 50 dB (typical 60–70 dB)
Crosstalk: Better than 50 dB.
Asynchronous: Better than 60 dB.
THD: Better than 0.3% with processing.
Audio Inputs: Standard Balanced Inputs +4 dBu/1.228V rms/3.47 V p-p; -10 to +10 dBm range.
Audio Input Impedance: 22K Ohms
SCA and Digital Inputs: BNC (50 Ohms)
RF Output: 50W Continuous into a 50 ohm load. Fully adjustable from 1 watt to full power.
Harmonic Suppression: Better than -81 dBc
Display: 2 lines x 20 characters vacuum fluorescent display.
Controls: 5 navigation controls (Up, Down, Left, Right, Enter)
Cooling: High CFM Fan, dual filtered front intake, rear exhaust.
Over-Power Protection: Continuously checks for proper power output to within 5%.
VSWR Protection: Continuous VSWR monitoring, controlled via Power Reduction On Error and Power Restoration Timer settings.
Over-Temperature Protection: Auto over-temperature control, 70°C max. fixed, controlled via Power Reduction On Error and Power Restoration Timer settings.
Auto Power Reduction On Error: Automatically reduces power output to 85%, 75%, 50%, 25% or full disable of set power level.
Auto Power Restoration Timer: Sets the time interval for automatic error checking to clear reduced power modes and to restore full set power level.
Overmodulation Protection: Auto control of audio modulation levels, on/off.
Audio Frequency Range: 20 Hz to 16 kHz ±1 dB. Steep “brick wall” 16 kHz low phase shift, low pass filter, down 68 dB @ 19 kHz and above.
Adjustments: Audio input levels, Modulation Level, Power Level, Frequency (in 100 kHz steps), Stereo/Mono mode, Auto Adjust Modulation mode (On/Off)
Regulatory Approval: Meets or exceeds FCC 47CFR Parts 15.107(b), 15.109(b); FCC CERTIFIED FCC 47CFR Parts 2, 73, and 74 (ID: PF3PX50)
Dimensions: Standard 2-unit rack-mount case, 19" wide, 14.25" deep, 3.5" high.
(Note: The end user is responsible for complying with all FCC rules & regulations within the US, or any regulations of their respective governing body)