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Clear-Com PTX3-21 UHF IFB Transmitter With DSP and LCD Interface

Clear-Com PTX3-21 UHF IFB Transmitter With DSP and LCD Interface

SoundPro Item: 75715 | Part Number: PTX3-21

Pricing available upon request

Pricing available upon request

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  • DSP Processing With LCD Readout For Real-Time Transmitter Monitoring
  • Selectable Low-Frequency Rolloff Reduces Noise In IFB Program Feeds
  • Multi-Mode Compatibility Integrates Into Mixed-Brand Wireless Systems
  • Locked Menu Setting Prevents Accidental Changes During Live Operation
  • Balanced And Unbalanced Audio Inputs Cover Line, Mic, RTS, And Clear-Com Sources
  • Machined Aluminum Housing Provides Durability In Touring And Install Environments
  • Standalone Or Rack-Mountable For Flexible Deployment Options
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The Clear-Com PTX3-21 is a UHF IFB transmitter built for broadcast engineers, live production crews, and intercom system integrators who need reliable wireless program feed delivery with precision control. Operating in Block 21 (537.6 to 563.1 MHz), it targets applications where frequency coordination in a congested RF environment demands flexibility and stability. DSP processing and an onboard LCD give operators real-time visibility into modulation, frequency, mode, rolloff, and audio level without guesswork at the rack.

Where the PTX3-21 separates itself from basic IFB transmitters is in its compatibility depth. It supports IFB, Digital Hybrid Wireless, 200 Mode, 400 Mode, 100 Mode, Mode 3, and Mode 6, allowing it to integrate into mixed-brand wireless ecosystems that are common in broadcast facilities and touring production environments. Audio input configuration is rear-panel selectable for Line, Mic, RTS 1, RTS 2, and Clear-Com standards, accepting both balanced and unbalanced sources. The lockable menu setting prevents accidental parameter changes during live operation, a critical safeguard in high-stakes broadcast or theatrical intercom deployments. The unit operates standalone or mounts in a standard rack using the optional PRK-2 kit, making it adaptable to both mobile cart setups and permanent install bays.

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Specifications

RF Performance
Operating Frequencies (Block 21)
537.6 to 563.1 MHz
Full Tuning Range
486.4 to 639.9 MHz
Channel Spacing
100 kHz (0.1 MHz)
Frequency Stability
+/-.001% (10 ppm) at 25°C
Temperature Stability
+/-.001% (10 ppm) from -30°C to +50°C
RF Power Output
250 mW (nominal)
Output Impedance
50 Ohms
Spurious and Harmonic Suppression
37 dBc above 1 GHz
Modulation
FM; +/-20 kHz deviation IFB and 100 Mode; +/-75 kHz 200 and 400 Mode; +/-50 kHz Mode 3 and Mode 6
Audio
Frequency Response (IFB Mode)
100 Hz to 8 kHz, +/-1 dB
Frequency Response (200 and 400 Mode)
30 Hz to 20 kHz, +/-1 dB
Signal to Noise Ratio
90 dB typical (A-weighted)
Low-Frequency Rolloff
Menu selectable, 3 dB down at 35 Hz or 50 Hz
Audio Input Levels
0 dBu Line/RTS1/RTS2; -10 dBu Clear-Com; -42 dBu mic dry; +/-50VDC max
Audio Input Impedance
Greater than 2K balanced; greater than 1K unbalanced
Control Range
−18 dB to +24 dB (0 dB nominal center), software selectable
Audio Input Jack
Standard XLR female connector
Audio Input Config
Balanced and unbalanced; rear panel selectable for Line, Mic, RTS 1, RTS 2, Clear-Com
Compatibility
Compatibility Modes
IFB, Digital Hybrid Wireless, 400 Mode, 200 Mode, 100 Mode, Mode 3, Mode 6
Pilot Tone
29.997 kHz IFB Mode; 32.765 kHz 200 Mode/400 Mode; 32.768 kHz Mode 6
Channel Selection
Momentary pushbutton switches, Tune Up and Down
Controls
Front Panel Controls
MENU momentary pushbutton; Power OFF-TUNE-XMIT 3-position slide switch; Select Up and Select Down momentary pushbutton switches
Rear Panel Controls
Input Mode Select, 4-section DIP switch
Indicators
Backlit LCD displaying modulation meter, frequencies, modes, rolloff, audio level, and tuning groups
Power
Input Power
12 to 14 VDC typical, 200 mA max; input range 6 to 18 VDC
Power Input Jack
Coax type, locking LZR RL26AE
Dimensions
Dimensions (L x W x H)
5.25" x 3.25" x 1.25" (including connectors)
Identifiers
Emission Designator
180KF3E
FCC Acceptance
Part 74: 470-608 MHz and 944.1-951.9 MHz

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