Wireless IFB (interruptible fold back) systems are used for talent cueing and crew communications in broadcast and motion picture production. In other cases, the IFB system is used by directors and other management to monitor program audio during a production. The IFB PRC-2 receiver provides simplicity and flexibility in a package that is intuitive for untrained users to operate.

The default frequency of the receiver is set by two rotary switches on the side panel. Up to five additional frequencies can also be programmed into the receiver memory using the scan mode.

The design uses +/-20 kHz FM deviation for efficient use of the bandwidth, with compandor noise reduction circuitry for an excellent signal to noise ratio.

The receiver will drive a wide variety of earbuds, headphones and induction neck loops at substantial levels, with loads from 16 Ohms to 600 Ohms.

The receiver is housed in a rugged machined aluminum package. A spring-loaded belt clip provides a secure mounting on a wide variety of belts, pockets and fabrics.

Preset (default) frequency can be set without power or transmitter signal

Frequency agile with 256 frequencies

Scan mode stores up to five additional frequencies

Multi-color LED and rotary control for programming and operation

High sensitivity for extended operating range indoors or outdoors

Rugged machined aluminum housing

Spring-loaded belt clip

Attached battery door

8 hours battery life (alkaline)

20 hours battery life (lithium)

Operating Frequencies: 486.4 to 691.1 MHz

Block 19: 486.4 to 511.9 MHz

Block 20: 512.0 to 537.5 MHz

Block 21: 537.6 to 563.1 MHz

Block 24: 614.4 to 639.9 MHz

Block 25: 640.0 to 665.5 MHz

Block 26: 665.6 to 691.1 MHz

Frequency control: Crystal Controlled PLL Sensitivity: 1 uv (20 dB SINAD)
Signal/Noise ratio: 95 dB A-weighted
Squelch quieting: 90 dB
AM rejection: 50 dB, 10 uV to 100 mV Modulation acceptance: ±20 kHz
Spurious rejection: Greater than 70 dB
Third order intercept: 0 dBm
Frequency response: 100 Hz to 10 kHz, (±1db)
Pilot tone: 29.997 kHz, 4.5 kHz deviation (fixed crystal controlled)
Audio output: 1V RMS into 50 Ohms minimum
Antenna: Headphone cable
Programmable memory: Switches set default frequency; up to five additional frequencies can be stored in memory
Front panel controls: Single knob controls Audio Output Level, Power on, programming and Scan Frequency Selection
Indicators: Multi-color LED indicator for power on and battery status. Blinks to indicate channel number and during scanning.

Power requirement

9V alkaline battery lasts about 8 hours

9V lithium battery lasts about 20 hours

Power consumption: 60 mA Weight: 7.3 oz with battery Size: 3.6 x 2.4 x 0.8 inches (housing only) (belt clip and knob extend beyond the housing)

Power consumption: 60 mA
Weight: 7.3 oz with battery
Size: 3.6 x 2.4 x 0.8 inches (housing only) (belt clip and knob extend beyond the housing)