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 IFBR1a-VHF 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. If more than one frequency is stored in the receiver, the operator can scroll through all stored frequencies by simply pressing the volume knob.
Preset (default) frequency is manually set with hex switches
Scan mode stores up to five additional frequencies in memory
Multi-color LED and rotary control for programming and operation
High sensitivity for extended operating range indoors or outdoors
Rugged machined aluminum housing
Attached battery door
8 hours battery life (alkaline)
20 hours battery life (lithium)
Protective leather pouch is included
Operating Frequencies (MHz): 174.100 to 215.750 MHz
Available Frequencies: 239
Channel Spacing: 175 kHz
Frequency control: Crystal Controlled Phase Locked Loop
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, headphone: 1 Vrms into 50 ohms minimum
Antenna: Headphone cable
Programmable memory: 5 frequencies
Front panel controls: Single knob controls Audio Output Level, Power on, programming and Scan Frequency Selection
Indicators: 1 tricolor LED Indicator for power on, blinks to indicate channel number, blinks fast during scan, and turns yellow or red for low battery.
Power requirement: Single 9V Alkaline Battery for approximately 8 hours operation.
Power consumption: 60 ma.
Allen wrench for knob: 0.035" (Lectro part number: 35854)