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This item is noncancelable and nonreturnable.
You Pay: $1,041.95
The SPK-300L Portable Desktop Speaker User Station w/ A5F Headset Connector from Telex is a portable speaker station used in the TW Intercom System. Each station is a communication unit along a multi-conference bus. The SPK300L includes the following functional components: a microphone preamplifier with limiter, an electronic microphone switch, a bilateral current source line driver, a listen volume control, a headphone amplifier, a speaker amplifier, a speaker switch and a channel selector switch.
The SPK 300L is designed in a rugged all metal housing perfect for table-top operation. Some features include channel select switch, call light, speaker on/off switch and dual-purpose portable desktop volume control.
Voltage | Audio line voltage: 1 volt, peak (0 dBm voltage-equivalent) |
Range |
Average speech level range: -20 dBV to -10 dBV Absolute maximum speech level: 3 volts, peak (linear limit) |
Impedance | Audio line impedance, nominal: 50 ohms, 75Hz-20kHz system will continue to operate from 50-300 ohms |
DC Current Requirements |
Nominal: 32 V DC Operational range: 18-35 V DC Steady state without damage: -1.5-36 V DC Transient: 200 V, 8ms or less (after this time, power supply and user station fuses will open) Quiescent (per station): 10-40 milliamps Dynamic (per station): 50 milliamps (w/ 25 ohm headphones); 70 milliamps (w/ 25 ohm headphones and lights); 100 milliamps (w/ 8 ohm speaker) Start-up current: 1.25 amperes, 50 units, all kinds Fault current: 4.0 amperes, power supply at voltage >12 volts 1.0 amperes, power supply at voltage <12 volts |
Operating Distance |
Maximum DC limit: 5000' (1524 m) distance along cable, power supply to single station #22 gauge wire - DC voltage drop limitation Maximum AC limit: 10,000' dry pair, power supply at each end, #22 gauge wire System capacitance: 0.3 microfarads (cumulative effect of 10,000' (3048 m) of maximum cable at 30 picrofarads/foot) |
Inputs/Outputs |
Dynamic microphone type headset or handset Carbon microphone type headset or handset Line input (ties the station to the intercom line) Loop/extension (allows another station to access the line through the first station. Also called loop-through |
DC Voltage |
User station specifications: 20-35 V DC, operating from -200-36 volts DC without damage |
DC Current Requirements |
User station specifications: DC current: Quiescent, 10-40 milliamps 50 milliamps, typical (w/ 25 ohms headphones) 75 milliamps, typical (w/ 25 ohms headphones + lights) 100 milliamps, typical (w/8 ohm speaker) |
Impedance |
User station specifications: 10,000 ohms typical; 2000 ohms worst case dynamic operation |
Temperature |
User station specifications: Operating: 0-140°F (0-60°C) Storage: -67-257°F (-55-125°C) |
Noise |
User station specifications: One unit: -75 dBu Ten unit: -67 dBu |
Panel Microphone Preamp |
Input impedance: 470 ohms Source impedance: 200 ohms, nominal Maximum input level: 150 millivolts Voltage gain: 54 dB Frequency response: 100-10,000Hz, 3 dB Limiter range: 50 dB Carbon mic excitation current: 10 milliamps, nominal |
Current |
Transfer ratio: 5 milliamps / 1.5 V Output: 5 milliamps into 200 ohms |
Headphone Amp |
Overall voltage gain: 24 dB Overall voltage gain: 9 V peak-to-peak into 25 ohms Output power headset station: 1/2W into 25 ohms Speaker station: 2W into 8 ohms Frequency response: 150-8000Hz, 3 dB Headphone impedance range: 25-600 ohms Sidetone adjustment range: 20 dB to full on |
Call Light Levels |
Signaling frequency: 20,000kHz 3dB Flashing rate: 3Hz, 2Hz |
Color | Grey |
Dimensions (H x W x D) | 4 x 8 x 8" (101.6 x 203.2 x 203.2mm) |
Weight | 3.5 lb. (1.6kg) |
Packaging Info | |
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Package Weight | 5.5 lb |
Box Dimensions (LxWxH) | 13.6 x 11.1 x 7.9" |