Telex SPK-300L Portable Desktop Speaker User Station w/ A5F Headset Connector

Telex SPK-300L Portable Desktop Speaker User Station w/ A5F Headset Connector

Telex SPK-300L Portable Desktop Speaker User Station w/ A5F Headset Connector

B&H # TESPK300LDA5 MFR # F.01U.143.104
Telex SPK-300L Portable Desktop Speaker User Station w/ A5F Headset Connector

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Product Highlights

  • 2-Channel Select Portable Speaker
  • Comes w/ Hand-Held Microphone
  • Built-In Speaker
  • Headset Connection
  • Channel Select Switch Feature
  • Call Light
  • Speaker On/Off Switch
  • Dual-Purpose Desktop Volume Control
  • Rugged All Metal Housing
  • Perfect for Table-Top Operation
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  • 1Description

The SPK-300L Portable Desktop Speaker User Station w/ A5F Headset Connector from Telex is two channel select portable speaker user station housed 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.

Each station is a communication unit along a multi-conference bus, and is used in the TW Intercom System.

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.

Operational Controls
Channel select switch / latching-action microphone on-off toggle switch / momentary-action microphone on-off push-button switch / speaker-headphone volume control / call switch-indicator / speaker on-off switch / sidetone adjustment
Volume Control
The volume control also feeds the speaker amplifier via the speaker switch and the speaker dim network
Microphone Preamplifier/Limiter
The microphone preamplifier/limiter converts the small microphone signal to a strong line level signal conditions the signal strength from loud and soft talkers to be almost the same sends the signal to the line via the microphone switch and a bilateral current source
Bilateral Current Source
The bilateral current source adds signal, via the channel select switch, to the line without affecting any signals already on the line. The bilateral current source also extracts the listen signal from the line and sends it to the headphone amplifier via the volume control. Some of the user's own voice signal (sidetone) is also fed to the headphone amplifier
Channel Selector Switch
The channel selector switch selects the channel on which the user will talk and listen. The headphone amplifier output drives the user's headphones
User Station Voltage Regulator
The user station voltage regulator takes power from channel 1, regardless of the channel selector switch setting (exception: local power option units). The regulator not only supplies regulated power to the user station, but also prevents unwanted interaction between the user station and the intercom line which is supplying the power. Because the regulator takes power from channel 1, channel 2 can be expanded into many channels by using a switch and, for each channel, a separate wire and a termination network consisting of a 200 ohm resistor and a 10 microfarad capacitor in series
User Station Voltage Regulator
The user station voltage regulator takes power from channel 1, regardless of the channel selector switch setting (exception: local power option units). The regulator not only supplies regulated power to the user station, but also prevents unwanted interaction between the user station and the intercom line which is supplying the power. Because the regulator takes power from channel 1, channel 2 can be expanded into many channels by using a switch and, for each channel, a separate wire and a termination network consisting of a 200 ohm resistor and a 10 microfarad capacitor in series
In the Box
Telex SPK-300L Portable Desktop Speaker User Station w/ A5F Headset Connector
  • 3-Year Warranty
  • Table of Contents
    • 1Description
    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
    Package Weight 5.45 lb
    Box Dimensions (LxWxH) 13.6 x 11.1 x 7.7"

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