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User Manual for Telex SPK-300L Portable Desktop Speaker User Station w A4F Headset Connector Click to enlarge the picture
Contents of the user manual for the Telex SPK-300L Portable Desktop Speaker User
- Product category: Wired Intercoms Telex
- Brand: Telex
- Description and content of package
- Technical information and basic settings
- Frequently asked questions – FAQ
- Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
- Authorized service for Telex Wired Intercoms
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User manual for the Telex SPK-300L Portable Desktop Speaker User contain basic instructions
that need to be followed during installation and operation.
Before starting your appliance, the user manual should be read through carefully.
Follow all the safety instructions and warnings, and be guided by the given recommendations.
User manual is an integral part of any Telex product,
and if it is sold or transferred, they should be handed over jointly with the product.
Following the instructions for use is an essential prerequisite for protecting
health and property during use, as well as recognition of liability on the part of the manufacturer
for possible defects should you make a warranty claim. Download an official Telex user manual in which you will find instructions on how to install, use, maintain and service your product.
And do not forget – unsuitable use of a Telex product will considerably shorten its lifespan!
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Product description The SPK-300L Portable Desktop Speaker User Station w/ A4F 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. - 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
- Volume Control
- The volume control also feeds the speaker amplifier via the speaker switch and the speaker dim network
- 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
- 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
UPC: 800549425162 In the Box Telex SPK-300L Portable Desktop Speaker User Station w/ A4F Headset Connector 3-Year Warranty Table of Contents
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Technical parametersTelex SPK300L A4F Specs | 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) | | | | Package Weight | 5.4 lb | | Box Dimensions (LxWxH) | 13.8 x 11.0 x 5.5" |
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