View source for WK20 - 20W Power Amplifier

[[Image:6141 RS.jpg|thumb|500px|WK20- 20 watt amplifier]]

The [[WK20 - 20W Power Amplifier|amplifier 1000614100]] is designed to amplify the audio from an AlphaCom subscriber line. The amplifier can be used standalone (loudspeaker only), or it can be used in combination with a station to amplify the loudspeaker signal. 

==Features==
* Designed to amplify the audio of an ASLT subscriber line
* Can be used standalone (speaker only), or in combination with a station to amplify the speaker signal
* Connects directly to the ASLT subscriber line
* Provides 20 Watt into 4 Ohm or 6 Watt into 20 Ohm
* Powered by 24VAC transformer or 24-36VDC power supply

==Description==
The board contains a power amplifier, a potentiometer for adjusting the output volume and an input for switching the amplifier on/off. The symetrical input is matched to the output level on the [[ASLT]] subscriber board in the AlphaCom exchange.

The amplifier may be constantly on, or switched on and off by the M-key on the calling station. It is recommended that power to the amplifier board is supplied from a separate class II transformer. <br\> In the AlphaCom exchange, brackets must be mounted on the board, in order to fasten to the mounting rail.

The potensiometer "Balance" is to balance out hum and noise, and is preset from factory. Further adjustments are normally not neccessary.

==Connectors and Switches==
[[Image:FIG WK20.PNG|left|600px|thumb|Figure 13-13: ''Connectors and switches on Power Amplifier'']]
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== WK20 and IP Stations ==
The amplifier can also be used with IP stations, connecting the line output of the IP station to the input of amplifier. Note that when used with IP stations the output power will be less than specified in the table below, because the input of the amplifier is designed for ASLT line levels (2.2 volt nominal, max 8 volts) and the line level from the IP stations is 0dBm signal (approx. 0.77 volts).

==Technical Specifications==
{| border="1"
|-
!style="background:#ffdead;" width="200pt"|Text
!style="background:#ffdead;" width="100pt"|Value
|-
|Item Number||align=center|1000614100
|-
|Input signal level||align=center|1 V - 10 V
|-
|Input impedance||align=center|6kOhm
|-
|Output power<br\><br\>||align=center|20 W into 4ohm<br\>12 W into 8 ohm<br\>6 W into 20 ohm
|-
|Frequency range||align=center|140 - 20.000Hz
|-
|Max. amplification||align=center|10.5 dB
|-
|Recommended room temperature<br\>||align=center|0'C to +35'C<br\>+32'F to + 95'F
|-
|Humidity Range<br\>(non-condensing):||align=center|10% - 90% RH<br\>
|-
|Dimensions W x H x D<br\>||align=center|75mm x 84 mm x 40 mm<br\>2.9" x 3.3" x 1.6"
|-
|}

== Related articles ==
* [[IP Substation - Amplified calling]]
* [[WK20 - Applications]]

[[Category:Public Address]]
[[Category:Hardware]]
[[Category:Additional equipment]]