PART IV: PT 81 BODYPACK TRANSMITTER IV
1 Description 
You can use the PT 81 bodypack transmitter with both dynamic microphones and condenser microphones operating on a supply voltage of approx. 7 V.
The PT 81 operates in a subband up to 3 MHz wide of the 710 MHz to 869 MHz UHF carrier frequency range. The PT 81 can be switched to a maximum of 15 dif- ferent carrier frequencies depending on local frequency allocations.
3a | POWER: Switches the transmitter power ON ("I") and OFF ("0"). | 1.1 Controls | |
3b | MIC: Mutes the audio signal (position "0") while power and carrier frequency |
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| remain ON. |
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3c | Status LED: Indicates battery status and audio input overload. |
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| LED glowing dimly: batteries are OK. |
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| LED constantly lighting brightly: batteries will be dead in about 60 minutes. |
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| LED illuminating brightly: audio input is overloaded. |
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3d | Audio Input: |
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| automatically match the connector pinout of the recommended microphones |
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| (see Part IV, section 1.2). |
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3e | Color Code: If you use the transmitter within a multichannel system, you may |
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| remove the black plastic platelet and replace it with a colored platelet includ- |
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| ed in the optional Color Coding Kit to identify each channel by a different |
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| color. |
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3f | CHANNEL: This rotary switch selects the desired carrier frequency. |
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Prior to selecting frequencies, switch the transmitter OFF. | Important: | ||
3g | Belt Clip for fixing the transmitter to your belt. |
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3h | Battery Compartment: Refer to Section 2 Setting Up. |
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3i | Antenna: Permanently connected, flexible antenna. |
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3j | GAIN: This rotary pot allows you to match the microphone or instrument level |
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| to the transmitter’s audio section. |
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3k | Carrier Frequency Table: A label listing the available frequencies is affixed |
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| to the transmitter rear panel. |
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3l | Frequency Set Designation: The label on the rear panel also indicates the |
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| designation of the Frequency Set. |
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3m Security Cover: Protects the POWER and MIC switches from being actuated |
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| unintentionally. |
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| 1.2 Microphones | |
The following AKG microphones have been designed specifically for direct | |||
connection to the audio input of the PT 81: | (optional) | ||
C 417 L |
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C 420 L |
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C 444 L |
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CK 77 L |
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| 2 Setting Up |
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1. Open the battery compartment (3h). | 2.1 Selecting the |
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All controls are now accessible. | Carrier Frequency |
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2.Use the supplied screwdriver (1m) to set the CHANNEL control (3f) to the de- sired channel.
3.Set the CHANNEL control (1k) on the receiver to the same channel as the transmitter.
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