38 Applications for Communications and Technology
10 Items Per Page
Distributed dc Power From Current-Limited Switching Power Supply
AN-2193
Description
The low current consumption of STICK‑ON modules allows multiple modules to be powered from a single supply. The ST‑PD5U distributes power from any RDL current‑limited switching power supply to up to five modules with a total current requirement of 2 amperes or less. RDL 24 Vdc switching power supplies (purchased separately) are available with current ratings of 500 mA, 1 A and 2 A. All meet ENERGY STAR Level V standards.
Multi-Channel Level Control for Theater or Control Room
AN-2160
Description
The RU‑VCA6A (6 channel) and RU‑VCA2A (2 channel) Digitally Controlled Attenuators are arranged in a MASTER/SLAVE configuration to allow single point level control of the 7.1 surround sound source feeding the amplifiers. Either VCA module may serve as master. This application uses an RLC10K Remote Level Control to control the RU‑VCA6A. The RU‑VCA6A control output port is connected to the control input of the RU‑VCA2A, which is set to slave mode. The RU‑VCA2A follows the level setting of the RU‑VCA6A. Multiple VCA modules may be slaved from a single master module. The RU‑VCA6A and RU‑VCA2A offer clickless level adjustment, accurate tracking and outstanding wide‑band, low‑noise studio quality performance. They can be operated remotely by a variety of RDL single or multi‑point controls, third party controllers and/or locally via front‑panel pushbuttons. Each audio input and output may be wired balanced or unbalanced. The RU‑VCA6A and the RU‑VCA2A may be used independently in 5.1 surround and stereo systems.
Multi-Zone Paging w/BGM and Message Repeater
AN-2144
Description
An RDL FP‑MR2 Message Repeater plays back pre‑recorded messages and provides ducking or muting of the BGM source during message playback. The message repeater can be programmed to repeat automatically or may be triggered manually. Two dynamic or condenser microphones are pre‑amplified to line‑level by an RDL HR‑MP2 Dual Microphone Preamplifier. All three audio sources (BGM/Message Repeater, Paging Mic 1, Paging Mic 2) are distributed to each of the three floors of an office or retail building over readily available CAT5 cabling utilizing an RDL RU‑TPS4A Active Sender/Distributor and three TX‑TPR3A Active Receivers (one per floor). Each Active Receiver provides line‑level audio to an RDL HD‑MA35A Mixer Amplifier. The BGM/Message Repeater signal connects to Input 2 of the mixer amplifier on each floor. Input 1 of each mixer amplifier is fed from the Receiver output that corresponds with the Paging Mic (1 or 2) that will be used to page on that floor. Input 1 is set to "duck" the other amplifier input(s) so paging will take priority.
The RDL Format‑A twisted pair products provide flexibility and expandability for this multi‑zone paging system. Additional floors may be added using additional receiving modules and amplifiers./
1x4 VGA through QXGA Distribution
AN-2079
Description
Waiting rooms, airport terminals, dispatch centers, and operations hubs are just a few of the locations where multiple monitors of computer generated video are needed. The EZ‑VMD4 provides one local monitor plus three monitor outputs. Outputs offer wide RGB bandwidth for superb graphics reproduction and high resolution compatibility from VGA through QXGA. Front panel switches allow ID BIT selection and selection of TTL or Video 75 Ω sync. The compact size of the EZ‑VMD4 allows the use of this professional quality distribution amplifier even when equipment space is limited.
The EZ‑VMD4 is shipped with a high‑efficiency power supply that connects to a locking dc power jack.
Four Channel Microphone Mixing on Portable Cart
AN-2054
Description
This system uses an RU‑MX4 four‑channel studio‑quality mic/line mixer for rental staging applications. A cart is used for moving the mixer, microphones, and other AV gear to the location where they are required. The mixer output feeds a high quality XLR wall plate that is directly wired into the house audio system. The mixer provides user‑adjustable input gain for level matching as well as an output trim and level meter for total adjustability in a compact package. The RU‑MX4 provides phantom power for condenser microphones and has a switchable soft‑knee compressor to avoid transient overloads.
Remote ON/OFF Control Allows Users to Turn Systems On and Off
AN-2172
Description
The four separate sound systems are comprised of modules in the Equipment Rack powered by a single 24 Vdc power supply. Good engineering practice requires that the power wiring to each component originate at the power supply output. In this installation, the TX‑PD8X Switching Power Supply Distributor serves as the power source for the eight modules comprising the four systems. The TX‑PD8X is equipped with remote control terminals that provide for turning its eight outputs on or off. The wall‑mounted D‑RT2 Remote Control Selector allows users to control the TX‑PD8X, thereby turning the four systems on or off. Visual indication of the ON/OFF status is provided on the remote control. The TX‑PD8X is capable of distributing up to 2 Amps of 24 Vdc power to a maximum of eight dc power jacks from the corresponding RDL current‑limited switching power supply. A smaller RDL power supply may be used for systems with less total module current.
Briefing Room Mics and Near-Field Monitors
AN-2247
Description
All audio processing in this briefing room is handled by a centrally located Dante‑enabled DSP. The RDL DD‑BN2M Bi‑Directional Mic/Line Interface connects the two microphones and the two permanently installed D‑PSP1 Decora‑Style Active Loudspeakers to the Dante network. Each D‑PSP1 serves as a near‑field monitor and is fed from the line‑level outputs on the rear of the DD‑BN2M. Each XLR input provides three switches that are set from the front of the unit before the cover plate is installed. One switch enables or disables P48 phantom; the second switch selects the mic or line gain range; the third switch sets the gain.
2-Zone Paging System for Office Space
AN-2063
Description
This example shows how to utilize telephone line (input) ports on an existing KSU to add two zones of paging from the telephone system. The ST‑TC1 acts as a virtual phone line when interfaced with a KSU FX port. When either “line†is selected using any phone instrument connected to the KSU, the associated ST‑TC1 provides an audio path from the instrument mouthpiece to the paging amplifier. In this example two FP‑PA20A 70 volt amplifiers are powering 70 Volt loudspeakers in the two office areas. The ST‑TC1 provides relay contact closures when it is activated by a telephone instrument. The relay contacts can be used to provide additional functions when paging is active, including visual indicators or triggering a radio transmitter.
Four Channel Audio Distribution for Individual Audio Monitoring via Headphones
AN-2053
Description
This example shows a four channel audio distribution system. The system uses a compact, studio quality, stereo audio distribution amplifier to feed four separate headphone amplifiers. The headphone amplifiers have individual volume controls for easy user adjustablility. The output amplifiers deliver more than 50 mW into either high or low impedance headphones through a durable, metal ¼" (6.3 mm) headphone jack.
Amplified Audio for Indoor or Outdoor Information Booth
AN-2112
Description
An RDL TX‑J2 Unbalanced Input Transformer provides a balanced mono audio source from the computer in this information kiosk. The FP‑PA18H 18 Watt Mono High Temperature Audio Amplifier provides ample power to drive the 8 Ohm speaker. Its integral compressor/limiter provides consistent levels for enhanced intelligibility without clipping. The ST‑PA18H is rated for operation between 0 and 70 degrees C (158 degrees F) so that it can operate comfortably when used in a space that is not temperature controlled.