RCA Audio Broadcast Equipment
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CONSOLES PHONO TAPE MICROPHONES Broadcast AUDIO Equipment www.americanradiohistory.com About This Catalog ncn This is one of several catalogs published by RCA Broadcast Systems Department. It describes RCA products that serve the audio portions of the broadcast plant. For radio broadcasting, RCA publishes a companion catalog that describes AM and FM transmitters, accessories, remote control equipment, monitors, transmission line, towers and antennas. For TV broadcasting, companion catalogs describe camera equipment, terminal and switching gear, UHF- and VHF -TV transmitters, transmission line, towers and antennas. These catalogs are available at RCA regional offices. Each office is staffed by a sales representative with broad experience in the broadcast business. He can help you plan your equipment facilities and supply the information you need. Contents Microphones AM /FM /FM- Stereo Tuner, Type ST -6 B.1482 General Information B.1001 Public Address Amplifiers, SA- Series B.1490 Dynamic Microphones, BK- Series B.1010 Audio Equipment Power Supplies, BX- Series B.1495 Microphones, SK- Series B.1015 Racks, Cabinets, Furniture, Rack Equipment High Quality Ribbon Microphones B.1020 Cabinets, Racks, Panels B.1501 Microphone Stands and Accessories B.1040 Studio Furniture B 1504 Consoles Audio Relay Switcher Module B 1530 Audio Consoles, Types BC -7, -8, -17, -19, BCM -2 B.1160 Audio Accessories B 1540 Audio Consoles, Types BC -14, -15, -18 B.1170 Turntable Equipment Remote Amplifiers, Types BN -1 and BN -4 B.1180 Phono Equipment B.1600 Five -Input Mixer Preamplifier Type SN -10 B.1185 Four -Mixer Remote Console, Type PAM -1 B.1186 Tape Equipment Remote Consoles, Type BN -7, BN -17 B 1190 Program Logger, Type RT -19 B.1701 Custom -Built Audio Consoles, Type BC -100 B 1210 Reel -to -Reel Tape Recorder, Type RT -21 B.1705 Automatic Reel -to -Reel Machine, Type RT -22 B 1707 Audio Automation Reel -to -Reel Tape Reproducer, Type RT -20 B 1710 Automatic Programming B 1250 Multicartridge Playback Systems, RT -16; RT -26 B.1736 Cartridge Tape Carousel, Type RT -25 B.1738 Intercom /Interphone Equipment Cartridge Tape System, Type RT -27 B 1741 Expandable Intercom System 8.1300 Tape Recorder Accessories B 1763 Headphones and Headsets B.1310 Interphone Equipment B.1320 Loudspeakers and Accessories Loudspeakers and Enclosures B.1800 Amplifiers and Signal Processors Transformers, Wire and Cable B.1860 Modular Audio Amplifiers, Type BA -40 Series 8.1450 Console Audio Amplifiers, Type BA -70 Series B.1460 Test Equipment Monitoring System, Type BA -8 B.1481 Audio Level Meter, Type BI -100 B.1900 www.americanradiohistory.com 1 IIIN www.americanradiohistory.com catalog B.1001 RC/1 Microphones, Microphones, General Information The wide range of RCA microphones General Information velocity, ribbon, pressure and dynamic -offers users a choice of quality and economy; performance and price. There is considerable overlap in the applications of the various types, but each possesses certain attributes which make it particularly suited to specific applications. The chart below provides a convenient reference for selecting the RCA microphones which best match the intended usage. Chart Showing Microphone Applications, Chief Charterisitics and Recommended Mounts Effective Output Frequency Max. Hum Directional Output Impedance Response Pick -up Finish Stand Type No. Used Characteristic Level Ohms Hz Levels and G114 dBm 30/150 Satin Chrome Boom, Desk, Program, Poly- directional -53 30- 20,000 -128 dBm 77 -DX Announce Get -147 dB 250 6 TV Gray Floor dBm 30/150 Satin Chrome Boom, Desk, Program, Semi- and -52 BK -1 dB 50- 15,000 -102 dBm & TV Gray Floor Announce Nen- directional Gas -146 250 Program, -57 dBm 30/150 Boom, Desk, BK -5 Improved 30- 20,000 -128 dBm TV Gray Announce Cardioid Get -151 dB 250 y Floor dBm 30/150 BK -6 "Off- Mike" -65 Microphone Semi -directional 60- 15,000 -112 dBm TV Gray Speech Get -159 dB 250 Lanyard, Clip Program, -56 dBm 30/150 Stainless Steel & BK -11 20- 20,000 -130 dBm Desk, Floor Announce Bi- directional G1 -150 dB 250 TV Gray Program, -60 dBm Bronze epoxy Lanyard, BK -12 30/250 60- 18,000 -120 dBm Announce Non- directional G1 -154 dB & matte gold Clip, Hand Finish Floor Program, -60 dBm 30'50 20- Satin BK -14 Omnidirectional 20,000 -120 dBm Announce -154 dB 150/ 250 Nickel Hand, Desk, Floor Program, -60 dBm 30 /50 20- 20,000 dBm Satin Finish BK -16 Omnidirectional -120 Hand, Desk, Announce -154 dB 150/250 Nickel Public Address -55 dBm Desk, Floor SK -30 Omni- directional 30/250 50- 14,000 -115 dBm Midnight Blue Pa 9 in 9 Gm -149 dB -54 dBm Two -Tone Public Address Semi -directional 250 70- 10,000 -105 dBm Desk, Floor SK -39 Get 148 dB Gra Pan9 9 y Radio & TV dBm -115 dBm Satin Chrome SK -46 Bi- directional -58 200/15,000 40- 15,000 Desk, Floor Announce GM -150 dB -98 dB below & TV Gray 1 volt ,i I Reference level 0.001 watt, sound pressure 10 dynes per square centi- For details refer to description of each particular type. meter. This corresponds to a raking by the ER system at o sound 4 Gm = (EIA rating). pressure level of 94 dB. 2 Level referred to a hum field of 10 -3 gauss. Switched low-frequency rolloff -8 and -16 dB m 50 Hz. www.americanradiohistory.com High Quality Microphones M ic. Output Level Change not be expressed in dBm because the Impedance Microphones such as the Types BK -1, dB microphone delivers no appreciable pow- BK -5, BK -6, BK -11, BK -12, BK -14, BK- I 250 0 +2.2 er. The logical approach is to arrive at 16 and 77DX, all have certain common some level figure which, when combined 150 -2.2 0 performance criteria which make them with the conventionally measured ampli- especially suited. They offer smooth fre- Amp. Input fier gain, gives the correct output level Designation quency- response characteristics, low -dis- 250 150 for the combination. This figure is listed tortion, high output level, well- shielded in the catalog for each microphone and In addition, there is some change in the output transformers (to prevent hum pick- is called the Effective Output overall response- frequency characteristic Level. up) and where necessary, shock mounting It differs from the EIA standard rating of the system below 100 Hz and above to reduce low -frequency "rumble." (Gm) in the value of sound pressure 5000 Hz, the magnitude depending on the and source impedance. The EIA rat- connection and the design of both the Public Address Microphones ing computation is based on microphone and the amplifier input trans- a source Public Address microphones such as the impedance of 150 ohms for all micro- former. Variations in response with qual- SK -30, SK -39 and SK -46 are designed phones having output impedances between ity microphone amplifiers, in most cases, as economy microphones. In general, 75 and 300 ohms, and on a sound pressure is less than +1 dB. frequency range and sensitivity are sac- of 0.0002 dynes per square centimeter. rificed to some extent gain With microphones connected to a re- to ruggedness The Effective Output Level calculation and lower cost. sistance load, these changes in level result when the output is referred to a matched is based on the nominal microphone im- Unloaded Transformer Input condition: pedance and on a sound pressure of 10 dynes /cm2. RCA Microphones work into a micro- Mic. Output Level Change phone preamplifier equipped with an un- Impedance dB The EIA standard defines the system loaded input transformer. rating (Gat) of a microphone as the ratio Under this con- 1 250 0 -2.5 dition, the voltage appearing at the input in decibels relative to 0.001 watt per 150 +2.0 0 of the first amplifier stage results in a 3- 0.0002 dynes per square centimeter of the to 6-dB gain in signal -to -noise ratio as Load maximum electric power available from compared with a matched -resistance load. Impedance 250 150 the microphone to the square of the un- disturbed sound field pressure in a plane Microphone Resistance progressive wave at the microphone posi- Loading Microphones Shipped Less Plug Microphones in which the moving sys- tion. Expressed mathematically: RCA microphones are supplied less the tem is highly damped, in general, have plug for connection to the wall outlet or Gs, (20 log 10 loge Rre) 50 dB. their frequency response characteristics - P - . amplifier system. This is done to allow little changed by electrical loading. The where E = open circuit voltage (mic.) the user to select any desired plug. As a BK-1 and BK -6 are examples P = the undisturbed sound field of this. convenience, popular types of plugs are pressure Microphones which show output im- cataloged and they may be ordered as an RMR - mie. rated impedance pedance variations with respect to fre- accessory if desired.* Electrical reference level = .001 watt quency will have their response charac- Sound pressure = .0002 dynes /sq. cm. teristics adversely affected by resistance Microphone Mounting While this may look complex, the ap- loading. The Type BK-5 and 77 -DX (in RCA has standardized on the 3a "-27 plication is simple. For all practical pur- the bi- directional and uni- directional po- and half-inch pipe- thread for microphone poses the output level of the microphone sitions) are typical examples. Resistance mounting. This makes it easy to add is obtained by adding to Gat, the sound loading of these microphones will gen- microphone stand extensions, booms, etc., pressure level relative to 0.0002 dynes per erally result in a reduction in low frequen- made up from standard half -inch pipe and square centimeter.