Neumann.Berlin KTM-910-02-01 User's Manual
Contents
1. 749 14V DC Power 6 mA 9 V 10 mA 12 V A 93 grams Dimensions 24 mm 143 mm long TTA A OS 246 es TEE A EAT gt in 9 T T x 1 102 Reflextions armer Raum Sallfeld 180 2 kHz 4 2 8 kHz 500 Hz 1000 Hz 125 2 2502. is to fit a battery supply unit BS or a supply junction unit SW 1224 at any point along the twin screened microphone cable While the little battery supply unit BS 9 is equipped with a universally obtainable volt battery the supply junction unit SW 1224 is intended to be built into mixing desks or into the terminal boxes containing microphone sockets which are used in many studios The supply junction units SW 1224 are connected to a 12 or 24 V DC mains supply The three pole microphone lines which are equipped with the junction unit SW 1224 can also be used for connecting ordinary microphones which do not require this supply voltage however in that case the DC voltage must be switched off Due to the very low power consumption of the microphone of only 5 mA the microphone cable may have a length of several hundred yards Due to the higher output voltage and the reduced source impedance compared with conventional condenser microphones the signal from this microphone is less susceptible to interference ACCESSORIES Battery Supply BS 9 The battery supply BS 9 is for the supply of one microphone from a commonly used 9 volt battery Power supply N 9 The power supply N 9 45 x 85 x 118 mm provides the necessary supplies for one micro phone from the mains The DC output is stabilised Power supply N 92 This power supply has the same dimensions as the N 9 however two microphones can be fed Even with a short circuit in one su
3. CONDENSER MICROPHONE KTM The condenser microphone KTM has the same characteristics as the NEUMANN miniature microphones KM 64 and U 64 Like with these miniature microphones the directional char acteristics are virtually independent of frequency The am plifier which is built into the microphone uses instead of a valve semi conductors giving particular advantages such as simplified connections reduced power consumption absence of warm up period and valve microphony and a high reliabil ity factor The miniature construction makes the microphone particularly useful for unobtrusive use in film and television studios BASIC CHARACTERISTICS The microphone capsule which is used in the KTM has already proven itself It is a pressure gradient transducer with an a coustical phase shift element and uses a vacuum gold plated diaphragm of temperature stable polyester A main feature of the design is the directional characteristic which is virtually independent of frequency The frequency response curve for angles of incidence of plus or minus 135 decrees are very nearly parallel The attenuation at 135 degrees is 15 dB be tween 100 cps and 16 kcps If therefore the sound source moves in a three quarter circle around the microphone the level will vary but the tone quality will remain constant The cardinal direction of the microphone is in line with the axis of the microphone It should therefore be pointed axially to wards the sound sourc
4. e The microphone amplifier is equipped with a field effect tran sistor followed by a silicon planar transistor in grounded col lector configuration requiring a supply voltage of 7 5 14 V This total range can be covered without switching The audio output level and the equivalent loudness will thus be influenced by less than 1 dB Alimentation can be made by standard 9 V batteries IEC recommendation 6F22 or for studio installations by 12 V DC mains DIN 45 595 As it is not a high frequency circuit but a simple audio frequency amplifier special techniques for avoiding detuning or over EE ae a WA iD DT iT RSP RTS vB EONS SEDAN LE ER DAU SIL 81 314 Feb 66 Printed in Germany KTM 910 02 01 re LEGT WES 28 modulation due to very low frequency interference wind rumble etc can be dispensed with and the circuit is therefore particularly straightforward and reliable The stabilised polarising voltage for the capsule and the supply voltage for the field effect transistor are provided by a built in DC converter of very simple construction Although the microphone contains no transformers the output voltage is balanced The supply voltage is fed through the same pair of wires as the signal This means that only one screened pair is required as microphone cable using a three pole connector the same as for dynamic microphones The only thing that is necessary
5. pply circuit the second microphone will still work correct ly Channel separation Z 110 dB Power supply N 24 The power supply N 24 provides a 24 volts DC By means of supply junction units SW 1224 up to 10 microphones can be fed The power supply N 24 is provided for rack mounting stan dard size 1 Microphone Cables KT 1 and KT 2 The microphone is fitted with a three pole connector type T 3260 1 Connection to the supply units is done by means of extension cable and interconnecting cable KT 2 with swivel stand attachment The cables have a length of 10 meters each TECHNICAL DATA Acoustical Pressure gradient transducer Directional cardioid Frequency response re er ee 40 16 000 cps Output Teve appr 3 mV ub across 1 Electrical load 1000 Q Electrical source 200 Q Capacity of appr 36 pF Weighted noise voltage DIN 45 405 15 pV 28 dB re 2 x 1074 pb Maximum sound pressure for 5 distortion at 40 cps 1 5 200 ub 120 dB for 8 13 V DC 100 pb 114 dB for 7 5 14 V DC Gain of microphone amplifier at 1 4 dB Connectors TETEE PETTEE N T 3260 1 Operating
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