Shure 520D Data Sheet

222 HARTREY AVE.. EVANSTON, IL. 60204 U.S.A.

MICROPHONES

AREA CODE 312/866-2200 . CABLE: SHUREMICRO

TWX: 910- 231-0048 TELEX: 72-4381

The Model 520D dual-impedance, CONTROLLED MAGNETICB, Green Bullet Microphone is especially popular for harmonica pickup. The microphone can be cupped in the hands, used with a Quick Disconnect Adapter (Shure Model

A47) on a stand, or boom- or gooseneck-mounted, to suit the

needs of each individual performer. It has a sturdy all-metal

case and a reliable two-conductor shielded cable. The 520D can be connected as is to high- or unbalanced dance microphone inputs; or it can be connected to balanced low-impedance inputs after a simple internal modification.

SPECIFICATIONS

Type

CONTROLLED MAGNETIC

Frequency Response

100 to 5,000 Hz (see Figure 1)

+I0

AND

ELECTRONIC

low-impe-

COMPONENTS

-10

I00

TYPICAL FREQUENCY RESPONSE

Polar Pattern

Omnidirectional

lmpedance

Dual. Microphone rating impedance is 150 ohms (160

ohms actual) and "High".

Load lmpedance Range

Low lmpedance. High lmpedance

Output Level

Open Circuit Voltage* Power Level**.

'0 dB = 1 volt per microbar

**0 dB = 1 milliwatt per 10 microbars

Cable

6.1 m (20 ft) two conductor shielded, attached

Case

Green and chrome die casting

Dimensions

62.7 mm (2% in.) diameter, 82.6 mm

Net

Weight

6309 (22 02)

(at 1,000 Hz)

. . .

(with cable)

FREQLENCV

FIGURE

. . . . . . . .

. . . . . .

. . . .

. . .

lpO0 10,000

HERTZ

Minimum Recommended

. .

.I50 ohms .I5 kilohms

. . . .

-73.0

(0.22

. . . . . .

-51.0 dB

2opoO

1,000 ohms 100 kilohms

lmpedance

Low High

mV) (1.6 mV)

(3%

-56.0 dB

in.) long

MODEL 520D

CONTROLLED MAGNETICB

:!gT

CONNECTIONS

For unbalanced microphone inputs, the WHITE lead of the 520D is the low-impedance audio output; the BLACK lead is the high-impedance audio output; the SHIELD is the audio return and case ground.

If long cables are used (over 20 feet), a balanced

pedance circuit will prevent electromagnetic noise pickup.

To modify the 520D for balanced low-impedance output, re-

move the two screws that hold the grille in place, and care-

OLJ~

fully take the cartridge BLACK leads in half; and solder the BLUE lead from the cartridge to the BLACK lead from the cable (see Figure 2).

Insulate this connection and the free ends of the BLUE and

BLACK leads. Replace the cartridge and grille and fasten

with the previously removed screws.

The modified microphone is balanced low impedance only; the WHITE and BLACK leads are now the balanced audio output; and the SHIELD is case ground.

- - - -

39K

Dual lmpedance (as shipped)

INTERNAL CONNECTIONS

This Shure product is guaranteed in normal use to be free from electrical and mechanical defects for a period of one year from date of purchase. Please retain proof of purchase

date. This guarantee includes all parts and labor. This guarantee is in lieu of any and all other guarantees or warranties,

express or implied, and there shall be no recovery for any

consequential or incidental damages.

SHIPPING INSTRUCTIONS

Carefully repack the unit and return it prepaid to:

Shure Brothers Incorporated Attention: Service Department 1501 West Shure Drive Arlington Heights,

If outside the United States, return the unit to your dealer or Authorized Shure Service Center for repair. The unit will be returned to you prepaid.

of the case. Cut the BLUE and

FIGURE

GUARANTEE

MICROPHONE

low-im-

BLUE

Balanced Low lmpedance

Illinois 60004

IT------

27A1633(TI)

1980,

Shure

Brothers

Inc.

Printed

U.S.A.

REPLACEMENT PARTS

Cartridge

Cable

Rubberplug

Accessory Resonator

......................................

..................................

........................

R44D

70A2047

66A174

.90A3051

OPTIONAL ACCESSORIES

Quick Disconnect Adapter Gooseneck (6,12, or 18 in.) Gooseneck Mounting Flange

........................

................

.G6, G12, GI8

......................

.A47 .A12

AMATEUR RADIO USAGE

The Model 520D is ideal for amateur radio contests. The

microphone can be VOX- or footswitch operated. The

YE"-27 thread at the bottom of the case permits wall- or tablemounting using standard-threaded microphone accessories. Suggested accessories are the Shure 6-, 12-, and 18-inch

goosenecks (Models G6, G12, and mounting flange (Model

SW-1

boom-swivel mount.

A12); and the Atlas Sound Model

G18); and gooseneck

CONNECTIONS

The WHITE lead of the 520D is the low-impedance audio output; the BLACK lead is the high-impedance audio output; the SHIELD is the audio return and case ground. Most transmitters with a 3-conductor phone jack audio input use the tip for the keying circuit, the ring for the audio, and the sleeve for the ground.

Connect the microphone to a phone plug as follows:

either

the WHITE or BLACK lead of the 520D to the ring (depending on whether low or high impedance is required); the 520D SHIELD to the sleeve. This is for VOX operation.

If a footswitch is used, connect the switch "hot" lead to the phone jack tip and the switch shield to the sleeve.

FIGURE

FREQUENCY RESPONSE

To tailor the response for optimum speech intelligibility (especially suitable for amateur radio communication), make the following modifications (see Figure 3).

Remove the black rubber plug to the rear of the nameplate.

2. Clip off and remove the 39k resistor on the cartridge terminals.

Insert the supplied accessory resonator in front of the microphone cartridge (attached rubber washer toward

microphone grille). The cartridge shock mount is cut out to accept the resonator and hold it in place.

After the modifications are made, the response will be as

shown below.

+I0

-I0

20 50

FREWENCV

lpo0

HERTZ

lo.000

24000

TYPICAL TAILORED FREQUENCY RESPONSE

FIGURE