Shure 520D Data Sheet

222 HARTREY AVE.. EVANSTON, IL. 6 0 2 0 4 U.S.A.				1:!gT	MODEL 520D
8			1		MODEL 520D
MICROPHONESAND ELECTRONIC COMPONENTS					CONTROLLED MAGNETICB
TWX: 9 1 0 - 231-0048	.	TELEX: 72 -4381			MICROPHONE
AREA CODE 312/866-2200		CABLE: SHUREMICRO

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 boomor 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 highor unbalanced low-impe- 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

1I .

5 -10

20	50	I00	lpO0	10,000 2opoO
			FREQLENCV IN HERTZ

TYPICAL FREQUENCY RESPONSE

FIGURE 1

Polar Pattern

Omnidirectional

lmpedance (at 1,000 Hz)

Dual. Microphone rating impedance is 150 ohms (160 ohms actual) and "High".

Load lmpedance Range

Minimum Recommended

Low lmpedance. . . . . . . . . . . . . .I50 ohms		1,000 ohms
High lmpedance . . . . . . . . . . . . . I 5 kilohms		100 kilohms
Output Level (at 1,000 Hz)	lmpedance
	lmpedance
	Low	High
Open Circuit Voltage* . . . . . . . . -73.0 dB		-56.0 dB
	(0.22 mV)	(1.6 mV)
Power Level**. . . . . . . . . . . . . . .	-51.0 dB
'0dB = 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 (3% in.) long

Net Weight (with cable) 6309 (22 02)

27A1633(TI)

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 low-im- pedance circuit will prevent electromagnetic noise pickup. To modify the 520D for balanced low-impedance output, remove the two screws that hold the grille in place, and carefully take the cartridge O L J ~of the case. Cut the BLUE and 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.

------.	,	BLUE	IT------

39K	Balanced Low lmpedance
Dual lmpedance (as shipped)

INTERNAL CONNECTIONS

FIGURE 2

GUARANTEE

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, Illinois 60004

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.

Printed in U.S.A.

REPLACEMENT PARTS
Cartridge ......................................	R44D
Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	70A2047
Rubberplug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. .66A174
Accessory Resonator . . . . . . . . . . . . . . . . . . . . . . . ..	90A3051

OPTIONAL ACCESSORIES

Quick Disconnect Adapter . . . . . . . . . . . . . . . . . . . . . . . ..A47 Gooseneck (6,12, or 18 in.) . . . . . . . . . . . . . . . ..G6, G12, GI8 Gooseneck Mounting Flange . . . . . . . . . . . . . . . . . . . . . ..A12

AMATEUR RADIO USAGE

The Model 520D is ideal for amateur radio contests. The microphone can be VOXor footswitch operated. The YE"-27 thread at the bottom of the case permits wallor tablemounting using standard-threaded microphone accessories. Suggested accessories are the Shure 6-, 12-, and 18-inch goosenecks (Models G6, G12, and G18); and gooseneck mounting flange (Model A12); and the Atlas Sound Model SW-1B boom-swivel mount.

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 3

FREQUENCY RESPONSE

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

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

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

3.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

sI o

5 -I0

20	50	ma	lpo0	lo.000 24000
			FREWENCV IN HERTZ

TYPICAL TAILORED FREQUENCY RESPONSE

FIGURE 4