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a

havlri,g

ii. l /

2-

lnch

P.ll>e

thread.

Otller

stands

•Ul

roqui:re

III

sm1table

adapt.or.

Too

11

l

cro

•

J)floo.e

HI

c

1.1:5lU

on

•

rrt>u

:n

ted. and a

fork

l!lOunt

1nM

is

prov

l

d~d

$0

that

the

11icrop1

,o

n-e

11ay

be

fitted

to

the

d~s

lrc

o

posttion.

2

Connect I

QIIJS

As

i,h 1pi;ed

toe

llicro

.

ph.c,;ne

b

connected

!or

an

output

I

mpedMce

o•t

250

ohns, To coa

n.ttc

t

th~

nlorophone

!or

M

output

illll)B~e.nce

of

30

or

lJO ohms ,

Urst

l

ower

t.

oo

bott

·

o111

eovttr by

ri,·no'I'

trig

tbe

four

ll'll.ch

ine

110

r.,

11$

1u

·ound

the

rl~

of

the

coYer,

Pull

the

covttr

down

until

ttie-

trar:u;foriwr

hrmlna

!.

board

cocmection~

fff8

lll

·CC•

Q-&!1

ltd

Ii!!

'

Par

·

the

t)TOS)'lt r

C:i:11

b

14'

eon

-

nee

t .! ooa,

rtl'ter

to

Ci

gQ.l"111

3.

Dlrect iona1 c.har&cler i

st

ic,

The

e.dju

$

t~bla

shu

t

ter

over

tbe-

slot

ln

the

tuoo

lee.din,

to

thll

t1

<:

0L1Bt

le

l

abyrinth

lfil

l Y

loo

ro

tnt-0,d by

t:1

~

~.s.

or

a

screwdriver

ad-

J~$t~ont

oxtvnd1nt

th

rough

the

rear

sc

reen

!lu~b

withe.

do$1gn•tio~

plat

e.

The pl

ate

is

mrke<l

U'

, N and

n.

as

symbols

for

the

lHl

1-d

lrec

t

Iona

1. uo:n-dI.

rec

Um11:11

and

bl-directlooal

patterns.

Tln

e-

e

addH1ooal

ti

ark

1

l'.I

IS

L-

I .

l,-

2,

1l.J)d

L,.

3 a

re

1.1ae

d a.s

re-ference

points

tor

otber

directional

DO.tter•a

•bicb

me.1

be-

obta

iDed.

&efer

to

f1gllln

-ii

ror

~he

~tterrus

uaociat.ed

wHb

eiu;h

o!

the

.$1~

&ymbo

l

&,

Sto

pe

are

Dr

ovlded

oa

the

COC1tinu0usty

-

v~rlablo

puttern

selector

•t

tho

Gh

1111.rked

po.i,;itioni!S,

•lt.ho

•ugh

tile

Ghutter

~•1

bo

set

e.t

any l•

t~r~ediate

IJ()GitiOIL

rreQuency

Respon~e

At

U1,e

b:ott

0

11

.

of

th

.e

lo•e

r

she

11

h

11

!';Cfil

wd, i''lil r •O

PI!

rnw

r.t

so

lee

tor

11111.:rked

Iii

{

mlJ.$

le)

V1

and

v2 (

vo

i c o

},

The-

voice

p,os 1t

100a

c

u1

1

n-0

ct

1:1.

react

.

or

a.crass

the

eratire

secon.de.rJ'

or

t,n,r

t o(

U10

!wl:

O

«::m

-:

h•:rY

o f t be

oat

~

ut

t

~

-

fot'l'lllr .

t!r

~i:c:nrHn.g

011

tM

:sw1t¢

:h

t1oa

I

t1on

(

!l.f!e

d

[i!JINui

. r

leure

3).

Refer

to

tia:ur,e. 6 .

for

the

fr

eQ

u,e

11-cy-re

s1>-0oae

eilarac

te-r

1st

ice

ot

each

.

sett

1fltll. As

cao

be

&e-eo

trorn

tile

c

unes.

the

re

!lct

o.r .atterrne.tes tJle lo•-frei:i.u.eocy respot1:sa

Thia

i!9

especially

d·

esirnble

•1,ea

the

micro

~

JJbone,

is

les.s

tbe.rt

tJtree

fe-et

from

t:be

soiurce

a(

so

mid

a

n.d

tbe

low-fre

queracy :re:si.x.rnM 11otild

oth1~

r111se

be exe.e1er:ated.

P

ha

.si

ng

Tl

it!

T:

nlc'

77

•

DX

J,Ucror.hooe 1

a:

ptiae.,e,tl

:so

that

tile

red

cab

le

i

e-11.d

is

e l.

ec

t r ic!I. 111

po$!

t

ive

•ht1n

the

r;ound

cireuuNt

on

the

rr

o

nt

or

tbe

a1cropbooa

Js

in

the

p,o:111t

l.ve

Ital

f

of

tb111

c:,c

l

e.

lllben

tbe

oot

puts

or

ho

or

,

11ore-

mic ropllontl'e

&nl

connected

1ot<.>

a

mh

.

ins

c.ircr;iit,

1t

ts

ne-c~se.rr

tb111t

the

Olitl)Utili

of

a.U

auch

11icro-

1Jfl

o

lle:s

tte.

"0

the

a

a.me

tih.

nllle

te

In.tion ,

Ot

be-

r-

•

he.

the

output

of

one

m1<

:i-opho11e •111

Oll

f.l

041ll

enc

output

of

11:notber-,

result1ni

h1

11,

niduc

t ion

in

out

put,

111.n,d

1nt

rodoc

.I

01

var,tn,g

d(lg:re0ill

o!

di

&tort1

o

D.

To

check.

tlbt,l

ph

11

$ing

of

t•a

or

rore

alc:ro

-

phon.e

:i.

.

coaae

ct

on.e

ti 1cro;i:bomi t o the

11::isoc

l -

11

tu

d

e.mplifier

loput

~nd

set

the

ro

l

ume

coritrol

to

obtdn

U1

-e

·

desired

output

. wltile

t1ilki11g

Into

t.he

11iero11ilooe

. Tiii.

rn.

connect

the

se

c:

oad

r11.iero1'-hone

In

pa.nl.llel

•l

th

tbe

fir

.

e:t

1

H1d,

•Hhout

cha.ne:ina:

the

v

o,

lum

lJ

contro

l

settl.ng,

hold

both

microphon..es

closo

toget

.

ber

ui.cl

tuilk

into

them.

It

the

vo

luoo

dec:re

asos

ri-011 t be

pr

,e,v

to

u.!I

ltH•e

I,

rn,•er

s,e

the

conn~ction8

of

one

of

th~

aicropllone

cab

lea

11.

t

tho

11icrot1bone

Cl

l.

Uit.

Check

e1Lcb

addJtlo~al

~icro¢tone

tor

phasiDC l•

t~is

ma.nDe-r

, ar.,d , 1f

nece

su

r.r.

re

'ferse

ttie

ce.ble

co

•

neetlons

to

correct

tbe

phaa

1

11i

to

agr~e

wi

tb

that

ol

t!bit

m10.t"()p1iooo

a

lrea.d:,

connee:teCI

,

lfbem

tile

~o'l.llld :!lt;Jun:o

ts

<Ur4'.lctcod

t.

o¥tarrJ

the:

back

o!

the

mic rof;Jl1

00

.o, t

hen

w111

bCJ

a.

l

arge

pb111.&e

:.

ti

Ht

wl

nrn

et,ang

u,i

t l

tr:;

~at

tt:r11

se

l

eclo

r

frOC11

bl

-

d1tect

tionu.l

to

t1CJ.n

•<llnJ"

C:

tic

1

11-

11l

or

llw

t',e-\'(!

nn

i.

Th(!

!lo.f1Ji!lt.. •aY

to

11\

•0

1d

urid

aira

bh

dlt(lctlooa.l

crtects

ruult1ng

rr

om

tb

e above:

is

to

set

mi

c:rophooie

s O

il(!

re.tin&

olo~

tc>

one

0111o0ther

on

tile

a.s.rre

d Lrec:t

tonal

r

(l&po~

.

$~

l')(l!U'tloo,

or

at

least

a.v

o l

Cl

tun·

ln1

some

on

t

ne

noo

-d

1

rec

t.

lom1,

l patte-

rn

1rnd

t

be

others

or.1

the

bi

.

-d

l.

rect

10.na1

pattern

.

DI

r

ed

i

ona

I

Setting

1'he

proper

J;,O:!l

i t io

r1

of

the

tJBIU

e

rn

$

(l-

l

ect

or de

ri

er

u:

l:!l

ui;,0111

t.

tie

part1culo.r

Lr.isl

.-

L•

latioo

. The

s:11ne

l1

olds

trne

tor

the

1>lac<

Hte11t

of

the

m:tero11tror

n.1

. CoratrnH

fh;ure

4 f or

tJw

direct1one.J

5111.tt,e-rn!S

oC

tile

six

ref.e-rer.ic(!

i>()..~itiom,.

I

.f:1

"9

I

~

'.

O.

·

&BON

I

i

C

c,

s,,.

,r

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o

SO

Lr'EJ:

l

,;J

'

TO

<l"

IE

N L.l-,4D - -

~

EO

/

fYPF:

77

0 6.. 77

DX

MICROPHONE-

_-

,

eruo

I~

~••Rto

·

e•

•~•

e "

ED

: ·,

,.

·

-·

~

LK

. .

~

I,

..

'

~·

61(..

~

GR

I-J

, I

+-

e

.:,

'RN

1s

o

.J\..

1I ~ -

.,_

. i s

o.n.

CAB

LE-

CO

NNE-CT

IONS

M I • 4 0 4 5 E ,..,, U/·404

ff

Ml·

11:)0

bBw/,J/

-//

~C

M-1

49778

3

Figure 3 - Schematic

and

Connection Diagram

Frequency Response

Settings

Por sound

sources

greater

than

three

feet

from the microphone

the

frequency

response

selector

can

be

used

in

the

M

position

for

any

of

the

directional

resl)Onse

patterns.

If

the

non

-

directional

characteristic

is

used,

no

low-frequency

attenuation

should

be

re-

quired

even

for

very

small

distances.

If

the

bi-directional

or

uni-directional

patterns

are

used, low-frequency

attenuation

will

be

required

when

the

sound

source

is

less

than 3

feet

from the microphone,

unless

special

effects

are

desired.

It

is

suggested

that

the

v1

position

be

used

for

distances

down

to

l

foot

and

the v2

position

for

still

shorter

distances.

Refer

to

figure

5

for

frequency-response

curves

of

the M, v1, and

v2

settings.

Hum

may

originate

in any

part

of

the audio

system. In

the

microphone

circuit,

it

may

re

sult

from ground loops

or

unbalance caused

by

improper

cable

connections

to

the

pre-

amplifier

terminal

board

or

microphone plug.

Hum

may

also

be

induced

into

the microphone

transformer

or

ribbon

by

magnetic

fields

emanating

from

J)OWer

transformers

or

electri-

cal

machinery. In the

Type

77-D

Microphone

the

design

of

the

ribbon

circuit

and

the

transformer,

and

the

thorough

shielding

of

the

transformer

have reduced

hum

pickup from

these

sources

to

a

minimum.

In the event

that

exceptionally

strong

fields

are

encountered,

the induced

hum

may

be

minimized ~Y

turning

or

tilting

the

microphone,

or

changing

its

location.

Turning

the

frequency

response

selector

to

the v1 or v2

positions

•ill

also

reduce the

hum

together

with the

overall

low-

frequency response.

MAINTENANCE

It

is

recommended

that

no

attempt

be

made

to

make

repairs

other

than

replacement

of

screens,

transformers,

mounting

parts

and

cables.

Por

microphone mechanism

repairs,

return

the

unit

to

the

factory

.

Secure

a

Repair Order and

Retunied

Apparatus Taf

from

the

RCA

Field

Office

or

write

to

RCA

Service

Company,

Returned Apparatus Control, Canden,

H.J.

Attach the tag,

properly

fiHed

out,

to

the

damaged

equipment and send the equipment

and

the

repair

order

to

the manufacturer.

CAllI'ION:

To

prevent permanent

dama.fe

to the ribbon

do

not

test

continuity

of

the microphone with a

circuit

checker

without

connect

inf

a

resistor

of

at

least

50,000

ohms

in

series

L-1

POSITION

UNI-DIRECTIONAL

PO51T

ION

Bl-DIRECTIONAL

POSITION

L-2

POSITION

NON-DIRECTIONAL

POSITION

L-J

POSITION

Figure~

- Directional Patterns

5

OP£t-l Cl RCIJIT RE 5 P

ONS

E:

OF'

A TYPICAL

TYPE

77DX

MICMPHONiE

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Figure

6 - Parts Locat Ion Diagram

of

Ml-1'01'5-F

wi th the checker, When

testing,

the

micro

-p

hone

lines,

observe the

same

-precautions

or

rrnke

certain

that

the

micro-phones are

disconnected.

To

remove

the

top

screen

assembly

for

re-

placement,

first

remove

the

side

thumbscrews

and

mounting

hardware

at

the

top

of

the

microphone

fork.

Then,

unscrew

the

two

machine

screws

on

the

side

bands

near

the

top, and

11ft

the

screen

assembly

off

the

microphone .

To

remove

a

transformer,

reactor

or

cable

for

replacement

purposes,

first

lower

the

bottom cover

as

described

under Connections.

Before removing the

cable

,

be

sure

to

loosen

the cord guard and cable clamp.

CAUTI

ON:

Keep

the microphone ai..oy

fro

m iron filingrs

or

.rrcgrnetic

dust

.

Al

thougrh

the screens provide

ex-

cel

lent

protection,

minute iron

particles

.

corrunonly

found

on

work

benches and in rrnintenance shops

rrny

be

drawn

througrh

the screen by

the powerful TTllfnet.

If

allowed to

accwnulate, these

particles

=y

TTJlr

the

quality

of

reproduction,

REPLACEMENT

PARTS

The

following

parts

list

is

included

to

provide

identification

when

ordering

replace-

ment

parts.

Order from

RCA

Replacement Fbrts

Department,

Cam:ien,

New

Jersey,

giving

the

Stock

Number and

Description

of

the

parts

wanted. Replacement

parts

supplied

may

be

slightly

different

in

form

or

size

from the

original

parts

but

will

be

completely

inter-

changeable with them.

Desc.-iction

_

Mf-~0~5-F

Acoustic,

1i

ne

as

sy.

less

bJnd,

transforrrer

&

switch

assy.

Bushing,

bras

s , microphone

fork,

sw

ivel

0.296"

lg.

x 0,373

0.D.

x

0,261

I

.D.

with

9/ 16

dia.

X

0.030

thick

shoulder

Clamp,

cable,

incl.

bushings,

hex

nut,

and

screw

Cushion

Jl'()U~ting

assy.

complete

Cushion,

rubber

1•

dia.

x

9/16"

thick

with

1/

u•

dia.

hole

in

center

Fork, microohone

fork

casting

only,

wi

th

1/ 8"

oipe

threaded

hole

1n

base and 1,

3/9•

hole

in ends

of

prongs

Gasket,

cable,

rubber

7/16"

0.D.

X 9/32 I.

D.

X

7/32

thick

Hut, thumb,

1·

di;i.

x

3/16"

thick

with

1/

9•

pioe

threaded

hole

in

center

fork

base

locking

lH

U

WIN

UJ

-.,21•

,o

,u

-,;,,1

r,

Jt(

1CTCA

,,,1,0•

TMUWINUT

..

,s,,,

CUSHION

_._,trr

CUSH

I

ON

WOUNT I

ilolG

ASS(MIL

Y

-,un

• 1

81011

CL

AWlt

........

7

LIST

OF

PARTS

S

toe

k

Ko.

9)981A

95218

19828

50925

UU677

18393

Ull6

71

50907

' ' " f flt

11'1472

TMttUS

T

W&SHtA

,.,11,0,

acou,11c

Li

NC

ASS[

IIIIL1'

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NUT

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9S221

Description

Nut,

cushion

retain

i

ng

knurled

cap

nut,

~ith

•1

1/

a-;2

insioe

thread

Nut,

~n~rled,

cable

guard

spr

i

ng

rf?ta1n1ng,

5/8

o.o. x 7/

16

lg.

with

9/16-18

thread

Nut, thumo,

knurled

fork

sw

ivel

3 /

11•

o.o. x

7/32

thick

with

1/ 11-28 tapped

hole

in

center

Plate,

designat

ion

for

poly-

direct

i

onal

char

. , d iamond

shape

with

t/1i-

dia.

hole

in

center

& 2

mtg.

holes

.1011•

d

ia.

S

creen

Assy. compris i

ng

front

&

rear

screen

& band

Screw, washer hd. J!Z-56 x

J/16"

lg.

for

screen

&

cover

Soriny,

cable

guaro

Stud,

cushion

mtg.

2-3/32•

lg.

with

1/a

pipe

thre3d

one end,

1/11•-20 x 3 / 8

lg.

thread

other

end

jlll

L

ATf

,.,..,,

o,~

INO IC

AT

0 "

~-

.-St102:

S

to

e k

Ko

.

95216

50908

95219

205158

50906

521169

lt'illllO

9J817

1111

0 10 •

&1,tWIL

'

STIIU

IN

Jt(L

,.

1[,

,~1•11

SIJIII INO

..

,

...

,o

CAIL(

wt

-

•sc

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I

P"Y

L(NOTH

ll(Alt

YI

(•

, . ,,

••••

J

Figure

7 - Parts

Location

Diagram

of

Ml-11006-C

RCA

Microphones

Description

Ge

n

eral

In

for

mat

i

on

The

excellence

of

RCA micro-

phones is the

result

of

continued

effon on the

part

o(

engineering

and

production personnel to

produce

a

superior product.

Out

of

this work

have come the se\'eral types

of

broad-

cast microphones listed in

the

cata-

log.

There

i considerable

overlap

in

the applications of the various types,

but

each does possess

certain

attri

-

butes which make

it

particularly

weir

suited to some specific applications.

These have been noted for each

microphone

in

the catalog in

order

to assist

in

the selection

of

the micro-

phone best suited for

the

intended

application.

High

Quality

Broadcast

and

T

elevis

i

on

Microphones

Broadcast-type microphones such

as

the

Types

BK-IA, BK-5B, BK-6B,

BK

-I I

A,

BK-

12A

and

77DX, all have

certain common performance criteria

which make them especially suited

to this application.

They

have smooth

frequency-response

characteristics

over the

audio

range, low distortion,

high

output

level

s,

well-shielded out-

put

transformers to

prevent

hum

pickup,

and

where necessary, are

shock

mounted

to reduce the

pickup

of low frequency

building

rumble.

Performance features which are

unique

to each

particular

type are

listed

and

the applications discussed

in the catalog.

Publ

ic

Address

Mi

crophones

for

Broadcast

Use

Public Address Microphones such

as

the SK-30, SK-31, SK-39, SK-45B,

and

SK-46, have been designed as

economy microphones.

In

general.

frequency range

and

sensitivity ha\'e

been sacrificed to some

extent

in

order

to gain ruggedness

and

lower

cost.

The

response limitations should

be

borne

in

mind

when these

microphones are used in broadcast

applications.

Unloaded

Transformer

Input

RCA Broadcast licrophones are

designed to work

into

a microphone

preamplifier whose

input

transformer

is

unloaded.

Under

this condition

of

operation

the voltage

appearing

at

the

input

of

the first amplifier stage

results

in

a gain in signal-to-noise

ratio

between 3

and

6

dB

as com-

pared with a matched resistance

load.

The

exact value will

depend

on

whether

the

major

source

of

ther-

mal

noise is

in

the

microphone

am-

plifier

or

in the microphone.

Microphone

Resistance

Loading

Microphones in which the moving

system is highly

damped

will in

general have

their

frequency response

characteristics little changed

by

elec-

trical loading.

The

BK-IA

and

BK-

6B

are examples

of

this.

Microphones which show

output

impedance variations with respect to

frequency will have their response

characteristics adversely affected by

resistance loading.

The

Type

BK-SB.

and

77-DX (in the bi-directional

and

uni-directional positions) are typical

examples. Resistance l

oading

of these

microphones will generally result in

a loss in low frequency respons

:!

.

150

Ohms

vs.

250

Ohm

s

\

,Vhen

microphones are connected

to

unloaded

input

transformers, im-

pedance

matching

is

not

a considera-

tion

and

the

effects

of

connecting

microphones with

an

output

im-

pedance

of

250

Ohms

to a micro-

phone

amplifier designed to operate

from a

150

Ohm

source

and

vice

\'ersa will usually be

of

small conse-

quence.

The

effect on the level

is

shown in the

tabulation

below.

1

Mic. Output Level Change

Impedance dB

250

0

~

150

-2.2

Amp.

Input

Designation

250

--

0

In

addition

there will be some

c

hange

in the cverall response-

frequency characteristic of the ~ystem

below I

00

Hz

and

above

5000

Hz,

the

magnitude

depending

on

the con-

nection

and

the design of both the

microphone

and

the

amplifier

input

transformer. Variations in re ponse

with

the

usual broadcast

quality

mi-

crophone amplifiers will

in

most

cases not exceed ± 2 dB.

When

microphones are connected

to

a resistance load the following

changes in level will result when

the

output

is

referred to a matched

condition.

Mic. Output Level Change

l Impedance dB

250

~I

-2.5

150

0

Load

Impedance

150

--

0

Mic

r

ophones

Shipped

Les

s

Plu

g

RCA microphones are supplied

less the

plug

for connection to

tl1e

wall

outlet

or

amplifier system.

This

is

done

to allow the user to select

any desired

plug

.

As

a convenience,

popular

types

of

Cannon

plu

gs are

catalogued

and

they may be ordered

as an accessory

if

desired.•

Microphone

Mounting

RCA has standardized

on

the

rugged ½-

inch

pipe

thread

for broad-

cast

microphone

mounting.

This

size

thread

makes

it

easy to

add

micro-

phone

stand extensions, booms, etc.,

for they may be easily made

up

lo-

cally from

standard

½-inch pipe and

fittings. Stands listed for use with

microphones

having

¼"-27

thread

will accommodate RCA Broadcast

i\ficrophones by the

addition

of

an

adapter.

• Microphones are

,hipped

connected for 250

Ohms aince

In

normal usage

11n

Improved

signal to noise ratio results when connected

to • 150 Ohm preamplifier input.

•

t

•

I

•

I

•

t

•

I

•

t

I

J

•

Effective

Output

Level

When

:1

mic

r

ophone

is

connected

to

an 11nloadcd

input

tra

n

s(ormcr

it

s

power

o

utput

c:rnnoL be expressed

in

dBm

becau

se

no

appreciable

power

i

,;

deli\·

ere

cl

by

1h

e

microp

hone. T he

logi

ca

l

approach

Lo

the

problem

is

Lo

arr

i\'e

at

so

me level figure which,

when

com

hi

ned

with

the co

n\'ention

-

ally ·

measured

amp

lifier

gain,

wi ll

give

the

co

rre

ct

output

level for

the

combination.

Th

is figure

is

listed

in

the

cata

l

og

for each

microphone

and

is call

ed

the

Elfecti\'e

Output

Leve

l.

It

diff

er·

from

the

E

IA

sta

nd

ard

rating

G~,

in

th

e

value

of

sound

pres•

s

ur

e a

nd

so

ur

ce

impedance.

The

I::

IA

rating

co

mputation

is based on a

so

ur

ce

impedance

of

150

Ohms

for

all

micropho

nes hav

in

g o

utput

impe-

dan

ces betw

een

75

atid 300

Ohms

,

and

on a sou

nd

pressure

of

0.0002

dyne per

square

ce

ntim

eter.

The

Effecti\'e

Output

Le\'el

ca

l-

c

ulation

i based

on

th

e

nominal

microphone

imp

edance

and

on

a

sou

nd

pres

s

ur

e

of

JO

dynes

/cm2•

The

E

IA

sta

nd

ard

defines

th

e

sys-

tem

rating

(G~,)

of

a

microphone

as

the

rat

io in decibels rel

ati

\·e

to

0.001

Watt

p

er

0.0002

dyn

es

per

square

cen

tim

eter

of

the

maximum

el

ec

tric

pow

er

a\'ail

ab

le fr

om

the

mic

ro

-

phone

to

the

sq u

are

of

the

undi

s-

turb

ed

so

und

field

pressure

in

a

plane progressive wave

at

the

micro-

phone

position.

Expressed

mathe-

matically:

E

G,.

=

(20

log

,.P-

10

log,.

RIIR)

-

50

dB.

where E =the

open

circuit

voltage

of the microphone

P =the undisturbed sound field

pressure

R,.. =the microphone rating

impedance

Electrical reference level

==

.

(JOl

Watt

Sound pressure =

.0002

dynes/

sq.

cm.

\\'hil

e

thi

s

may

look

complex

the

app

li

ca ti

on

is s

imple

.

For

all prac•

tical

purp

oses

the

output

level of the

microphone

is

obtain

ed by

ad

din

g to

G.\I

•

the

so

und

pressure

level

relative

to 0.0002

dynes

per

squ

are

centi

•

me

ter

. T he

sound

pre

ss

ure

lc

\'

cl

of

the

program

material

can

he meas.

ur

ed

with

any

of

th

e seY

era

l an1il-

ab

le so

und

l

e\'e

l

met

ers.

Hum

Pickup

Level

An

arbi

tr

ary

standard

60 Hz AC

field of

10

-3

ga

u

ss

ha

s

been

estab-

li

shed

as a

reference.

It

is

fa

irly

repr

e-

senta

tive

of

fields m

easured

at

typi

ca

l

microphon

e l

ocatio

ns

in

broadc

ast

stud

io

s.

T he

hum

level is

referred

to

.001

Watt

and

is

calc

ul

ated

in

the

same fashion as

the

Effective

Output

Level. u

ing

as

the

o

utput

vo

lt

age

th

e vo

lt

age

produ

ced by

th

e

stand

-

a

rd

fi

eld.

Chart

Showing Microphone Applications, Chief Characteristics and Recommended Mounts

fffedive

Ou1put

Directional

Output

Type No. Use3 Charoderislic Leve/I Impedance

and

G

.1/,

Ohms

77-

DX

Program -

53

dBm

30/150

Announce

Poly-directional

GM

-147

dB

250

BK

,

1A

Program Semi•

and

-52

dBm

30

/150

An

nounc

e Non-directional GM -

1"6

dB

250

BK

-

58

Program

-57

dBm

30/150

Announce

Uniaxial

Gll

-

151

dB

250

BK

-

6B

"Off-Mike" Semi-directional

-65

dBm

30/150

Speech

G~

1 -159

dB

250

BK-11A

Program Bi-directional

-56

dBm

30/150

Announce Ghl -150

dB

250

BK-12A

Program Non-directional -

60

dBm

30

/250

Announce

G

11

-154

dB

8N-

10A

Remote Semi-directional +

6VU

600

Program

KU

-

3A

Program

-51

dBm

30/150

Announce

Un

i-

directional Gn -145

dB

250

SK

,30 Public Address Omni-directionol -

55

dBm

30

/250

Paging

GM

-149

dB

~ublic Address

-57

dBm

SK

-

31

Paging Omni-directional below JV/ 30,000

dyne/cm

i

SK

-39A Close

Up

-54

dBm

250

Announce Semi-dire<:tionol

GM

-148

dB

Intercom

SK

-

45B

& Talkbock Semi-directional

-56

dBm

200/15,000

Gy

-150

dB

Radio &

TV

-58

dBm

SK

-46

Announce

Bi

-directionol

GM

-150

dB

200/15

,

000

1

Re

ference level 0.001 Woll, sound pressure 10 aynes per

square

centi-

meter.

This

corresponds to a roting by tho

EIA

system

al

a sound

pressure level of 94

dB.

: level referred lo o

hum

field of

,o

-3

gouss.

Frequency Mox.

Hum

Response

Pic/c,up finish

Hz

Leve/1

Satin Chrome

30-20,000

-128

dBm

&

TV

Gray

Satin Chrome

50-15,

000

-102

dBm

&

TV

Gray

30-20,000 -128

dBm

TV

Gray

60-15,000

-112

dBm

TV

Gray

Stainless Steel &

20-20,000

-130

dBm

TV

Gray

6().18,000 -120

dBm

Bronze epoxy

& matte

gold

80.12,000 -112

dBm

TV

Gray

30-15,000 -122

cJBm

Two-Tone

Umber

Gray

50-14,000 -115

dBm

Midni

ght

Blue

50-1",000 -90

dBm

Midni

ght

Blue

70-10,000

-105

dBm

Two-Tone

Umber

Gray

-106

dBm

70.12,000 -88

dB

below

TV

Gray

1 Volt

-115

dBm

Satin Chrome

40-15,000 -98

dB

below &

TV

Gray

1 Volt

3

For

details refer to description of eoch particular type.

4 G1c =

(EIA

rating)•

~

Also

available

in

TV

Gray

01

Ml-11006-C.

Stand

Boom,

Desk,

Floor

Hand,

Desk

,

Floor

Boom

,

DHk,

Floor

Microphone

Lanyard

Desk, Floor

tavalier,

Clip, Hand

Hand

Boom,

Desk

,

Floor

Desk, Floor

Deslc,

Floor

Desk, Floor

t

•

t

•

t

'

•

t

•

t

•

'

•

t

•

t

AUDIO EQUIPMENT

Ja

ck

Pa

nel:

Double,

Type

BJ

-

24

......

.

Si

ngl

e,

Typ

e

BJ-

12 .

Tip-Rin

g-

Sl

eeve,

Typ

e

BJ

-2

0TRS

Lac

in

g

Co

rd

k 6

Lacing

Tap

e:

Na

tural

Colo

r Nylon,

60

0

yds

..

.

...

..

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

Na

tur

al

Colo

r

Ny

lo

n, 5

00

yds

.

Fungu

s

Pr

oo

f .....

Light

Rela

y

(Fo

r all Consolett

es

except 76

se

ries)

Ligh

t

s,

Studio

Warn

i

ng

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

...........

.

...

.

Li

miter Module, Ty

pe

BA

-

46A

...........

.

Limiting

Amp

lif

ie

r,

BA-43

/

46

Line Equalizer,

Type

BE-2A

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

......

.

Lou

dspeak

ers

:

LC

-

18

LC

-

9A

..

.

SL-BC

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

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

.

....

.

....

..

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

.

...

..

...

....

.

..

.

..........

....

.

SL

-128

Lubricated

Tape

,

1700

ft.

on

7"

ree

l .

....

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

.....

.

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

.

...

..

...

..

....

.

...

.

...

........

.

....

.

Mat:

Aluminum

Ep

o

xy

for Single Jack Panel

Aluminum

Epoxy

for Double Jack Panel

Meter:

Remote

Li

miting

(For

BA

-

43

/

46)

Ga

in Reducti

on

for

BC

-7 (For

BA

-

25

Only)

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

.

.........

...

........

.

.......

..

..........

.

Simpson

VU

.

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

.....

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

...

...........

.

..

.

..

...

...........

.

......

...

....

..........

..

....

...

.

VU

(F

or

BC

-7/

BC-8

)

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

.

...........

..

.....

...

.....

..

...

.

...

..

.....

..

.

Meter Panel,

Typ

e

61

-

56

....

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

Microphones . .

...........

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

Aerodynami

c,

Type

SK-39

..

...

..

...

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

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

......

.

Dynam

ic

Low

Impedance,

Type

SK-30

...........

...

.

.....

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

...

..

.

...

..

.

..

.

..

....

......

...

Dynam

ic Hi

gh

Impedance,

Type

SK-31

........

...

......

....

..

....

.....

.

...

.

...

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

.

..

.

Microphone/Amplifier.

Type

BN-lOA

...... .... .

....

...

..

. .

...

.

.....

.

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

...

.........

.

Miniature

Dynam

ic,

Type

BK-6B

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

....

.

....

...

......

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

..

....

...

....

...

..

.

Pressure,

Type

6K-1A .................

...

.

....

.

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

.

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

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

...

.

..

...

..

......

.

..

.

Pressure,

Type

SK

-

458

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

..

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

.

.....

.

.....

.

..

.

...

.

.......

.

....

...

.....

...

..

.

....

.

...

....

..

Polydirecti

ona

l,

Type

77DX

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

...

.

....

...

..

.....

.

........

.......

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

....

..

...

..

Polydirectional,

Low

Lustre

Gray

,

Type

77DX

..

.

...

..

........

.

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

.

Subminiature Dynamic,

Type

BK-12A

.....

.

...

.

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

..

......

.

..

........

.........

...

..

....

..

Uniaxial,

TV

Low

Lustre

Gray,

Type

BK-58 .............

...

...........

..........

.

...

..

......

.

Uni-Directional with Hanger,

Type

KU-3A

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

.

.......

...

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

....

..

.

...

.

Ve

l

oc

ity,

Type

BK-llA

..

......

...

.......

..

.

..

.......

.

......

.

....

...

........

.....

.

......

..

......

.......

...

Velocity, with cable,

Type

SK-46

....

.

..

.

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

.

..........

.

...

..

..........

.

.......

.....

..

.

...

.

Microphone/ Amplifier,

Type

BN-lOA

Microphone Adaptors:

½" Pi

pe

Thread to

%"-

27

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

.........

.

.......

..

.

....

.

....

.

.....

.

....

..

...........

.

....

.

%"-

27

Stand to ½" M

1h

e Thread .

....

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

....

.

....

..

.

....

.

....

.

......

.

....

.

........

.....

Swivel

%"-27

(For

SK

-

30

/

31

Microphones) .

..

.....

.

....

.

...

..

.

..

...

..

....

...

..

....

.

....

.

..

.

12

Catalog

References

P

ag

e Sheet

86

B.1

508

86 B

.150

8

86

B.15

08

86

B.150

8

86

B

.1503

86

B.1

503

42

B.l

10

2

34

B.

1115

53

B.14

29

52

B.

14

29

89

B.

1509

123

8

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127

6.1810

125

B.1800

126

B.

1808

119

8.

1725

86

6.1508

86

B.1

5

08

53

B.

1429

34

B.1115

88

B.1509

34

8.111

5

88

8.15

09

5 8.lC

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20

8.1026

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B.1027

19

8.1027

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6.1436

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B.1012

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8.1028

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B.1009

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B.1009

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8.

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B.1018

18

R.1051

14

B.1024

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B.

1029

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B.1436

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8.1030

25

8.1030

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B.1027

Ml

No

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Pr

i

ce

11

645 $

55

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00

11

646

33.00

11

666

55

.

00

117

19·A

5.00

l 17

19

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4.00

1171

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00

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170

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ES

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11706

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es

31.00

each

114

5

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195

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00

11454

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11456-A

495

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00

1175

2

42.00

11411-B

176.40

ES-11423

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25

38311

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14

.

70

38315

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15

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90

11986

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11647

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Al

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7.76

:t: 2

37431

RCA

Parts

#

6H0107

RCA

Parts

::53064

RCA

Parts

;;

226033

RCA

Parts

l 12

65

·G

159.00

12039

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25.50

11030

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11031

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31.00

11023

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11017-A

90

.

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11007

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12045

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39.00

4045-F

224

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11006-C

199

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00

11024

99.00

11010

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165

.

00

1000

1

-D

675.00

11019

110

.

00

12046

83.00

11023

-A Discontinued

12053

3.00

11021-4

1.00

11032

3.00

RADIO CORPORATI

On

Of

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commERCIAL

ELECTROnJC

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Radio Corporation Of America 77-DX User manual

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