The Fisher MPX-100 Installation guide

THE

FISHER

MPX-100

UNIVERSAL

Stereophonic Multiplex Adaptor

FISHER

MPX-100

is designed to adapt your FM-AM or FM

tuner to receive multiplex broadcasts in full stereophonic sound.

The experience gained from years of leadership in the design and

manufacture of FM tuners has been applied to the design of the

MPX-100

and has made it the best performing and most convenient

multiplex adaptor

111

existence. The exclusive FISHER STEREO

BEACON is a~~tontaticallyilluminated when you tune to a multiplex

program and turns off as soon as the station reverts to ordinary mono-

phonic transmission. At the same time, the FISHER Automatic Switch-

ing System senses whether the program transmitted is stereo or mono-

phonic and switches the

MPX-100

into the proper operating mode, thus

making it unnecessary to switch back and forth between stereo and

mono on your adaptor. Feedthrough connections for all types of tuners

arc provided, even when the

MPX-100

is turned off. Two separate

noi~cfilters can be operated by a single front panel sw~tch.One filter

oiTectb: the noise in the subcarrier only, thus providing full frequency

rewpoose; the other filter is designed to provide a steep roll-off al~ove

lor reception of multiplex signals under more difficult conditions.

Most important of all are the careful attention to every detail of manu-

facture and the top-quality parts which have given FISHER products

a world-wide reputation for remarkable durability and outstanding

reliability.

INITIAL ADJUSTMENTS

FISHEII

tuners and receivers will give excellent results when.used

with the

MPX-100.

Your MPX-100 has also been designed to oper-

ate with any tuner or receiver employing either a ratio detector or a dis-

criminator to demodulate the FM signal. Naturally, a multiplex adaptor

designed to operate perfectly with such a widc variety of tuners must be

provided with special controls. As a result of careful design and the use

of precision parts, however, it was possible to reduce the number of

controls on the

MPX-100

to only three: the Separation control on the

rear panel, and the Output Level controls also on the rear. The Separa-

tion control must be adjusted to provide the maximum degree of

stereo separation between channels for each particular model tuner.

In addition, two MPX input jacks are provided on the rear panel,

one to match tuners with low level outputs and the other to match

those with high outputs. These adjustments need be made only once,

when installing the

MPX-100.

(:otts~~lt

the Installation Guide on page

for the correct MPX

input jack and Separation control setting for your tuner. If your model

tuner is not listed, determine whether it employs a balanced ratio

detector. unbalanced ratio detector, or discriminator.

TABLE

OF CONTENTS

INSTALLATION GUIDE

MULTIPLEX STEREO

PAGE

GENERAL INSTALLATION AND

OPERATION INSTRUCTIONS

INSTRUCTIONS FOR OWNERS

FISHER TUNERS AND RECEIVERS

CUSTOM MOUNTING INSTRUCTIONS

Ratio DetectorTuners

The MPX output jack of all ratio detector tuners should be con-

nected to the LOW LEVEL input jack on the rear panel of the

MPX-100.

The Separation control on the

MPX-100

should be set at

for unbalanced ratio detectors and at 4 for balanced ratio detectors.

Discriminator Tuners

The Separation control of the

MPX-100

should be set at 4.5 for

all discriminator tuners.

the maximum output of the discriminator

(at the MPX output jack) is above

1.5

volts, connect the MPX output

of your tuner to the

HIGH

LEVEL input jack on the rear panel

the

MPX-100.

the maximum output is below

1.5

volts, connect the

MPX outj~utof your tuner to the LOW LEVEL jack.

NOTE:

your instruction manual does not contain this information,

you may have to contact your dealer or the manufacturer.

you find

it impossible to determine the maximum discriminator output of your

tuner, use

the

HIGH

LEVEL jack initially. Change to the

LOW

LEVEL

jack if the STEREO BEACON fails to light during a-multi-

plex transmission from a weak station.

120V

300W

MAX

I I

105-12OV

OUTPUT SEPARATION

OUTPUT LEVEL

ToTuNEa@Y$FL

MPX

OUTPUT

k%L

INSTALLATION

GUIDE

TUNER CONNECT TUNER

SET SEPARATION ~px

OUTPUT

MODEL

CONTROLAT: JACK MARKED

Fisher

FM-40

FMSO

FM-9O(X)

FM-100

FM-200

90-R

90-T*

100-R

100-T

101-R

202-11

202-T'

TA-500'

5oo.S

600 (Serial No. below49999)

600 (Serial No. above 50000)

800

50-R**

70-RT**

EM***

80-T***

FM-80**

Altec-Lansing

306-A

Bell

670

2421

2425

2441

3070

LOW LEVEL

LOW LEVEL,

LOW LEVEL

HlGH

LEVEL

HlGH

LEVEL

HlGH

LEVEL

HlGH

LEVEL

HlGH

LEVEL

4.5 HIGH

LEVEL

LOW LEVEL

HlGH

LEVEL

HlGH

LEVEL

LOW LEVEL

CONNECT TUNER

TUNER SET SEPARATION

MPX

OUTPUT

MODEL CONTROL AT: JACK MARKED

Bogen

3RB-40

SRB20

ST442

ST662

STP52

Grommes

Harman-Kardon

TA-260 (Festivalll)

TA-224(Recital)

T-230 (Sonnet)

T-220 (Aria)

ST360A (Madrigal)

FA-10 (Sonata)

F-10 (Tempo)

Citation

Ill

F500

Karg

CT-3

Mclntosh

HlGH

LEVEL

HlGH

LEVEL

HlGH

LEVEL

LOW LEVEL

HlGH

LEVEL

HlGH

LEVEL

LOW LEVEL

HlGH

LEVEL

HIGH

LEVEL

HlGH

LEVEL

HlGH

LEVEL

HlGH

LEVEL

HlGH

LEVEL

HlGH

LEVEL

HlGH

LEVEL

HlGH

LEVEL

LOW LEVEL

4.5 HIGH

LEVEL

MR-55 4

LOW LEVEL

*Requires additionalstereoamplifier.

**Multiplex output jack must be added. See page

for instructions.

***Multiplex output jack mustbeaddedto early productionmodels.

See page

for instructions.

TUNER CONNECT TUNER

SET SEPARATION MpXOUTPUT TO

MODEL 'ONTRoL

AT:

JACK MARKED

Pilot

Realistic

40-T

Scott

All

models

Sherwood

5-2000

5-2200

5-3000

5-7000

HlGH LEVEL

LOW LEVEL

4.5 HIGH LEVEL

FM MULTIPLEX

STEREO

LOW LEVEL

HlGH LEVEL

nRoADcAsrINc has a frequency range far in excess of the normal

hearing range. For example, Fisher wide-band tuners have a

frequency range which extends to

100

kc, while the normal hearing

range does not exceed 17 kc. This extra "space" in the frequency

response has now been put into service for the transmission of a

second and third signal sim~~ltaneouslywith the main carrier. The

third (and highest) signal is wed in commercial applications (for

background music) and will not be received on home high fidelity

equipment. The other two signals, however, are used for the recep-

tion of stereo programs. During multiplex broadcasts, the main car-

rier, which can be picked up by any

tuner or receiver, contains

the sum or blended signal from both stereo channels (left plus right).

The second, snpersonic signal contains the information necessary for

stereo. This system makes it possible for an ordinary FM set to re-

ceive a fully balanced monophonic program during multiplex trans-

mission. At the same time, however, the circuits of the

MPX-100

separate the two stereo channels, thus providing you with a11 the added

benefits of full stereo sound.

Because

multiplex requires new equipment and new techniques

at FM broadcasting stations, it is to be expected that not all pro-

grams will be of the same high technical calibre during the first few

months. Such occasional problems as may arise initially will no doubt

be solved quickly, as the stations gain experience with the new

procedures. It is important to keep in mind, however, that the stereo

subcarrier is inherently more noisy than the main carrier. In order

to receive weak or distant stations with acceptably low noise level%

you may find it necessary to change to an antenna with higher gain,

or to relocate your present antenna in a more favorable position.

If you have difficulty in receiving weak stations, the following

measures should be taken:

1-Reverse the antenna leads.

2-Reposition the

Antenna.

If you are using

folded dipole

antenna, rotate it horizontally about its axis to determine the orienta-

tion which produces a null or minimum received signal as indicated

on the tuning meter or tuning eye. Then rotate the antenna

degrees

for the best position. The antenna should be as high as possible, hori-

zontal and away from all large metal objects and electrical wiring. It

may also be necessary to relocate the antenna to achieve a usable signal.

Indoor antennas, especially in metal frame buildings, will give improved

results when located close to outside windows.

%Change to Rooltop Antenna.

In extreme cases, where-an indo

antenna was used for monophonic reception, il may be necessary

change to an outdoor, rooftop antenna, or even

highly direction

yagi antenna. Directional antennas should be rotated for maximu

received signal strength.

Although the problems inhemtin

multiplex have been stressed

it is not expected that they

will

arise very frequently. In general, th

can be solved simply by increasing the strength of the received sign

(and removing the distortion caused

multipath transmission)

through a change

the

antenna aptem,

GENERAL INSTALLATION

tuner

has

available

aexiliarp

pbww

auhI

mitemate

arraqm

AND OPERATION INSTRUCTIONS

-a

would

wna~

the

YPX-Im

it,

and

con-

the

smplih.)

MPX-100

operates on

only

at 105-120 volts. One three-

foot cable and two iour-foot cables are included to make con-

nections to associated equipment. Any additional connections should

be made with the same type of cable. Be sure to use the three-foot

cable for the connection from the MPX output jack on your tuner

since longer cable lengths will cause some loss of the higher fre-

quencies. Both.

MPX-100

outputs are low-impedance anode followers,

permitting cable lengths up to 10 feet between the

MPX-100

and

your amplifier. We recommend that you keep the

MPX-I00

right

beside your tuner (but away from power transformers) for ease of

operation and best performance.

NOTE:

Left (or

designation corresponds to Channel

Right (or

R) corresponds to Channel B.

ja&,

your

tuner

#=tor

obtained

Installation

of the

"Yn

eonneetor

WITH

FM-AM

STEREO TUNERS:

and

tbglbr two plw

1-Connect the FM output of the tuner to the L INPUT jack on tho:

MPX-100.

(See Figure

1.)

W'TH

MQMOPHBNJC

TUNERS?

1-'I%

taner

h4PX

autput

jack

should

connw%ad to either

the

3-The tuner MPX output jack should be connected to either the

LOW

LEVEL

HIGH

LEVEL

ja&

on the

rear

panel

the

LOW

LEVEL or

HIGH

LEVEL jack on the rear panel of the

&PX-I&.

Refer

the

tsbb

0x1

page

(or

wnmlt the

mmufaaurer

MPX-100.

Refer to the table on page

(or consult the manufacturer

your tuner)

determine

the

jack

whid

Prlrzluld

for

this

of your tuner) to determine the jack which should be used for this conatetion.

sure

the

tlirmf~fg~

cabLe

supplied

with

the

ronnection.

sure to use the three-foot

cable

supplied with the

%Connect the

Erlaia

tuner

eaiprtt

the

INPUT

jaek

the

&Connect the

(left) and R (right) outputs on the

MPX-100

IWX-ZOO.

art

additional

outpet

jack

(with

the

sams

led

outpa)

the corresponding Tuner input jacks on your stereo amplifier.

&Connect the power cable of the tuner to the auxiliary power outlet

on the rear panel of the

MPX-100,

and connect the power cable of ba~weenmonopbaic

and

sterm

the

MPX-100

to an auxiliary outlet on your stereo amplifier. (If your

3-Follow

step

and

far

FM-AM

stmw

tunem

Operation

THE

FISHER

POWER

eo,

STEREO

BEACON

UNIVERSAL

MULTIPLEX ADAPTOR

MODEL

MPX-100

STEREO-MONO

AUTOMATIC

TUNER

STEREO

OFo

*co

FF.O

UAL

NOISE

FILTER

SELECTOR

Figure

Front

panel

the

MPX-100

INDICATOR LIGHTS:

The red Power jewel on the front panel glows

when power to the

MPX-100

is turned on. The green Stereo Beacon

automatically signals whenever the station tuned to is broadcasting an

FM stereo program. It will remain off during monophonic programs.

SELECTOR SWITCH:

The Selector switch has four positions:

Off:

Power to the

MPX-100

is turned off, but feedthrough connec-

tions are provided from the tuner to the amplifier for monophonic FM,

AM or stereo FM-AM programs. You will find this position particularly

useful when listening to such programs for prolonged periods of time.

When switching from AC OFF to another position of the Selector

switch, it should be kept in mind that there will be a delay of approxi-

mately

seconds, due to necessary tube warmup, before the

MPX-100

will begin to operate.

Tuner:

In addition to providing the same feedthrough connections

from the tuner

the amplifier, this position places the Stereo Beacon

in operation. In the same manner as the

OFF position, the tuner

signal passes directly through the

MPX-100,

completely unaffected by

the adaptor's internal circuitry. FM-AM stereo and FM or AM mono-

phonic programs may be heard directly from the tuner with the

Selector in this position. Whenever a multiplex FM stereo program is

broadcast, the Stereo Beacon will automatically light. However, FM

multiplex programs cannot be received stereophonically in the TUNER

position, nor will the Automatic Switching teature operate.

Stereo-Mono

Automatic:

This position is used for normal reception of

FM multiplex broadcasts in stereo sound, and, due to the FISHER

Automatic Switching System, may also be used for reception of

monophollic FM broadcasts. The Stereo Beacon will light whenever

a multiplex program comes on the air, and the

MPX-100

will automati-

cally switch into the stereo mode. When the station reverts to mono-

phonic operation, the

MPX-10

will automatically switch to the mono-

phonic mode and the monophonic signal will appear at both outputs

of the adaptor. At the same time, the Stereo Beacon will be turned

off. This feature makes manual switching completely unnecessary

when an FM station alternates between monophonic and stereo selec-

lions. The mode selector of your amplifier should he left in the Stereo

position for

both

types of broadcast. If you live in a fringe area and

experience difficulty in receiving a particular program stereophoni-

c-ally, due

the high noise level, you may receive the program mono-

~jhonicallyby switching to TUNER or AC OFF. Since monophonic

reception is inherently less affected by background noise, the program

may be more enjoyable when this is done.

Stereo Manual:

This position should be used only during an FM

multiplex broadcast, when you wish to disable the Automalic Switching

System of the

MPX-100.

Although the Stereo Beacon will operate as

normally, the adaptor will

not

switch to the monophonic mode when

a monophonic program is broadcast. Under extremely rare circum-

stances, the background noise may interfere with normal operation of

the Automatic Switching circuits of the

MPX-100

(with the Selector

at STEREO-MONO AUTOMATIC). In this case, you can receive the

program stereophonically by turning the Selector to STEREO MAN-

UAL, or monophonically by turning to TUNER or AC OFF.

NOISE FILTER SWITCH:

The three positions of this switch perform

the following functions:

Off:

This position is used for normal reception of both monophonic

und multiplex stereo FM programs.

This position should be used only on multiplex programs, when the

noise level is'higher than normal. Since this filter cancels noise only

in the stereo subcarrier (which is inherently noisier than the main

carrier), you will hear no difference in the frequency range of the

music, although stereo separation at the higher frequencies will be

lomewhat diminished.

This filter, which provides a steep roll-off above

kc, operates in

the

name manner as the High

Scratch filter on your amplifier. To

nuppress noise on a muliplex program, try position

first. If more

noise suppression is desired, turn the Selector to position

Thisfilter is

also quite effective in eliminating noise on monophonic FM programs,

the Selector is in the STEREO-MONO AUTOMATIC position.

LEVEL SETS:

Two level sets are located on the rear panel for adjust-

ment of the sound level on both channels of the

MPX-100.

These

level sets should be adjusted so that no difference in volume is heard

when switching between

Tuner

and

Stereo.

The volume level on

the feedthrough positions

(AC

and

Tuner)

is not affected by the

level sets.

INSTRUCTIONS FOR OWNERS OF FISHER

TUNERS

AND

RECEIVERS

NOTE:

Left (oiL) designation corresponds to Channel

Right (or

R) corresponds to Channel B.

FM-40, FM-50, FM-90(X), 90-R, FM-100, FM-200, 202-R, 100-R:

Follow the appropriate instructions given in the preceding section.

Both MAIN and REC outputs should be connected to the

MPX-100.

600

and

800

1-Connect the MPX output of the receiver to the LOW LEVEL

jack of the

MPX-100.

Use the %foot cable supplied.

2-Connect the

and R OUTPUTS of the adaptor to the MPX Chan-

nel A and Channel

inputs of the

600

800.

%Turn both level sets on the receiver marked MPX A and MPX

to the maximum clockwise position.

&-To listen to FM, AM and FM-AM, operate as usual. To listen

to MPX stereo: Turn the Selector switch to FM-MPX position;

Mono-Stereo switch to STEREO, and

MPX-100

Selector switch to

STEREO-MONO AUTOMATIC.

500-S

1-Connect the MPX output on the receiver to the LOW LEVEL

jack of the

MPX-100.

Use the %foot cable supplied.

2-Connect the

and

outputs of the

MPX-100

to the MPX Chan-

nel

and Channel

inputs of the

500-S.

&To listen to FM, AM or FM-AM, operate as usual. To listen to

MPX stereo: Turn the

500-S

Selector switch to MPX and the Selec-

tor switch on the

MPX-100

to STEREO-MONO AUTOMATIC. This

arrangement will also permit reception of monophonic FM.

100-T

1-Connect the MPX output on the tuner to the LOW LEVEL

jack of the

MPX-100.

Use the 3-foot cable supplied.

2-Connect the

and

OUTPUTS to the Channel

and

AUX

inputs of the

100-T.

&Tune as no~malto the FM station desired (Selector switch in

FM position) and then switch to AUX STEREO to listen to multi-

plex stereo or monophonic FM programs

through

the

MPX-100.

Monophonic FM programs may be heard

directly

by switching to the

FM position on the

ZOO-T.

202-1

1-Connect the MPX output on the tuner to the LOW LEVEL

jack of the

MPX-100.

Use the %foot cable supplied.

2-Connect the L and R outputs to the Channel A and

AUX

inputs of the

202-T.

&To listen to multiplex stereo, tune as normal to the desired station

(Selector in TUNER position)

;

then turn the Selector to AUX and

the Mono-Stereo switch to STEREO. For monophonic FM broadcasts,

operate as usual.

101

-R

1-If you do not wish to listen to FM-AM

stereo

broadcasts, connect

both MON outputs on the

101-R

to the L and R inputs on the

MPX-100,

and the MPX output to the jack on the adaptor marked

LOW LEVEL. Then connect the L and R OUTPUT jacks of the

MPX-100

to the corresponding Tuner inputs on your amplifier.

2-If FM-AM stereo programs are broadcast in your area, connect

the STEREO FM output on the

101-R

to the L input on the adaptor,

the STEREO AM output to the adaptor

input and the MPX output

on the

101-R

to the adaptor jack marked LOW LEVEL. Then

connect the

and

OUTPUT jacks of the

MPX-100

to the corre-

sponding Tuner inputs on your amplifier.

&The first installation method enables you to choose FM, AM or

FM stereo multiplex. The Mode Selector on your amplifier should

be left in the Stereo position for all three types of broadcast. The

Selector on the

MPX-100

should be in the STEREO-MONO AUTO-

MATIC position for multiplex programs.

4-The second installation method permits reception of FM, AM,

FM-AM stereo and FM multiplex stereo. For FM reception: turn

the amplifier Mode Selector to Channel

the

MPX-100

Selector to

TUNER and the tuner Selector to FM-AM. For AM reception: turn

the amplifier Mode Selector to Channel

the

MPX-100

Selector to

TUNER and the tuner Selector to FM-AM. Use the same settings for

FM-AM stereo, with one exception: the amplifier Mode Selector should

be in the STEREO positio;l. For FM multiplex stereo, turn the

MPX-100

Selector to STEREO-MONO AUTOMATIC.

90-T

1-Connect the MPX output of the

90-T

to the LOW LEVEL

jack on the adaptor. Then connect the RCRDR output of the tuner

to the L input of the

MPX-100.

!&Connect the L and

outputs of the

MPX-100

to the correspond-

ing amplifier inputs marked TUNER.

3-Monophonic FM or stereo multiplex FM can both be received by

leaving the

MPX-100

Selector in the STEREO-MONO AUTOMATlC

position and the amplifier Mode Selector in

the

STEREO position.

For AM reception, turn the amplifier Mode Selector to Channel A.

50-R, 70-RT, 80-R,

80-1,

FM-80

Although Models FM-80, 50-R and 70-RT, and early production

models of the 80-R and 80-T are not

equipped

with

multiplex output

jacks, these tuners can easily

adapted

for multiplex by adding a

standard RETMA phono jack to

the

chassie close to the 6AL5 tube

socket. This jack is conneoted through

.01

mfd,

250V capacitor to

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