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How to Connect and

Back Panel Information

Refer to page 5.

AUDIO OUTPUTS

Use the FIXED OUTPUT  j a c k s on the rear panel to

feed program to a stereo control preamplifier or

other equipment which has its own volume control.

The front panel VOLUME control does not  a f f e c t the

loudness of the tuner at the FIXED OUTPUT jacks.

The output level is a nominal 1 volt for 100% FM

modulation.

Use the VARIABLE OUTPUT jacks to connect to

equipment such as a power  a m p l i f i e r or a tape

recorder where control of the volume at the tuner is

desired. The output at the  V A R I A B L E OUTPUT  j a c k s

is a nominal 2.5 volts for 100% FM modulation.

There is no difference in the signal quality at either

pair of output jacks.

Both pairs of OUTPUT  j a c k s may be used simul-

taneously. The output impedance at both outputs is
very low so that long audio cables can be used
without a loss of high frequencies due to cable
capacity.

RF INPUTS — ANTENNA CONNECTIONS

Two of four  d i f f e r e n t antenna systems can be

used with your MR 80. 1) an outdoor FM antenna, 2)

an  a l l channel (UHF-VHF-FM) antenna, 3) a cable in-

put from your local cable company, or 4) the indoor

dipole supplied  w i t h the MR 80. A switch is provided

on the top level set panel to select between two of

the four systems mentioned.

An outdoor antenna is recommended for optimum

performance in all areas. In fringe areas, best results

will be obtained with a highly directional FM an-
tenna used in connection with a rotator. Rotate the

antenna until the best reception is obtained. Con-

nect a 300 ohm outdoor antenna to the 300

W

  A N -

TENNA (red) terminals. Connect a 75 ohm antenna

and/or 75 ohm cable system to the coaxial antenna
j a c k .

A  f l e x i b l e  f o l d e d dipole antenna supplied  w i t h

your MR 80 may be used in urban or in high signal

strength areas. The  f l e x i b i l i t y of the  t h i n  f l a t wire
assembly permits it to be placed under a rug. tacked
behind the stereo or placed in any other  c o n v e n i e n t

location. In some cases it may be necessary to posi-

tion the antenna for best signal reception. This
should be done before it is permanently located.

Avoid locating  t h i s antenna next to other  w i r e s or

metal objects. This antenna may not prove  e f f e c t i v e

in houses having metal siding or metal clad insula-

tion.

The cable signal from a local cable company or a

second FM antenna with 75 ohms impedance may

be connected to the coaxial cable jack.

REMOTE SCAN

The REMOTE SCAN CONTROL SIGNAL jack is to

be connected to the cable push button assembly

supplied  w i t h the MR 80 for remote tuning. Plug the
cable into the CONTROL SIGNAL jack. Pressing the

push button at the end of the cable causes the MR

80 to scan to the next station. The mode of scan can

be selected by the STATION'S slide switch. In the

PRESET position every time the push  b u t t o n is

depressed the MR 80  w i l l scan to the next preset sta-
tion. In the ALL position depressing the  b u t t o n  w i l l
cause the MR 80 to scan to the next station.

If REMOTE tuning is not used, leave the  j a c k free

of any connection.

SCOPE

The  v e r t i c a l and horizontal scope jacks are pro-

vided to connect to a maximum performance in-
dicator or an oscilloscope for indication of FM

multipath and signal strength. Connect the  v e r t i c a l

jack to the vertical input of the indicator and the

horizontal jack to the horizontal input.

UNSWITCHED AC POWER OUTLET

This outlet may be used to power  a u x i l i a r y equip-

ment such as an antenna rotator or a maximum per-

formance indicator. Power is available whenever the

MR 80 is connected to a power source.

4

Summary of Contents for MR80

Page 1: ...Reading Time 32 Minutes Price 2 00 THE MclNTOSH MR 80 DIGITAL FM TUNER...

Page 2: ...the rear panel of the chassis Record that serial number here Serial Number The model serial number and purchase date are important to you for any future service Record the purchase date here Purchase...

Page 3: ...RACT CER TIFICATE must be presented when the instrument is taken to the service agency 3 Always have service done by a Mclntosh authorized service agency If the instrument is modified or damaged as a...

Page 4: ...tenna jack A flexible folded dipole antenna supplied with your MR 80 may be used in urban or in high signal strength areas The flexibility of the thin flat wire assembly permits it to be placed under...

Page 5: ...R 2ND 75W ANTENNA LEAD IN FM ANTENNA OPTIONAL 75W ANTENNA LEAD IN REMOTE CONTROL PUSH BUTTON POWER AMPLIFIER PREAMPLIFIER LEFT SPEAKER RIGHT SPEAKER 5 MAXIMUM PERFORMANCE INDICATOR OR OSCILLOSCOPE TO...

Page 6: ...4 These touch pads located to the left of the fre quency display select one of the four preset sta tions Just touch to operate A small rectangle will light above the pad indicating which preset has b...

Page 7: ...ono reception In the STEREO position the tuner automatically switches from mono to stereo mode when a pre determined signal to noise ratio has been reached In the MONO position all stations will be re...

Page 8: ...INPUT switch selects either an antenna or cable as the RF input source The CABLE input may also be used as a second antenna input Lock This switch will disable the lock circuits only when the main tun...

Page 9: ...on 110dB Narrow 8dB 90dB Super Narrow 60dB 110dB Tuner IM RF 23dBm for 2 signals 1MHz apart Tuner Intercept Point 10dBm 75W ImageRejection 90dB Maximum Signal Input 8 volts across 75W 1W antenna termi...

Page 10: ...Performance Charts SIGNALINPUT 10 SIGNAL INPUT...

Page 11: ...11 FREQUENCY IN HERTZ FREQUENCY IN HERTZ FREQUENCY IN HERTZ...

Page 12: ...12 FREQUENCY IN HERTZ FREQUENCY IN HERTZ FREQUENCY IN HERTZ...

Page 13: ...13 FREQUENCY IN HERTZ FREQUENCY IN HERTZ FREQUENCY IN HERTZ...

Page 14: ...on ordinary tuners Constant delay design techniques are used in the 4 pole 4 zero crystal filter used in the SUPER NAR ROW position However due to the extreme selec tivity delay distortion is very sli...

Page 15: ...is for use with an external noise reduction adapter An electronically switched filter circuit im plemented with two J FETs of a quad J FET package is used to reduce out of phase noise when in the ste...

Page 16: ...he scan circuitry on the tuning control logic board The logic circuitry will then select the auto scan circuit and start searching for the next acceptable station The direction of scan will be the las...

Page 17: ...and in hibit the lock circuit under these conditions On the top cover control panel is a manual lock ON OFF switch that inhibits the lock circuit only if the tuner is in the main tuning knob mode This...

Page 18: ...the IF offset by adding the negative of the IF frequency The gate signal is derived from a stable 200kHz crystal oscillator and a binary divider made from LS integrated circuits Two other signals are...

Page 19: ...19...

Page 20: ...Block Diagram 20 MclNTOSH MR 80...

Page 21: ...DIGITAL FM TUNER 21...

Page 22: ...MBERS ST BINGHAMTON N Y 13903 9990 607 723 3512 The continuous improvement of its products is the policy of Mclntosh Laboratory Incorporated who reserve the right to improve design and price without n...

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