Tandberg TR-2075 User Manual
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Contents:
Power ON/OFF switch .................................................................................................. Page 3
Extra power sockets ........................................................................................................ Page 3
Light dim........................................................................................................................... Page 3
FM Antennas..................................................................................................................... Page 4
Tuning on FM.................................................................................................................... Page 6
AM Antennas..................................................................................................................... Page 8
Grounding ....................................................................................................................... Page 8
Tuning on AM................................................................................................................... Page 9
Volume - Balance .......................................................................................................... Page 9
Tone Controls.................................................................................................................... Page 9
Stereo - mono switching..................................................................................................... Page 10
Use of PRE AMP OUT and MAIN AMP IN sockets.......................................................... Page 10
Filters................................................................................................................................ Page 11
Headphones ...................................................................................................................... Page 12
Loudspeakers .................................................................................................................. Page 13
Room acoustics ............................................................................................................... Page 14
Stereo tips ....................................................................................................................... Page 14
Speaker selector .............................................................................................................. Page 15
Output power indicator ................................................................................................... Page 15
Listening to records............................................................................................................ Page 16
Playback from tape recorders (TAPE 1 and TAPE 2) ....................................................... Page 17
Recording from the receiver................................................................................................ Page 18
Recording from a transcription unit..................................................................................... Page 19
Copying tape ................................................................................................................... Page 20
Recording on a third tape recorder with or without audio controls...................................... Page 21
Monitoring during recording ........................................................................................... Page 22
4 Channel use ................................................................................................................. Page 22
Simultaneous recording of a radio/transcription program and playback of
another program from tape............................................................................................ Page 23
Plugs.................................................................................................................................. Page 24
Useful data......................................................................................................................... Page 24
3
Power ON/OFF switch
Make sure that the receiver is marked with the correct
a.c. voltage for your supply.
Switch the receiver on by depressing the ON/OFF-button.
Another push on the button will release it and switch the
receiver off. This button also controls the power to one of the
extra power socket, marked SWITCHED, at the hack of the
receiver (more details below).
NOTE!
When switching on you will notice that nothing happens until
about 3 seconds after you have pushed the ON/OFF button.
Then you will hear a click from inside the cabinet and the
receiver becomes live smoothly without audible switching
transients in the speakers.
Extra power sockets
Three extra power sockets are provided at the back of this
receiver. These extra sockets are intended for other Hi-Fi units
and reduce the number of untidy power cables.
Two of the sockets by-pass the ON/OFF-buturn
and are live as soon as the receiver power plug is live. These
sockets are marked UNSWITCHED and the total combined
power drawn from them must not exceed 200 W. These
sockets are useful for connecting Hi-Fi units having their own
power ON/OFF switches.
The third extra power socket is marked SWITCHED and is
controlled by the ON/OFF switch on the receiver. This socket
is suitable for a Hi-Fi unit that does not have its own ON/OFF
power switch and the total power drawn from it must not
exceed 100 W.
Check the power consumption of the units you connect
to these extra sockets to ensure that it falls within the
permissible total rating.
NOTE! When using a switched wall socket remember to
release the ON/OFF-button on the receiver before breaking the
power with the switched wall socket. Otherwise you will hear
a loud click in the speakers when switching on.
Light dim
If the scale and meter lights are too bright, depress the
LIGHT DIM button on the extreme right side of the receiver.
Another push on this button will restore the lights to full
brightness.
3
4
FM Antennas
What type of antenna do you need?
Your need for a good antenna will depend on the receiving
conditions where you live; the further you are away from the
transmitter and the more obstacles (hills and tall buildings for
example) between you and the transmitter, the greater will he
your need for a good antenna. Remember that it is not good
enough just to receive a signal, especially if you are a serious
stereo listener. You need to receive a signal that is much
stronger than any unwanted electrical noise that might be
lurking around in your area. Furthermore, FM signals bounce
off large obstacles and cause you to receive the same program
from several directions at the same time, possibly out of
phase with one another. This gives distortion which you do
not want. Instead you need one strong, clear signal straight
from the transmitter and this may call for an elaborate,
directional antenna.
If in doubt you can consult your dealer who will probably be
more familiar with local receiving conditions than most
people. In any event you should install an antenna that is
better than the one that you think you can just manage with,
because under doubtful conditions a good antenna is just as
important as good loudspeakers.
Whether you need a simple antenna such as a folded dipole or
an elaborate multi-element array, the following tips will be
useful.
Antenna connections
This receiver is equipped with a balanced antenna input and
an unbalanced antenna input.
The 300 ohm balanced input terminals (socket on European
version) are intended for connection to a 300 ohm antenna via
a flat twin-lead balanced feeder having the same impedance.
The 75 ohm unbalanced input terminals (socket on European
version) are intended for connection to an antenna via a 75
ohm coaxial cable. The center conductor of the cable should
be connected to the terminal marked 75 ohms and the shield
should be connected to the chassis terminal just below.
If you have the European version you should fit the
appropriate plug.
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A simple folded dipole antenna
A simple folded dipole for connection to the balanced input
can be easily made from flat twin-lead with an impedance of
240 to 300 ohms, A 135 cm (53") piece of antenna lead
should be used for the loop. Strip off approximately 1 cm
(1/2'') of insulation at each end and solder as shown. Cut one
of the wires in the middle of the loop and connect another
twin-lead to act as feeder to the input. Solder as shown.
This antenna can be used indoors or outdoors. When used
outdoors the solder joints should be protected against the
weather and the loop can be fixed to a flat wooden board.
When used indoors the loop can be fixed to any convenient
non-metalic structure or a flat wooden board. The important
requirement in all cases is that the loop should be firmly
fixed, horizontal, and straight.
To obtain good reception the loop should be approximately
at right angles to the transmitter (see diagram) although the
best orientation may have to be found experimentally.
Typical multi-element antenna
The diagram shows a typical multi-element antenna for use
where receiving conditions are doubtful. This type of
antenna will provide typi-cally 6 dB more gain compared
with a folded dipole (the antenna signal fed to the receiver
is doubled).
Many types of multi-element arrays are available and some
can even be rotated every time you tune in to a different
station. Your dealer will advise you or you can buy
specialist literature and become an expert yourself.
6
Tuning on FM
Select FM reception by depressing the FM button.
The red light over the button will light telling you that
the receiver is in the FM mode.
Use the large knob on the right side of the scale to
tune in the required station.
NOTE! Make sure that the PREAMP REC
button is released.
Correct tuning is important, particularly for stereo, if
distortion is to be avoided. This receiver is there-fore
equipped with two tuning meters, one indicating signal
strength (SIGNAL) and the other indicating midscale
for exact tuning (TUNING). First adjust the tuning
knob for maximum deflection on the SIGNAL meter
and then make a final fine adjustment to obtain
midscale deflection on the TUNING meter.
The frequency calibration of the scale is accurate to
within ± 200 kHz. So do not be confused if a station
transmitting on, for instance, 103.9 MHz tunes in at
104.1 MHz on the scale. This is still within the
tolerance. The scale is simply a guide and what really
matters is that you use the two tuning meters correctly.
Muting
The high amplification necessary to obtain good
sensitivity and limiting in high class tuners, makes
tuning noisy. To avoid this, a muting circuit blocks the
receiver automatically when no signal is received or if
the signal is to weak to give satisfactory noise
suppression. To receive a station that is not strong
enough to cancel the blocking effect of the muting
circuit, the circuit can be switched off.
The muting function is activated by depressing the FM
muting knob on the extreme right side of the front
panel. Another push on the button will release it and
cancel the muting.
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Stereo/mono
This receiver is fully equipped for the reception of FM
stereo broadcasts.
FM stereo broadcasting is based on the pilot tone system
which allows the program to be received in mono on mono
receivers without impairment of program quality. It is an
inherent property of this system that a stronger signal is
needed in stereo to obtain the same noise suppression as in
mono. The FM stereo decoder automatically switches to
stereo operation when a stereo signal of sufficient strength is
received. If the stereo signal falls below a preset threshold,
the program will be automatically reproduced in mono.
However, it is possible for the strength of a stereo signal to
be adequate and yet for the signal to be temporarily disturbed
by noise or distortion. In this event depress the FM MONO
button whereby the program will be reproduced in mono
without noise or distortion.
Because stereo reception requires a strong antenna signal and
is sensitive to multi-path distortion, a good antenna is needed
particularly under difficult receiving conditions and in fringe
areas. Read the preceding section on FM antennas.
Dolby* programs from FM stations
The Dolby B noise reduction system offers a possibility to
combat the higher noise in FM stereo transmissions. The
system is in the USA approved by FCC** for FM
broadcasting.
The Dolby B system use a program level dependent
preemphasis. At high level the preemphasis is 25 μsec, at
lower level the preemphasis increases. The utilization of the
allowed modulation can thereby be improved. The
compatibility of the Dolby B system with existing standards
is considered acceptable as the average preemphasis obtained
in the Dolby B encoder matches the standard deemphasis. To
take full advantage of the Dolby B noise reduction, a Dolby
B decoder unit must be used and the deemphasis network in
the receiver must be corrected to 25 μsec.
For those who may receive Dolby B encoded FM broadcasts
we have found a switchable deemphasis to be a useful
feature, This serves two purposes. First: To enable the user
to utilize a separate Dolby decoder, for instance the decoder
already incorporated in Tandberg Tape Recorders 3600XD,
9200X.D and 10XD. Second; To enable a direct re-cording
of the Dolby B encoded program for later decoding when
played back through the tape recorder's Dolby circuits.
PROCEDURE:
When receiving an FM Dolby transmission and using a
Dolby B decoder, the FM 25 uS button must be
depressed. The button must also be
depressed when a direct recording of a Dolby B transmission
is wanted ***.
When receiving an FM Dolby transmission without using a
Dolby B decoder, the FM 25 μS button must be released.
* The name Dolby is a registered trade mark of Dolby
Laboratories Inc.
** FCC stands for Federal Communications Commission, the USA
broadcasting standards organization.
***If you are using a Tandberg Tape Recorder with Dolby, set the
Dolby knob of the recorder to DOLBY FM.
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AM Antennas
Ferrite-rod
For operation in the broadcast band this receiver is equipped
with a moveable ferrite-rod antenna. This antenna is intended
for local reception where the signal strength is normally fairly
high, but it can under favorable receiving conditions also pick
up more remote stations efficiently. The ferrite-rod antenna is
highly directional and picks up the strongest signal when it is
at right angles to the transmitter. The antenna is hinged and
should be rotated to the position giving the best reception.
This is also possible when the receiver is placed on a shelf.
The ferrite-rod antenna can never perfectly replace a good
outdoor antenna.
NOTE! The antenna circuit is built into the ferrite-rod casing.
When listening to AM you should always move the ferriterod away from the rear panel to avoid de-tuning of the
antenna circuit. This is also important when using an
outdoor antenna.
Outdoor antenna
To give the best results an outdoor antenna should be used.
Suspend a wire 15 to 20 meters (50 to 60 feet) long at the
highest possible elevation. The best results may he obtained
by experimentation.
Connect a feeder to the terminal marked AM ANT (socket on
European version) and if the feeder is long avoid running it
too close to walls.
If you have the European version connect the
appropriate plug.
Grounding
To obtain best AM reception grounding of the receiver is
recommended. Connect the AM ground terminal (A) to the
nearest water pipe.
The grounding terminal B is designed for FM
coaxial antenna cable (U.S. model only).
The grounding terminal C is prepared for grounding of
transcription unit or record player chassises when phono
connectors are used.
Wiring of the DIN connector for phono use is shown on
the back cover.
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