Arcam Alpha 8 Посібник - Сторінка 3

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Section B

Setting up the aerials

Your new Arcam Tuner is capable of superb reception...

but only if it is receiving a good quality transmission signal.

As the signal is so important for good reception we have created a

quick reference guide to setting up the aerials.

You are recommended to fit an FM and an AM Aerial.

FM AERIAL

Reguired to receive VHF radio signals.

FOR BEST FM RADIO RECEPTION

A roof mounted aerial is essential. For your own safety it is

recommend that a rooftop aerial is fitted by an experienced

contractor You can find these in your local telephone directory or

Yellow Pages. Your contractor will tune and direct the aerial to your

nearest FM transmitter In blocks of flats, an aerial system may

already be installed and connected to wall mounted sockets

marked FM or VHF (not TV).

Alternatively, you may decide to install an aerial yourself, Use one

designed for 'Band 2' (VHF/FM) reception. These are available from

electrical accessories shops (e.g, TANDY). This should be put

outside the building, mounted as high up as possible. Aerials can be

fitted in lofts, but meta! foil cladding used for heat insulation may

make this option useless.

As a rough guide use the following table to indicate the type of

aerial you may require.

Up to 40 miles (65 km) from a transmitter

3 element aerial

Over 60 miles (100 km) from a transmitter

6 or 8 element aerial

See 'Radio Transmitting Stations', mentioned later, for details of how

to find the location of your nearest transmission station.

Alternatively a circular 'Omni-directional' aerial can be used, though

this will not usually provide as much signal as the multi-element

types of aerial mentioned above.

The coaxial cable from the aerial should be fitted with a coaxial

plug and used with the adaptor provided. Plug it into the socket

14) in the back of your Arcam Alpha 7/8 tuner.

FOR GOOD FM RADIO RECEPTION

If you will be using your tuner within a few miles of a major radio

transmitter the T shaped wire aerial (dipole design) supplied should

give a good reception. Use the aerial and the coaxial plug adaptor

provided, to connect it to the socket ©. Mount the aerial as high

as possible on a wall. Try each usable wall of the room to see

which position gives best reception. The usual configuration is to

use the aerial in a T shape, with the two ends (elements) forming

the top cros-spiece. Use tacks or tape to hold the aerial in a T

shape. The tacks should not come into contact with the internal

aerial wire.

VERTICALLY POLARISED SIGNALS

Some signals from radio transmitter are 'vertically polarised', (see

'Radio Transmitting Stations' mentioned later, for details) in which

case the aerial needs to be located with its elements vertical.

Most, but not all signals have a 'horizontal component, if all the

stations you wish to receive have this, then aligning the aerial

elements horizontally may help to avoid interference. It is best to

try several positions.

AM AERIAL

Required for Medium Wave (MW) and Long Wave (LW) radio

radio signals.

There is an AM loop aerial supplied. Connect one end of the loop

aerial into socket G and the other end into

It does not

matter which of the wires go to which socket. Rotate the aerial to

see which position gives the best reception. Some interference of

the signal may be experienced near a fluorescent light tube or a

television. Each transmitting radio station may require the aertal to

be adjusted slightly. Even on the same frequency, the best aerial

orientation can vary with time.

In areas of weak reception or when the tuner is used inside a steel

framed building (such as a block of flats) you can use a long wire

approximately 3-5 metres long and mounted high up outside the

building. Connect the end of the wire to A as well as the loop

aerial supplied. Bo not disconnect the loop aerial.

Radio signals are not transmitted in LW in the USA , Canada and

some European countries.

FOR MORE INFORMATION

The BBC publishes a booklet entitled 'Radio Transmitting Stations'

which contains details of all BBC transmitters in the UK together

with other useful hints and tips. This booklet can be obtained on

request by sending a large stamped addressed envelope to:-

Engineers Dept.

BBC Radio

201 Wood Lane

London WI2 7TS

Telephone: 08700 100 123

Internet: http://www.bbc.co.uk/enginfo/fm_recep

The UK Radio Authority publishes The Radio Authority

Pocket Book' which contains details of all independent radio

stations. This booklet can be obtained on request by sending a

large stamped addressed envelope to:-

Holbrook House,

[4 Great Queen Street,

Holborn,

London,

WC2B 5DG

Telephone: 0171 430 2724

Fax: 0171 405 7062

e-mail: [email protected]

Internet: http://www.radioauthority.org.uk

A free booklet (number 004-000-00345-4) is available from the

U.S. government called 'How to Identify and Resolve Radio-

TV Interference Problems' by writing to:

The U.S. Government Printing Office

Washington, D.C.

20402.