DRAKE R-4A Spécifications télécharger pdf (Page 7)

II INSTALLATION INSTRUCTIONS

UNPACKING

Carefully remove your R-4A from the packing carton and examine it closely

for signs of shipping damage. Should any be apparent, notify the delivering

carrier immediately, stating the full extent of the damage.

Fill out and mail the enclosed warranty registration card so that your

warranty will be effective.

Save the packing material.

You may need it later for reshipment or storage.

Inspect the packing material closely before putting it away to be sure that

you have not overlooked any accessory hardware.

LOCATION

In general the location of the R-4A is not critical. However, care should be

taken to insure that space is allowed around the unit for adequate air

circulation. Extremely hot locations,

such as near radiators or heating

units,should be avoided.

Do not cover the top of the R-4A with books,

papers,

or pieces of equipment,as overheating may result.

POWER REQUIREMENTS

The R-4A is supplied with a dual-primary power transformer and can be

operated from 120 or 240 volt

50/60

cycle AC. As supplied from the factory,

it is wired for 120 volt operation.

If 240 volt operation is desired, it will

be necessary to remove the black/yellow and black/green power transformer

primary wires from the terminals to which they are now connected and

connect them together at the unused terminal on the same terminal strip.

It will also be necessary to replace the

75 amp fuse supplied with the

unit with a

amp Slo-Blo fuse for adequate protection at the increased

voltage (see schematic diagram).

ANTENNA REQUIREMENTS

The R-4A is designed to give best results when used with an antenna resonant

on the operating frequency and having an impedance from 50 to 75 ohms.

This requirement is most easily met using a center-fed dipole antenna cut

to the desired frequency and fed with

RG58A/U

cable. However, there are

many other antennas which will fulfill this requirement. For a more detailed

de scription on antennas ,

we suggest you refer to the ARRL Antenna Book or

The Radio Amateur’s Handbook.

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DRAKE R-4A Spécifications Page 7

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