DRAKE R-4A Specifications download pdf (Page 18)

I. Accessory Frequency Coverage

In addition to reception on 80, 40, 20, 15, and the 28.5

29.0 portion

of 10 meters, the R-4A can be programed to receive any ten 500 KC-wide

ranges between 1.5 and 30.0 mc (excluding 5.0 to 6 .O mc) by inserting

the appropriate crystal in one of the ten accessory crystal sockets.

These sockets face out the rear of the unit on the left side of the chassis.

In order to determine the correct crystal frequency, simply add 11.1 to the

lowest frequency of the 500 KC range to be covered. For example; assume

you wanted to receive 1.5 to 2.0 M

C for reception of the 160 meter amateur

band. The crystal frequency would be the lowest frequency of the de-

sired range (1.5 M

C) plus 11.1 which would equal 12.6 MC. This crystal

can then be inserted in any one of the ten accessory crystal sockets

provided.

IMPORTANT: Only series resonant crystals should be used. Accessory

’

crystals may be ordered direct from the R.L. DRAKE COMPANY for $5.00

)

each. When ordering,

be sure to specify that the crystals you desire are

for accessory frequency operation in the R-4A.

In order for the desired band to be received,the

XTAL

Switch must be turnea

to the number corresponding to the crystal socket in which the crystal in

question is inserted.

The lowest frequency of the range made available

may then be written in the range window with pencil for future reference.

If crystals are changed you may erase the previously inscribed numbers

easily.

The BAND switch must now be turned to a position which will allow the

PRESELECTOR to tune the desired range.

Recommended ranges are as

follows:

BAND

PRESELECTOR TUNING RANGE (MC)

1.5-3.0 1.5

3.0

3.5 3.0

5.0

7.0 6.0-10.0

14.0 10.0-16.0

21.0 16.0-23.0

28.5 23.0-30.0

In our example,the BAND switch should be placed in the 1.5 position and the

preselector should be peaked on the 160 meter portion of its scale.

A chart showing the preselector frequency vs. log scale setting for each

Band switch position is shown on page 19.

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1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 38 39

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DRAKE R-4A Specifications Page 18

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