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

GENERAL

SPECIFICATIONS

FREQUENCY COVERAGE:

3.5-4.0 MC,

7.0-7.5Mc,

14.0-14.5,

21.0-21.5,

and 28.5-29.0 MC with crystals supplied.

Ten accessory crystal sockets

are provided for coverage of any 10 additional 500 KC ranges between 1.5

and 30 M

C with the exception of 5.0-6.0 MC.

SELECTIVITY: Drake tunable

passband

filter provides:

KC at 6 DB down and 2.6 KC at 60 DB down

1.2 KC at 6 DB down and 4.8 KC at 60 DB down

2.4 KC at 6 DB down and 8.2 KC at 60 DB down

4.8 KC at 6 DB down and 20 KC at 60 DB down

Selectivity switching is independent of detector and AVC switching.

I. F . FREQUENCIES:

First I. F.

5645 KC crystal lattice filter; second I.F.

50 KC tunable L/C filter.

STABILITY: Less than 100 cycles after warm up.

Less than 100 cycles for 10%

line voltage change.

SENSITIVITY: Less than

uv for 10 DB signal plus noise to noise on all

amateur bands.

MODES OF OPERATION: SSB, CW, AM, RTTY

DIAL

CALIBRATION: Main dial calibrated

0 to 500

and500 to 1000

5 KC

divisions. Vernier dial calibrated 0

to 25 KCin

1 KC

divisions.

CALIBRATION ACCURACY: Better than 1 KC when calibrated at nearest 100

KC point.

AVC: Amplified delayed AVC having slow

sec

.) or fast

025 sec.)

discharge; less than 100 microsecond charge. AVC can also be switched

off. 3 DB change in AF output with 60 DB change in RF input.

AUDIO OUTPUT: 1.4 watts max. and .5 watts at AVC threshold.

AUDIO

OUTPUT

IMPEDANCE: 4 ohms and hi impedance for anti-vox.

ANTENNA INPUT: Nominal 52 ohms.

SPURIOUS RESPONSES: Image rejection more than 60 DB. I. F. rejection

more than 60 DB on ham ranges.

Internal spurious responses in ham ranges

less than the equivalent 1 uv signal on the antenna.

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DRAKE R-4A Spécifications Page 4

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