DRAKE R-4A Spécifications télécharger pdf (Page 6)

I GENERAL DESCRIPTION

The DRAKE R-4A is an extremely versatile communication receiver de-

signed to bring you every feature desirable for the ultimate in the

reception of all modes of amateur communications.

It provides a linear permeability-tuned solid state VFO with 1 KC

readability, and premixed injection with crystal controlled high frequency

oscillator for stability on all bands.

A 100 KC crystal calibrator is built-in.

An improved

passband

tuner/filter with four selectivity positions, and

a built-in notch filter are incorporated to provide the desired selectivity

and interference rejection,

and a noise blanker is built-in for elimination

of most noise on CW, SSB and AM.

As supplied, the unit gives complete coverage of 80, 40,

20, and 15

meter bands as well as the 28.5 MC to 29 .O MC portion of 10 meters.

Ten accessory crystal sockets are provided for coverage of other 500

KC frequency ranges between 1.5 and 30 MC such as 160 Meters, MARS

frequencies,WWV, short wave broadcast, etc. These sockets can be

programed to give up to 5 MC of continuous coverage for convenient use

with V. H. F. converters.

The R-4A also includes time proven DRAKE AVC with

fast-attack/slow-

release for SSB or AM and fast-attach fast-release for CW. If desired,

the AVC can be completely disabled for CW reception.

Complete AVC action and accurate S-meter indication can be obtained,

on all modes.

A crystal-lattice filter following the first mixer provides

excellent overload characteristics by providing selectivity before gain

producing stages.

When used with our T-4 Reciter, transceive operation may be obtained,

and when used with the T-4X transmitter, either transceive or independent

receive and transmit functions are possible.

-5-

1 2 3 4 5 6 7 8 9 10 11 ... 38 39

Pas de commentaire

DRAKE R-4A Spécifications Page 6