Drake R-4A Receiver
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R-4A
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Communication Receiver

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The Drake R-4A is an extremely versatile communication Receiver designed 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 programmed 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.

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Service- und Bedienungsanleitung
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Service- und Bedienungsanleitung
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39
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2.66 Mbytes (2790212 Bytes)
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english
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Gescanntes Dokument, alles ist lesbar.
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2017 08 09
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9f3b7d48b8915eba0f77a00eef5ab9cc
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707

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General Specifications 3 I General Description 5 II Installation Instructions 6 A. Unpacking 6 B. Location 6 C. Power Requirements 6 D. Antenna Requirements 6 E. Speaker Requirements 7 F . Anti-VOX 7 G. Muting 7 III Control Functions 9 A. Front 9 B. Rear Jacks 11 c . Side Controls & Jacks 12 IV Operation 13 A. Preliminary Control Settings 13 B. Single Sideband or Double Sideband Suppressed Carrier Reception 13 C. C. W. Reception 13 D. AM Reception 14 E. RTTY Reception 14 F. Adjusting Dial Calibration 15 G. Noise Blanker Operation 15 H. Operation of Notch Control 16 I. Accessory Frequency Coverage 17 J. Fixed Frequency Operation 20 V Theory of Operation 21 A* R. F. Amplifier 21 B. First Mixer and Premixer System 21 c . Second Converter 22 D 50 KC I. F. System 22 E. Detector Systems 22 F. Audio Output 24 G. A VC System 24 H. S Meter 24 I. Noise Blanker 25 J. Crystal Calibrator 25 K. Power Supply 25 A. Removing Top Cover 27 B. Removing Bottom Cover 27 C. Tube Replacement 27 D. Troubleshooting 27 VII Alignment Instructions 32 A. 50KC Oscillator Alignment 32 B. 50KC I. F. Alignment 32 c . Crystal Filter and Filter Match Transformer Alignment 33 D. 5595 KC Oscillator Alignment 33 E. Antenna RF, and Injection Circuit Alignment 34 F. 100 KC Calibrator Alignment 35 G. V.F.O. Adjustment 35 H. Notch Filter Alignment 35 I. Passband Tuner Alignment 35 J. Bias and S-meter adjustment 36

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