DRAKE R-4C Specifikace

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Strany 2 - TABLE OF CONTENTS

Table 2- 1. Crystal FrequencyChartFREQUENCY FREQUENCYRANGE CRYSTAL BAND RANGE CRYSTAL BAND2.01.5 - 222-c 12.6 1.5 --3.0 16.5--1 17.0 27.6 21.02

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CHAPTER IIIOPERATION3-1. GENERAL.Figure 3-l illustrates and describes the front panelcontrols. Refer to the text in this chapter for de-tailed operati

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FRONT PANEL CONTROLS1. S Meter: Indicates relative signal strength.Calibrated in S units from 1 to 9. Above 9 thescale is calibrated in decibels.2. FU

Strany 5 - INTRODUCTION

stationary and rotate the knob skirt until thedial displays the correct frequency.3-6. XTALS.In the NORM setting of this 16 position switch, theproper

Strany 6 - SPECIFICATIONS

audio voltage applied to the audio amplifier stages.The outer control which is adjusted with the leveris the RF Gain control. This control increases t

Strany 7 - INSTALLATION

f. Set AF GAIN knob to a comfortable level.g. Set PRESELECTOR control to center of bandsegment marked on panel. After desired signal istuned in, adjus

Strany 8 - VOX circuit of the

109878543210e. Medium or Fast AGC time constant may be h. The 4-NB Noise Blanker may be used if it hasused if desired. been installed.f. Additionally,

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CHAPTER IVTHEORY OF OPERATION4-1. GENERAL.Refer to the block diagram figure 4-l and theschematic diagram figure 5-3 as required for thefollowing circu

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4-6. SECOND IF SYSTEM AND DETECTORS.The 50 kHz signal from T7C is coupled to the gridof V5 through the T-Notch filter T8 and its associ-ated circuitry

Strany 11 - OPERATION

CHAPTER VMAINTENANCE5-1. SERVICE DATA.We will check and align your receiver at the factoryfor a nominal fee if it has not been tampered with.Transport

Strany 12 - FRONT PANEL CONTROLS

TABLE OF CONTENTSCHAPTER Il-l.1-2.CHAPTER II2-l.2-2.2-3.2-4.2-5.2-6.2-7.2-8.2-9.2-10.2-11.2-12.2-13.2-14.2-15.2-16.2-17.2-18.CHAPTER III3-l.3-2.3-3.3-

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5-7. 50 kHz BFO AND IF ALIGNMENT.abcd.e.Apply signal of exactly 50.000 kHz to pin 2 ofV4 (6EJ7). (Maximum frequency error of 25 Hz.)Set PASSBAND contr

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b.C.de.f.g-h.green. Connect a 10,000 Ohm resistor from themore easily accessible of the two rotor contactson Sl D to ground. From the corresponding ro

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Table 5- 1. Resistance ChartREFMEASURED AT PINDES Type 1 2 3 4 5 6 7 8 9Vl 6BA6 4M 0 0 0.01 5.5K 9K 0 --v2 6EJ7 470 100 K 470 0.0l 0 6.5 K12K 0’v3 6BE

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TABLE OF CONTENTS (continued)3-13. S'METER . .3-14. PHONE-JACK. . . .3-15. S'METER ZERO..3-16. BASIC CONTROL SETTINGS3-17. SSB REC

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LIST OF ILLUSTRATIONSFigure1-1.2-1.2-2.2-3.3-1.3-2.3-3.3-4.4-1.5-l.5-2.5-3.R-4C RECEIVER . . . . . . . . . .VIEWING ANGLE OPTIONS. . . . . . .REAR CHA

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CHAPTER IINTRODUCTION1.1. GENERAL DESCRIPTION.The R-4C Receiver is a triple conversion super-heterodyne receiver designed for optimum recep-tion of al

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SPECIFICATIONSFrequency Coverage :Accessory Coverage:Modes of Operation: SSB, CW, AM, RTTY.Sensitivity: SSB Mode: 10 dB signal-plus-noise to noise rat

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CHAPTER IIINSTALLATION2-1. UNPACKING.Carefully remove the receiver from the shippingcarton and examine it for evidence of damage. Ifany damage is disc

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2-6. MUTE.2-11. SPEAKER.The MUTE jack provides connections for externalstandby-receive switching. The external circuit mustisolate the MUTE jack cente

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should be used for accessory coverage. Selectedcrystals for accessory coverage with the R-4C willbe supplied by the R. L. Drake Company at a nom-inal

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