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
CHAPTER IIIOPERATION3-1. GENERAL.Figure 3-l illustrates and describes the front panelcontrols. Refer to the text in this chapter for de-tailed operati
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
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
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
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
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,
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
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
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
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-
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
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
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
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
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
CHAPTER IINTRODUCTION1.1. GENERAL DESCRIPTION.The R-4C Receiver is a triple conversion super-heterodyne receiver designed for optimum recep-tion of al
SPECIFICATIONSFrequency Coverage :Accessory Coverage:Modes of Operation: SSB, CW, AM, RTTY.Sensitivity: SSB Mode: 10 dB signal-plus-noise to noise rat
CHAPTER IIINSTALLATION2-1. UNPACKING.Carefully remove the receiver from the shippingcarton and examine it for evidence of damage. Ifany damage is disc
2-6. MUTE.2-11. SPEAKER.The MUTE jack provides connections for externalstandby-receive switching. The external circuit mustisolate the MUTE jack cente
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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