FREDERICK ELECTRONICS lSOOB1500B Instruction Manual

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INSTRUCTION MA NUAL

MODEL lSOOB RECEIVER

December 1971

FREDERICK ELECTRONICS CORPORATION

Hayward Road,

Post Office Box 502

Frederick,

Maryland

Printed in U.S.A.

21701

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Page 1 INSTRUCTION MA NUAL MODEL lSOOB RECEIVER December 1971 FREDERICK ELECTRONICS CORPORATION Hayward Road, Post Office Box 502 Frederick, Maryland 21701 Printed in U.S.A.
Page 2 Original Printing - June 1970 Second Printing - April 197 1 Third Printing - June 1971...
Page 3 -FREDERICK ELECTRONICS CORPORATION HAYWARD ROAD POST OFFICE BOX 502 FREDERICK, 21701 MARYLAND • • ERRATA SHEE T Model lSOOB REFERENCE CORRECTION Figure 6-3 Added -2 and -3 configurations as shown below; CENTER BAND- FREQ. WIDTH C4 7 C48 C49 cso (Hz) (Hz) (kHz)
Page 4 FREDERICK ELECTRONICS CORPORATION HAYWARD . ROAD POST OFFICE FREDERICK, MARYLAND 21701 • • ERRATA SHEET Mode l 1500B (cont.) REFERENCE CORRECTION Figures 6-3 and 7-5 Added -4 configuration as sho�n below. CENTER BAl\lD- FREQ. WIDTH (Hz) (kHz) (kHz) (Hz) C47 .C48 "CSl C61 ·...
Page 5 FEC products subjected to improper use, tampering, negligence, or accident; Frederick Electronics Corporation d oes not authorize any person to assume for it any liability in connection with its products other than herein expressed. PROPRIETARY INFORMATION...
Page 6: Table Of Contents
CONTENTS SECTION PAGE INTRODUCTION Purpose Of Equipment Physical Description Specifications INSTALLATION Unpacking A�d Inspection Power Requirements Mounting Rear Panel Connections 2.4.1 Antenna 2. 4. 2 Speaker Headphones 2.4.3 Demodulator 2.4.4 2.4.5 Remote AGC Remote Local O scillator 2.4.6 OPERATION General Use Of Controls 3.
Page 8 CONTENTS (cont.) PAGE SECTION ALIGNMENT General Required Test Equipment 5. 3 Initial Control Settings BFO Oscillator Adjustment IF Alignment Mixer Balance Adjustment 5. 7 AM AGC Level Adjustment OSC Trim Control Adjustment Local Oscillator Adjustment SCHEMATIC DIAGRAMS ASSEMBLY DRAWINGS 7- 1 TABLES TABLE PAGE...
Page 9 LIST O F ILLUSTRATIONS FIGURE Model lSOOB Receiver 2 - 1 Rear Panel Connections Relationsh ip Of F SK And AM Reception 4 -1 Functional Block Diagram 6 - 1 Preselector, Schematic Diagram 6 - 2 Mixer And Local Oscillator, Schematic Diagram 6 - 3 IF, BFO, And Detector,...
Page 11: Introduction
SECTION I INTRODUCTION PURPOSE OF EQUIPMENT The Frederick Electronics Corporation (FEC) Model lSOOB Re ceiver provides optimum reception of FSK (Fl) and AME (A3H) signals in the range of 10 kHz to 29 MHz. The Receiver is crystal controlled and designed for use with an external FSK Demodulator such as the FEC Model 1200.
Page 12: I 1.3 Specifications
SPECIFICATIONS Specifications for the Receiver are shown in Table 1-1. Table 1-1. Specifications, Model lSOOB ANTENNA INPUT . Nominal SO ohms, unbalanced. NOISE GENERATOR . . Approximately 1 microvolt in the standard 3 kHz bandwidth over range of Receiver (injected at antenna terminal).
Page 13 Table 1-1. (cont.) RECEIVER OUTPUT ..600 ohms, variable for a nominal 0 dbm. MONITOR OUTPUTS ..ohms, watt. POWER REQUIREMENTS ..115/230 vac, 47 to 63 Hz, 20 watts...
Page 14: Installation
If any damage is found, container. file a written claim with the shipping agency. Send a copy of this claim to Frederick Electronics Corporation. POWER REQUIREMENTS The Receiver is shipped ready to operate directly on 105-130 volt, 47-63 Hz ac current.
Page 15 FUNCTION GROUND EXTERNAL AGC COMt,IQN E XTER NAL AGC SPACE INPUT EXTERNAL AGC M A RK IN P GROUND BAL ANCED GOO"' OUT TO BALA NCED GOOA OUTPUT OUTPUT DEMOOULA TOR IG.r. OUTPUT UNLISTED PINS USED SPEAKER REMOTE OSCILLATOR INPUT REMOTE OSCILLATOR OUTPUT...
Page 16: Headphones
single plug is used to interconnect the Receiver and Demodulator. Speaker voice coil impedances can be almost any standard value , although maximum efficiency will be obtained with 16-ohm imped ances. 2.4.3 HEADPHONES A headphone jack labeled MONITOR is located on the Receiver front panel.
Page 18: Operation
NOTE AGC SLOW FAST RMT switch (cont.) (FSK operation only) ..During operation the AGC switch must be placed in the RMT position without a remote signal input. OSC TRIM -/+ control ..Permits crystal frequency to be "pulled"...
Page 19: Use Of Controls
S-UNITS meter . Indicates accuracy of tuning and relative strength of received signals. Meter is calibrated in S-units from 1 to 9, and in de cibels above S9 db). Noise pushbutton switch Activates noise generator and (below S-UNIT meter) allows Receiver to be peaked for optimum reception.
Page 20: Noise Switch
The S meter is calibrated in S-units from to 9, and in decibels above S9 to +90 db. Readings on the S-meter will be correct only when the RF GAIN control is at maximum sensitivity (fully clockwise). 3.2.4 NOISE SWITCH The noise pushbutton switch (located below the S-meter) ac...
Page 21 show the relationship of the received signal to the loca l oscil lator frequency. In the FSK mode (SSB), the crystal frequency is 9 MHz above the carrier frequency on bands A, B, C, and L and 9 MHz below the carrier on bands D and E. In the mode the crystal frequency is 9001.4 kHz above the carrier on bands A, B, C, and L and 8998.6 kHz below the...
Page 22 FSK(Fl) AM(A3H) Filter Filter Center Center Carrier Sp 300 Hz 3000 Hz arr1er NOTES The Fl Filter Center frequency is the same as the "assigned" center frequency. The A3H center frequency is 1.4 kHz above the carrier frequency. For Fl reception: Local oscillator crystal Carrier Frequency ±9 MHz.
Page 23 ..-. - ..�--- .. .-. - ---- - - ------- -- - - ..._...... . � Table 3-3. INTERNAL SPURIOUS FREQUENCIES S + N CARRIER LEVEL (uV) FOR lOdb *LOCAL LOWEST ORDER...
Page 24 crystal is trimmed individually when it is initially installed and the OSC TRIM control is centered for this adjustment.) In general, the amount of variation possible is proportional to the frequency of the crystal selected. Normally, the Receiver is tuned with the OSC TRIM control set to its center position (indicated by a ver...
Page 25 output. M aximum output is obtained with the control rotated fully clockwise. 3.2.11 MONITOR LEVEL The MONITOR LEVEL control adjusts the level of the audio amplifier feeding the headphone jack and external speaker termi nals. Maximum output is obtained with the control rotated fully clockwise.
Page 26 NOTE Avoid peaking Receiver at an image fre quency by making sure that the MHz con trol is set to the scale reading corre sponding to the desired frequency. Al though it will be necessary to rock the MHz control back and forth around the indicated frequency, the final scale setting will always be fairly close to...
Page 27 SECTION IV THEORY OF OPERATION FUNCTIONAL DESCRIPTION A functional block diagram of the Model 150 0 B Receiver is shown in Figure 4-1. Frequency shift keying (FSK) or AM signals in the range of 10kHz to 550kHz and 1.7 MHz to MHz are routed from the antenna to the appropriate section of a 6-band preselector.
Page 28 ...-. . r-------- - - ----------- - ---------------- -OISAkE o- -ENAI!lf OS C. TRIM (u D"M) ANTENNA b0UJ1 REMOTE OSCILLAlOR OUTPUT �KHz LEVEL CRYSTAL HI'H � 8AN0 � FILTER , ..2.5 tc:H� AUDIO PRESELECTOR ..-'MPLIFIER NOTE AUOIO 3.o k.H..
Page 29 The external circuits used to derive the AGC control voltage are designed for operation with an FSK Demodulator such as the Frederick Electronics Model 1200. Mating of the Receiver and the Model 1200 produces an ideal environment for the Detectors and patented Decision Threshold Computer (DTC) in the FSK Demodulator.
Page 30 remainin g operation is identical to that of the internal AGC circuit. The AGC switch on the Receiver has positions designated SLOW, FAST, and RMT. The first two positions are used with the internal AGC circuit and function as follows: SLOW AGC provides a fast attack and a slow release.
Page 31 The wave trap consists of a 9 MHz series-resonant crystal (Yl) located at the output of the preselector circuits. The wave trap provides a low impedance path to ground for signals at or near the 9 MHz IF of the Receiver. The noise generator consists of the base-emitter junction of and pushbutton switch Sl.
Page 32 lator input is also connected in a push-pull configuration control ling current deflection of each pair of deflecting electrodes. Thus, the local oscillator and noise components are suppressed approximately 30 db at the output of Tl. Optimum balance is provided by proper adjustment of Rl. (Refer to Section V for ad...
Page 33 The CRYSTAL selector switch has an extra position (R) which selects a signal from an external oscillator or frequency synthe sizer via a rear panel connector. A companion synthesizer unit, the Model 1550, is available from FEC and is designed to operate with the Model 1500B.
Page 34 Z3 is essentially a differential pair with a third tran- The current source is sistor used as a constant current source. modulated by the 9 �lliz IF signal, while the division of this current in the different ial pair is controlled by the selected Pierce os cillator input signal.
Page 35 3kHz selector switch applies bias at pins This bias either enables a path thru the filter or a path around the filter (3 kHz ) . When the 1kHz position is selected a +1 2 vdc is applied at pin and a - 1 2 vdc is applied at pin This action opens the path thru CR9 to the filter and from the filter thru CRll.
Page 36 The 2. 5 kHz audio signal at the collector of Ql is coupled thru Tl to the bases of active detector Q2-Q3. The resultant rectified negative-going detector pulses are routed thru AGC switch S3 to the base of Q4. If RF GAIN control R4 is set at min negative voltage is coupled through imum gain (maximum negative),...
Page 37 AM Operation. During AM operation, the AGC level is 4.2.10.2 derived from the negative de output from AM amplifier Z5, via CR7 from pi n A. The signal is applied to Q4 at pin M, and develops an average de level in the same manner that the FSK AGC level is In the AM mode it is required that the operator place derived.
Page 38: Alignment
SECTION V ALIGNMENT GENERAL The Model 1500B Receiver has been carefully aligned at FEC by trained personnel using precision test equipment. Alignment will be necessary only if the Receiver has been tampered with or com ponent parts have been replaced in the mixer and/or IF section(s). Before attempting any alignment of a malfunctioning Receiver, always investigate and eliminate all other possible causes of the malfunction.
Page 39: Bfo Oscillator Adjustment
5 .3 I NITIAL CO NTROL SETTI NGS Initial settings of all front panel controls are listed be low. Unless otherwise stated, these settings should be maintained throughout the alignment procedures. POWER switch ..O N OUTPUT LEVEL control .
Page 40: I 5.5 If Alignment
Adjust C40 for a 900 2.500 k H z ±1Hz reading on Counter. Set BAND switch to D and connect Counter to TP3. Adjust C4 2 for a 8997.500 k H z ±1 Hz reading on Counter. Disconnect Counter and restore controls to initial set tings.
Page 42 7-5.) AM AGC LEVEL ADJUSTMENT (Refer to Figure The AM AGC level adjustment does not need to be adjusted for p roper alignment of the Receiver; but, it should be checked periodically for optimum operation. Set AM-SSB switch to AM. Connect Voltmeter to TPl on 76 7.
Page 43: Local Oscillator Adjustment
LOCAL OSCILLATOR ADJUSTMENT (Refer to Figure 7-4. ) The local oscillator crystal adjustment is not necessary for proper alignment of the Receiver. The oscillator can be set up with this procedure when the exact local oscillator frequency is desired or it can be set up to match the actual input signal as described in paragraph 3.
Page 45: Schematic Diagrams
·-- J6-l SI-E NOISE CIRCVITS GEN. ??o.n. t.!V £ C\ 1. ?.t5's ?.85(1"' lOOK .3?U/.I � - ---- � r- - 1.81.1!1 1.8Url v� SI-C - � �<:' .JOOPF � Ja.J :?-?50Pr Ja-'' ot. I S/- -4 .., # � , JACK LC�->�5 470..12...
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Page 48 SPEAI(ER Till rnlz)- - JZ I - 9 1 T Y 1 TBI-Z,GNO. � �.'tc: ll�Z 00<>. Ill �< MONITOR ON FRONT P•NEL SIGNAL IN �bt � AM INPI.IT DEMO��LAT DR (oN t5oo8} RGoC JZI-11 T&l-4 �� DEMODULATOR POWER AMPLIFI£R �...
Page 50: Wiring Diagram
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Page 65: Crystal Frequency
APPENDIX A SPECIAL APPLICATION DATA GENERAL This Appendi x contains useful application data for o perating the 1 500B Receiver in communication systems utilizing various transmission modes. DEFINITIONS Definitions of the terms used in the following examples are listed b elow: Carrier frequency of transmitter or exciter (herein called exciter) as indicated by the...
Page 66 CW OPERA T I ON 1kHz E x citer 1500 B Filter I n CW B a ndwidth 1 kHz Envelope-+ Mode Mode SS B (Al) (Al) f(l500 B ) f(l500 B) FREQUENCY OF CRYST A L (f x ) Bands A thru C and f(l500 B ) +9.0 MHz f c +9.0 MHz...
Page 67 A.4.1 METHOD 1 E xc iter 1kHz 1500B Filter In F SK Bandwidth 1 kHz Mode +850Hz+ Envelope +850Hz+ Mode (Fl) (Fl) f(l500B) f(1500B) FREQUENCY OF CRYSTAL ( fx) Bands A thru C and L: f (l500B)+9.0 MHz fc+9. 0 MHz Bands and E: f(l500B)-9.0 MHz...
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